SHOP MANUAL

MASSEY-HARRISPONY

fOfher mode/s hegîn on page MH-40)IDENTIFICATION

Tracter sériai number is located on plate on right side of front frame,above front axle.

Engine sériai number is located on left side of cylinder block.BUILT IN THESE VERSIONS

Adjustable Axle—Sériai Nos. PGA 1001 & Up.Standard Axle—Sériai Nos. PGS 1001 & Up.

Massey-Harris "Pony"

I N D E X (By Starting Paragraphs)BELT PULLEY

BRAKES

CARBURETOR

CLUTCH

COOLING SYSTEM

Fan

Radiator

.64

.61

.31

.41

.35

.36

DIFFERENTIAL 54

ENGINE

Cam followers

Camshaft

Connecting rods & bearings.

Crankshaft

Cylinder head

Flywheel

Ignition timing

Main bearings

Oil pump

Oil pressure

.15

.20

.24

.25

.11

.27

.38

.25

.29

.30

ENGINE CONT.

Oil seal (front) 18

Oil seal (rear) 26

Piston rings 23

Piston pins 24

Piston & rod removal 21

Timing gears 19

Valves 12

Valve guides & springs 14

Valve seats 13

Valve timing 17

FINAL DRIVE

Axle shafts 59

Bull gears 59

Bull pinions 60

FRONT SYSTEM

Axle main member 1

Steering knuckles 4

Steering linkage 2

GOVERNOR

Adjust . . ,

Overhaul .

POWER LIFT

Adjustment

Control valve

Cylinder

Pump

Trouble shooting .

POWER TAKE-OFF

REAR AXLE

STEERING GEAR

Adjustment . . .

Overhaul

TRANSMISSION

Bevel pinion shaft

Input shaft

Reverse idler

Shifter rails

.32

.34

.70

.71

.71

.73

.72

.65

.59

. 5

. 9

.51

.52

.53

.48

MASSEY-HARRIS PONY Service Data

CONDENSED SERVICE DATAMassey-Harris Pony

Engine MakeEngine ModelCylindersBore—InchesStroke—InchesDisplacement—Cubic InchesCompression Pressure at Cranking Speed.

GENERAL. Continental........ N62.......... 4........ 2%

..6290-110

Compression RatioPistons Removed From: . .Main Bearings, Number of.Main Bearings, AdjustableRod Bearings, Adjustable .Cylinder SleevesForward SpeedsGenerator & Starter Make. . .

....6.46:1. . , . Below

2No

, No. . . . None

3. Auto-Lite

TUNE UPFiring OrderValve Tappet GapValve Seat AngleIgnition Distributor Make ..Ignition Distributor Model .Breaker GapRetarded Timing, Deg.Full Advance Timing, Deg.Mark Indication:

Retarded TimingFull Advance Timing

. .1 ,3 ,4 ,2

.. . .012C45°

.Auto LiteI.A.D.0.020

TC10

.Paint, TC. . . . None

Mark LocationSpark Plug Make . . . . . .

ModelElectrode Gap

Carburetor MakeModelFloat Setting

Engine Low Idle rpm. . .Engine High Idle rpm. .Engine Loaded rpm . . .Belt Pulley Loaded rpm.PTO Loaded rpm . . " . . .

. . Flywheel. Champion

8 Corn.0.025

M-STSV

1A500

205018001990540

Crankshaft Journal DiameterCrankpin DiameterCamshaft Journal Diameter, Front & Center.Camshaft Journal Diameter, RearPiston Pin DiameterValve Stem DiameterCompression Ring WidthOil Ring WidthMain Bearings, Diameter Clearance

SIZES-CAPACITIES-CLEARANCES(Clearances in thousandths)

1.9995..1.4995. . .1.746. . .1 .246, .0.5434.. .5/16. . .3 /32.. .3/16.1.5-2.0

Rod Bearings, Diameter Clearance. .Piston Skirt ClearanceCrankshaft End PlayCamshaft Bearing ClearanceCooling System—GallonsCrankcase Oil—QuartsTransmission & Differential—QuartsFinal Drive, Each—QuartsAdd for BP and PTO—QuartsFuel Tank—Gallons

.1.5-2.0

....1.5

. . . . 3-7..3-4.5.1 4/5

4.3 3/5.1 1/2. . .3/4.6 4/5

1. Adjustable front axle2. Tractor front frame

F/g. MH1— Left s/de view of /Massey-Harr/s Pony Tractor3. Torque tube & clutch housing 5. Frame side angle4. Frame cross angle 6. Transmission-differential

7. Final drive housing8. Wheel axle shaft

Paragraphs 1-9

FRONT AXLE

MASSEY-HARRIS PONY

AXLE MAIN MEMEER

1. On standard or non-aajustableaxle, to renew thé main member, jackup imder torque tube and removesteering arms and Woodruff keys fromupper ends of knuckles. Remove eachknuckle, hub and wheel as a singleunit. Remove cotter key from radiusrod pivot boit (at rear end of radiusrod) and unscrew pivot boit. Removecotter key from axle main memberpivot pin and drive pin out rearward.

For removal of main member of ad-justable axle, each outer extensionarm, knuckle, hub and wheel may beremoved as a single unit.

STEERING LINKAGE

Non-Adgustable Axle

2. A non-adjustable drag link withintégral socket ends is used and at-taches to left steering knuckle arm.The single tie-rod has adjustablesocket ends for obtaining correct toe-in of front wheels, which should be %inch.

Fig. MH2-Pony ad-justable front axle

and linkage.

1. Steering arms2. Tie rods3. Bellcrank4. Main member5. Drag link6. Extension clamp7. Steering knuckle8. Felt oil seal

Adjustable Axle3. A non-adjustable drag link with

intégral socket ends attaches to bellcrank (3-Fig. MH2) which pivots ona shouldered boit in front frame (orsupport to engine). Two tie-rods (2)with adjustable socket ends attach tothé bellcrank and to steering knucklearms(l). Correct toe-in of % inch isobtained by adjusting thé tie-rods attheir inner ends. Outer ends of tie-rodsextend to coordinate with main mem-ber extension arms.

STEERING KNUCKLES

4. REBUSH. Jack up under axle andremove each wheel and hub as a unit.Remove steering arms and Woodruffkeys from upper ends of steeringknuckles and withdraw knuckles fromaxle. Drive thé worn bushings out ofaxle main member (or extension armin thé case of adjustable axles) andinstall new bushings. Ream or honebushings to allow I&T recommendedclearance of .002-.004. Diameter ofnew steering knuckle journal is 1.125inches.

5. ADJUSTMENT. Adjustment ofRoss cam and lever steering on théPony tractor is done with thé rightside panel removed as in Fig. MHS.Ail adjustments are made with frontwheels raised or with drag link dis-connected to relieve load on steeringmechanism.

6. CAM SHAFT. To adjust cam orsteering shaft bearings, loosen steer-ing column clamp (1) and remove théthree cap screws (3). Note that oneof thèse cap screws has a copper wash-er under its head; replace in sameposition. Raise cover and separate oneshim (4) from pack; split shim andremove it. Replace cover and capscrews and test for end play of bear-ings. Ail end play should be removed,but there should be no drag on steer-ing gear except through its mid-posi-tion and then only when lever shaft isin correct (zéro backlash) adjustment.

7. LEVER SHAFT. Loosen lock nuton lever shaft screw (6) and turn screwin until slight drag is felt when steer-ing wheel is turned through its mid-

STEERING GEARposition (front wheels raised).

8. PITMAN ARM. To synchronizesteering gear to front wheels whenreinstalling pitman arm on cam levershaft, first place front wheels in theirstraight ahead position; turn steeringwheel through its full range and countthé complète number of turns, thenturn back exactly halfway so that gearis in its mid-position (that is, camlever stud is on high point of cam).Now, install pitman arm and drag linkwithout disturbing position of steer-ing gear or front wheels.

9. OVERHAUL. To remove Rosssteering gear unit for overhaul, it isnecessary to pull pitman arm or dis-connect drag link, remove both sidepanels and top panel (through whichsteering column protrudes) and dis-connect throttle - to - governor rod.Throttle quadrant assembly can beremoved from gear unit after unit isremoved from tractor.

Renew ail worn parts in unit. Thetwo lever shaft bushings should behoned to provide .002-.003 clearance

for lever shaft. Adjust unit after reas-sembly.

F/0. MHS—Pony steering gear adjustment.1. Steering column 4. Bearing adjusting

clamp shims2. Clamp boit 5. Housing side cover3. Housing cover cap 6. Lever shaft adjust-

screws ing screw

MASSEY-HARRIS PONY Paragraphs 10-14

ENGINE AND COMPONENTSR&R ENGINE WITH CLUTCH

10. To remove engine and clutchunit, remove hood, grille and radiator.Disconnect choke wire at carburetorand fuel line at shut-off valve andgovernor spring at governor levershaft; remove forward manifold studnut and lift governor rod support offstud. Disconnect oil gage line fromoutlet at right side rear of cylinderblock. Disconnect electrical harness,namely battery and field connectionsat generator cutout relay and ignitionwire at coil. If tractor is equipped withlights, disconnect from wire harness.On models equipped with hydrauliclift, disconnect or remove hydrauliclines from pump. Support engine in ahoist and remove engine-to-frontframe bolts and engine-to-torque tubebolts. Lift engine and clutch forwardand out of front frame and torque tube.

Reinstall engine in reverse manner,rocking slightly to guide clutch shaftinto driven member and pilot bearing.

CYLINDER HEAD11. Removal of cylinder head re-

quires removal of hood and drainingcooling system. On hydraulic lift mod-els, remove hydraulic pump and réser-voir unit. The air cleaner-to-carbure-tor tube must be removed and whencylinder head cap screws are takenout, thé air cleaner is taken of¥ andcoil, ignition harness and oil filteris laid back out of way. When rein-stalling head, use thé proper lengthcap screws in each hole and tightencap screws evenly from center out-ward, applying thé correct torque of37.5-42.5 foot pounds.

VALVES12. Exh. valves in this engine hâve

Roto caps on their stem ends (Fig.MH4) to provide a rotating motioneach time valve is lifted. This causesa wiping action between valve faceand its seat and permits longer valvelife. To remove valves, remove hood,cylinder head, carburetor, distributorand valve chamber cover. Stuff smallbits of cloth in oil return holes invalve chamber to prevent droppingvalve spring keepers into crankcase.Compress valve springs and removekeepers (exhaust valves hâve splithalf-moon keepers and inlet valveshâve pins). Lift valves out of guidesand springs; take retainer seats andRoto caps out of chamber. Renewvalves if stem diameter is less thanthé values given below.Exhaust stem diameter 3124Inlet stem diameter 3141Valve seat angle (in b lock) . . . . 45°

Exhaust face angle 44°Intake face angle 45°

Refer to Standard Units Section forvalve rotator maintenance.

VALVE SEATS AND INSERTS13. Valve seats should be refinished

to 45 degree angle and thé widthshould be reduced to ^ inch. Valveseat inserts are supplied for service.Chili insert in kérosène and dry icethen measure outside diameter ofsame. To install inserts, counterborecylinder block to same diameter aschilled insert and install same witha suitable arbor. Peen block near rimof seat recess to lock insert in place.Rennish insert seat to 45 degree angleand -£% inch width.

VALVE GUIDES AND SPRINGS14. Guides in this model are straight

with no shoulder. When valves areout, guides can be driven downwardinto valve chamber with a suitablearbor. Top of each guide should beff inch below gasket surface of cylin-der block. Ream guides, after installa-tion, to provide stem-to-guide clear-ance of .0035 inch for exhaust valvesand .0018 inch for inlet valves. The ad-ditional clearance required for thé ex-haust valve is provided for on exhaustvalve stem, hence thé same reamermay be used in both exhaust and in-let guides.

Test valve springs and renew anywhich do not test 15 pounds plus orminus 2 pounds when compressed to1% inches, or which are rusted, dis-torted or do not hâve protective coat-ing. Valve spring free length is 1-ffinches.

F/g. MH4—Contin-

ental N 62 ex»

haust and inlet

valves. Valve ro»

fafors are u s e d

on exhaust valves

only.

1. Valve spring2. Exhaust valve3. Spring retainer4. Split cône locks5. Roto cap6. Inlet valve7. Pin type lock8. Tappet screw9. Lock nut

10. Tappet barrel

F/g. MH5—Adjusting tappefs on Continental N62 engine. A three wrench opération.

Paragraphs 15-19 MASSEY-HARRIS PONY

Fig. MH6—Continental N62 timing gearsand valve timing marks. Oversize mark-ing on cam gear corresponds with 7 -j-

mark on gear case gasket surface.

VALVE TAPPETS(CAM FOLIOWERS)

15. The barrel type tappets can berenewed without disturbing thé cam-shaft or cylinder head by first remov-ing thé valve chamber cover, screw-ing thé tappet adjusting screw com-pletely down and removing thé valvespring. While holding thé valve up,remove tappet screw and lock nutfrom barrel and lift thé barrel out ofits bore. Oversize tappets are not pro-vided for service. I&T recommendedclearance of tappet in its bore shouldnot exceed .0025 for quiet opération.

Note: If ail valve tappets are to beremoved, it is recommended that thécylinder head and valves be removed.

16. ADJUST. Adjustment of tapperclearance is a three-wrench opération(Fig. MHS). Recommended gap is .012cold for inlet and exhaust. To ad-

just ail of thé tappets it will be neces-sary to remove carburetor, distrib-utor and valve chamber cover. Ifonly one or two tappets near thé rearof block are to be adjusted, thé dis-tributor need not be removed. Adjusttappets for number one cylinder whennumber four piston is at top center ofits compression stroke; adjust numberthree when number two piston is ontop center of its compression strokeand proceed in thé same manner forail cylinders through thé firing order(1-3-4-2).

VALVE TIMING17. To check thé timing when en-

girie is assembled, set exhaust valvetappet of number 1 or 4 cylinder to.020 clearance. Crank engine until thépiston of cylinder being checked (1 or4) is coming up on its compressionstroke and continue to crank slcwlyuntil exhaust valve closes and tappetcan be rotated with thé fingers. At thispoint, thé painted mark on flywheel(indicating top center) should alignwith. thé timing pointer when viewedthrough timing inspection hole inright side of engine or within 4 de-grees or ̂ inch either way.

If valves are incorrectly timed, re-move timing gear cover and inspectrelation of timing marks on camshaftgear and crankshaft gear. The punchmarked tooth of crankshaft gear ismeshed between thé two punchmarked teeth of camshaft gear.

TIMING GEARS AND COVER18. TIMING GEAR COVER. To

check timing gears (without removalof same), to renew crankshaft front oilseal or to remove and reinstall gover-nor assembly for overhaul, thé timinggear cover can be removed withoutdraining and removing radiator on

Fig. MHZ—Puf/ing Continental N62 cam gear. Note washer foefween camshaff and pu//erscrew fo profecf governor p/unger bore. Tappets are he/d up by vv/re under heads of

fappef screws.

models not equipped with hydrauliclift. However, on models equipped withhydraulic lift, it will be necessary toremove radiator. First, remove hood.grille and crank support. Take offfan belt and fan assembly; removestarting jaw nut and pull thé crank-shaft pulley. Disconnect governor link-age and remove cap screws and nutsattaching cover to engine and oilpan. Loosen ail other oil pan capscrews and insert a thin knife bladeor feeler between oil pan gasket andtiming gear cover and separate thétwo. Pry cover ofî its dowels andstuds. Timing gears may now be in-spected; governor weights assemblycan be removed from camshaft gearand governor lever shaft and asso-ciated parts in thé cover can be in-spected or repaired as required; crank-shaft front oil seal (a spring loadedleather seal with lip facing inward)can be pressed out of cover and re-newed.

19. TIMING GEARS. If thé gears areto be removed, camshaft removed orcrankshaft end play adjusted, théradiator must be drained and removedin addition to thé work performed inthé preceding paragraph. As will benoted in Fig. MH6, thé timing gearsare meshed so that thé punch markedtooth of crankshaft gear is betweenthé two punch marked teeth of cam-shaft gear.

To remove camshaft gear, take outthé four machine screws fasteninggovernor weights assembly to thégear. Remove weights assembly andcamshaft gear nut. To remove gearwithout using a puller, rotate cam-shaft until thé two % inch holes ingear hub are in register over shaftthrust plate retaining screws. Inserttwo %-16 screws having ll/2 inchthreaded portion into gear hub holesand turn them in evenly until gear ispushed off shaft. An alternate way isto use puller as shown in Fig. MH7,being careful that governor plungerbore in camshaft is not damaged bycenter leg (screw) of puller.

To remove crankshaft gear whencover is off, it will be necessary touse a suitable puller.

Note markings (Fig. MH6) ongear cover gasket surface of crank-case. This indicates correct oversizeor undersize gear to be used in thisblock. In this instance, it indicatesthat camshaft gear one size overstandard should be used. The gearwill be similarly marked on its for-ward face.

When installing thé camshaft gear,it is advisable to remove distributoror oil pan and buck up thé shaft.

MASSEY-HARRIS PONY Paragraphs 20-25

CAMSHAFT20. To remove camshaft, remove

timing gear cover. radiator and cam-shaft gear. Remove cylinder head andblock up valves. Raise tappets andhold them up with wire placed underheads of tappet screws. Remove thrustplate and thé camshaft from its bores.

Camshaft has three bearing jour-nals which rotate in bores eut in thécylinder block; no bushings being usedor supplied for service. A bore in rearof camshaft carries thé slotted oilpump drive shaft. A pin is rivetedin thé camshaft and passes throughthis rear bore, thé slotted end of oilpump drive shaft engages this pin andis driven by it. A bore in thé forwardend of camshaft receives thé governorplunger (cup and shaft assembly) asshown in Fig. MHS. A relief hole isdrilled just aft of front journal torelieve any pressure created by actionof pluriger. This hole should be freeof dirt and sludge. Dimensions of anew camshaft are as follows:Front & center journal: 1.7455-1.7465Rear journal: 1.2455-1.2465Inlet valve lift: 241Exhaust valve lift : 243

Recommended clearance of cam-shaft in thé block bores is .003-.0045.lf thé bearing clearance exceeds .0007,it will be necessary to renew thé cam-shaft and or cylinder block, or tomake up and install bushings. Cam-shaft end play is controlled by athrust plate behind thé camshaft gear,Renew thé thrust plate if thé endplay exceeds .007.

ROD AND PISTON UNITS2l. Connecting rod and piston as-

semblies are removed from below. Thelower end of each cylinder is cham-fered to facilitate installation of pis-tons and rings from below without us-ing a ring compressor. An alternatemethod (providing cylinder head hasbeen removed) is to install rod andpistons from below without thé rings;then push pistons up through boreand out thé top. Install rings on pistonand use a compressor to guide pistonand rings into bore. Rod spurt hole,numbers on side of rod and cap facetowrard camshaft side of engine. Onaluminum pistons, split in skirt îsplaced away from camshaft. TightenConnecting rod cap bolts to 20-25 footpounds.

PISTONS AND CYLINDERS22. Cast Iron pistons were originally

| used in this engine, but présent pro-duction uses aluminum pistons. Pis-tons are available in standard size andoversizes of ,020, .030, .040 & .060. Re-

Fig. MHS-Continental N62 camshaft withgovernor plunger in position. Hole aft offront journal is for relief of vctcuutn orpressure created in governor plunger bore.

move pistons as described in precedingparagraph.

If new rings are to be installed, thécylinder head should be removed andthé unworn ridge at top of cylinderseut out to protect piston rings frombreakage or flutter. Fit of piston incylinder is checked with V2 inch widefeeler placed between piston skirt andcylinder wall at right angle to thépiston pin (thrust side of piston skirt)as shown in Fig. MH9. A pull of 5-10pounds should be required to pull a.0015 thick feeler from between pistonand cylinder wall.

PISTON RINGS23. Measure gap of rings in worn

cylinder at lowest (unworn) portionof cylinder. Correct gap is .007-.012for ail rings. Check side clearance ofrings in their grooves (after carbonis removed), Clearance for compres-sion rings is .0015-.0035 and for oilcontrol rings is .001-.0025. Piston ringsof .020, .030, .040 & .060 oversize are

available. Taper compression rings areinstalled with thé side marked "Top"facing up.

CONNECTING RODS AND BEAR-INGS, PISTON PINS AND

BUSHINGS24. Précision insert type conn. rod

bearings can be renewed after removalof thé oil pan. Desired clearance ofbearing on thé crankpin is .0015-.002.Undersize inserts of .002, .020 and .040are available. Check rod for side playon crankpin (.006-.010) and if insuffi-cient investigate for a mis-alignedrod, or burrs on side of rod or crank-pin journal.

Piston pins are solid type, full flaat-ing and retained in piston bosses byspring steel lock rings. An applicationof heat to thé piston or submergingpiston in hot oil or water will facili-tate removal and reinstallation of pin.Use new lock rings whenever old oneshâve been disturbed. If oversize pins(.003, .005 or .010) or new bushingsare to be installed, fit them by reamingor honing. The .5433-.5435 diameterpiston pin should be a light push fitin piston and should hâve .0003 clear-ance in thé rod bushing. Align con-necting rods whenever new pins orbushings are installed.

CRANKSHAFT AND MAINBEARINGS

25. Crankshaft is mounted in twoprécision, insert type bearings whichmay be renewed without removing

Fig. MH9—Fitting Continental N62 piston. Use Y2 inch wide feeler, ,0075 thick. Correctfit requ/res 5- ÏO pounds pull.

Paragraphs 25-30

Fig. MHIQ—Adjusting crankshaft end playon Continental N62. Shims (4) are variedto obtain .003-.007 end play. Locatebronze washer (3) on dowels (5) beforedriving thrust plate (2) and crank gear (1)

in position,

crankshaft or engine. Desired clear-ance of crankshaft in thèse bearings is.0015-.002 inch. Crankshaft journalssizes and wear limits are as follows:

Mains journal diameter. . . .1.999-2.000Main bearing oil clearance. .0015-.002Repair if clearance exceeds 0032Crankpin diameter 1.499-1.500Renew or regrind shaft if

journals or pins out-of-round more than 003

Main bearing cap nuttorque 92.5-97.5 ft. Ib.

Undersize bearings of .002, .020 and.040 are available for service.

Crankshaft end play of .003-.007 iscontrolled by shims between thrustplate (2-Fig. MH10) and front journalof crankshaft. To reduce end play, re-rnove timing gear cover and camshaftgear. Pry ofï thé crankshaft gear (1),thrust plate (2) and remove shims(4) as necessary to reduce end play.Shims are .002 and .008 thick. To re-check end play with timing gear coverofï, thé crankshaft pulley must be inplace and thé starting jaw nut tight-ened. Be sure thé punch marked toothof crankshaft gear is meshed betweenthé two punch marked teeth of cam-shaft gear when reassembling.

CRANKSHAFT REAR OBI SEAL26. Crankshaft rear seal is a spring-

loaded type, pressed into a retainerwhich is fastened to thé rear of cyl-inder block as shown in Fig. MH11.

Renewal of seal requires splitting thétractor as described in Clutch sectionand removal of clutch and flywheel.When removing seal retainer, use athin knife blade or feeler to separateoil pan gasket from thé retainer. Pressnew seal in retainer so that lip willface towards inside of engine. Installseal carefully using oil to lubricate lipand make guide sleeve to guide it overcrankshaft flange,

FLYWHEEL27. Flywheel may be removed after

tractor is split and thé clutch removedas described in Clutch section. Thereis no need to mark relative position offlywheel to crankshaft flange as it canbe installed in one position only. Fly-wheel run-out should not exceed .004at rear face. Flywheel ring gear is re-newable and should be shrunk on fly-wheel with bevel of teeth towards thérear for easy engagement of starterpinion gear.

OIL PAN28. The sheet métal pan is fastened

to crankcase by cap screws. Removalof pan is complicated in early produc-tion models by thé front axle pivotpin and tractor must be blocked upunder forward end of torque tube andpivot pin removed before pan can belowered. When reinstalling pan, takecare when inserting thé rear cap

MASSEY-HARRIS PONY

sereins as it is possible to drop thèseinto flywheel housing and their re-moval jrom this compartiment is dif-ficult and may ' sometimes requiresplitting tractor at this point.

OIL PUMP29. Pump is located on thé rear ma-

chined surface of cylinder block asshown in Fig. MH11. Pump is drivenby thé camshaft. Removal of thé pumprequires splitting thé tractor as out-lined in Clutch section and removal offlywheel. A 0.007 thick lead gasket (8)is located between pump body (9) andcover plate (5). Between cover plateand engine is another gasket made ofvellumoid. Idler gear shaft (10) is apress fit in thé body; diameter of newidler shaft is .501. The body bore fordrive gear and shaft assembly (7) cou-tains bronze bushing (11); if bushingis worn it is recommended that newpump body with bushing be installed,Diameter of new drive gear shaft is.4985. Thickness of new drive gear oridler gear is .3735. Check pump forgear backlash which should not ex-ceed 0.005. Gear to pump body sideclearance should not exceed 0.004.

OÏL PRESSURE RELIEF VALVE30. The valve assembly is located in

right side of cylinder block. Valve isspring loaded, plunger type, maintain-ing oil pressure of 20-30 pounds at op-

Fig. MHTI—Continental N62 oil pump cissemhly and crankshaft rear oil seal. Repairson thèse units require removal of cfufcfi and flywheel.

1. Oil seal retainer 5. Pump cover & gasket 8. Body-to-cover gasket2. Oil seal 6. Idler (driven) gear 9. Oil pump body3. Crankshaft flaîige 7. Driving gear & shaft 10. Idler gear shaft4. Clutch shaft pilot bushing 11. Drive shaft bushing

8

MASSEY-HARRIS PONY

erating speed. Two types of reliefvalves hâve been used in thé Ponytractor. In engines up to sériai num-ber 6138, a bullet nose plunger, M-Hpart number 1500066M1 is used; en-gines with sériai number 6138 and upcontain thé cylinder type plunger,M-H part number 15322A. Relief valvespring, M-H part number 21195A(painted red) should be used to ob-tain correct oil pressure setting.

CARBURETOR31. Marvel-Schebler updraft carbu-

retor model TSV16 or model TSV24 isused. Adjustments on thé TSV carbu-retor are limited to idling speed andidling mixture adjustments. Bothshould be performed when engine iswarmed to operating température.Idling speed is 500 rpm. Float settingis 1A inch and is measured from near-est face of float to gasket surface ofbowl cover. Refer to Standard UnitsSection for additional data.

GOVERNOR32. SPEED ADJUSTMENT. To ad-

just maximum no-load governed speed,remove right side panel which exposeslower portion of throttle quadrant as-sembly as shown in Fig. MH12. Changethé governor spring tension by turn-ing bail and socket joint (S) on gov-ernor rod until desired speed is ob-tained. If engine surges at no-loadspeed, turn in on bumper screw (D)unti] surge is eliminated (this willcause slight increase in no-load speed).Correct governed speeds follow:

Crankshaft rpm (Load) 1800(No Load) 2050

Belt Pulley rpm (Load) 1990(No Load) 2266

Power Take-Off rpm (Load) 540(No Load) 615

Paragraphs 30-36

33. LINKAGE ADJUSTMENT. Tocheck or set ail linkage, first adjustcarbureior-to-governor rod (R) sothat there is ̂ inch clearance betweenthrottle lever and its wide open stopat (G) when governor lever is in wideopen position. Turn bumper screw (D)out so it is inoperative. Check to seethat ail linkage opérâtes freely; thenstart engine and warm to operatingtempérature; then adjust as outlinedin preceding paragraph.

34. OVERHAUL G O V E R N O R . Toremove governor, first remove timinggear cover as outlined under TIMINGGEAR COVER section. Fig. MH13shows position of weights and carrier,plunger and shaft in thé camshaftgear. Fig. MH14 shows governor levershaft and bumper spring and screwin timing gear cover. Inspect weightsand pins for wear; also check weightsfor amount of wear on their plunger-contacting surface. Inspect plungerfor wear on its shaft and also onweight-contacting surface of its cup.If lever shaft bearing iri timing gearcover is worn, remove thé rivet whichattaches arm (1-—Fig MH14) to levershaft, take out cotter pin (2) and pulllever shaft from cover. Note that asteel bail is located in lower bore ofcover; bottom of lever shaft rests onthis bail. The worn bearing may bedriven out of upper bore in cover andrenewed. Renew thé felt seal also. Ifbumper spring (5—Fig. MH14) is loosein cover, rerivet it in place.

If a newly overhauled governor doesnot operate properly, check for aplugged pressure relief hole in thécamshaft. Refer to paragraph 20.

COOLING SYSTEMFAN ASSEMBLY

35. Adjust fan belt to thé correcttension by moving thé generator on

D. Bumper screwG. Throttle lever stopR. Carburetor to governor rodS. Bail and socket joint

F/g. A1H73—Fony timing gears, sfiowingposition of governor weights and carrier,

attachée! fo camshaft gear.

its adjusting strap. Fan assembly canbe removed from tractor after hoodand fan belt hâve been taken ofï. Ra-diator need not be disturbed on modelswithout hydraulic lift. Parts for serv-icing thé fan assembly are not supplied;thé complète unit is renewed if repairsare required.

RADIATOR

36. Tanks & core of radiator assem-bly are not détachable. Radiator ismounted to thé tractor by two supports(formerly a one-piece unit) which arefastened to each side of radiator. Onlater Pony models, a pressure type capis used. Radiator may be removed af-ter hood and grille hâve been taken off.

Fig. MH14—Pony governor lever shaft as-semhly in timing gear cover.

Fig. MH 12—Pony governor linkage assembly.1. Arm 3. Control lever2. Cotter pin

4. Bumper screw5. Bumper spring

Paragraphs 37-43 MASSEY-HARRIS PONY

IGNITION SYSTEM37. Three models of Auto-Lite dis-

tributors are used on Pony tractors;IAD 4028A, IAD 60032A or IAD 600-32G. The distributor is mounted onright side of engine. Condenser is lo-cated within thé distributor. Breakerpoint gap is .020. For overhaul andtesting procédure refer to StandardUnits section.

38. IGNITION TIMING. To time ig-nition with distributor installed, crankengine until number one piston iscoming up on compression and con-tinue to crank slowly until paintedmark on flywheel (Fig. MH15) alignswith timing pointer when viewedthrough inspection opening on rightside of engine; number one piston isnow at top center of its compressionstroke. Turn ignition switch on androtate distributor a few degrees clock-wise; hold number one spark plugwire close to head or grounded pointand very slowly rotate distributorbody counter-clockwise until a sparkoccurs at end of plug wire; lock dis-tributor in position. To recheck igni-tion with timing light, operate engineat idle speed (do not operate above 600rpm, as automatic advance starts atthis speed) and make check with tim-ing light connected in séries witheither number one or number fourspark plug wire. If timing is correct,thé light will flash at thé same instantthat painted mark on flywheel alignswith timing pointer. If thé two do notalign as light flashes, rotate distribu-tor body until proper register is ob-tained.

ELECTRICALSYSTEMGENERATOR

39. Third brush generator, Auto-Litemodel GBM4804A5 is accessible with-out disturbing any other tractor parts.Generator output is manually con-trolled by thé light switch. The switchhas three positions. Position numberone (button fully in) inserts a résist-ance into generator field circuit to re-duce generator output to about threeampères; position number two (but-ton half-way out) removes thé résist-ance from generator field circuit and

TC

CLUTCH41. ADJUST. To adjust thé clutch

pedal travel, refer tô Fig. MH16 andadjust yoke (Y) on rod (R) until clutchpedal has a free travel of approxi-mately one inch.

F/g. MH15—Distributor timing mark is in-dicated on flywheel face by painted

mark TC as shown.

permits maximum generator output tocharge a low battery; position num-ber three (button fully out) closes thélights circuit and also removes thé ré-sistance from generator field circuitpermitting maximum generator outputto compensate for thé current draw ofthé lights. Maximum generator outputis controlled by thé generator thirdbrush. For testing and repair informa-tion on thé generator and its cut-outrelay (Auto-Lite CB4014) refer toStandard Units section.

STARTING MOTOR

40. Auto-Lite starting motor, modelMZ4146A is mounted on left side oftorque tube and its pinion engagesflywheel ring gear from thé rear. Toremove starting motor, first take offthé left side panel, loosen battery hold-down bolts and lift battery up andback against steering gear housing;this will allow sufficient room to re-move starting motor from torque tube.Caution: Mounting flange of startingmotor is greater in area than mount-ing pad machined on torque tube, thuswhen starting motor is fastened in po-sition there will be about -^ inch spacebetween torque tube and starting mo-tor flange ears. Do not draw mountingbolts too tight as thèse flange earsmight break off. Repair and test datafor this unit are covered in StandardUnits section.

F/g. MH 7 6—Pony clutch pedal adjustment.Turn yoke (Y) on rod (R) until pedal has

one inch free travel.

42. TRACTOR SPLIT FOR CLUTCHR & R. As shown in Fig. MH17, clutchcan be removed from flywheel aftertorque tube is split from engine andfront frame. To perform this split,remove hood, detach drag link eitherat its front or rear joint, disconnectwire harness from generator, ignitioncoil and lights (if so equipped), dis-connect oil gage line at right side ofengine, choke wire at carburetor,governor spring at governor lever shaftand remove governor rod clip fromunder manifold front stud nut. Shutoff fuel supply at tank and disconnectfuel line at carburetor. Disconnecthydraulic pump to cylinder lines onmodels so equipped. Hang engine(forward) naïf of tractor in hoist ina manner similar to that shown inillustration. Block up rear half oftractor by installing a rolling floorjack under torque tube. Remove frontaxle radius rod pivot boit (P) fromtorque tube and take out bolts andcap screws which attach torque tubeto engine and front frame. Separatetractor halves enough to permit re-moval of clutch from flywheel.

43. R & R CLUTCH. Clutch can beremoved after tractor is split as inpreceding paragrapli 42 or when en-gine is out. When removing or re-installing clutch on flywheel (Fig.MH18), turn alternate cover-to-fly-wheel cap screws evenly to preventdistortion of thé clutch cover. Use a

10

MASSEY-HARRIS PONY Paragraphs 43-46

Fig. MH17—Splitting Pony fracfor for clutch rernoval. Note method of suppôt ting eng/fieand fronf frame. A floor /ack (nof shown) supports rear portion of fracfor. (P) is front

axle radios rcd p/vof boit.

spare clutch shaft or dummy tool tocenter thé driven plate on flywheeiwhen reinstalling clutch. When re-assembling tractor, hand crank engineso that splines of driven plate engagesplines of clutch shaft. Place trans-mission in gear so that clutch shaftdoes not turn.

44. OVERHAUL CLUTCH, Theclutch in thé Massey-Harris Ponytractor is a Rockford model 6V2 RM.The clutch cover assembly on earlyproduction models was a Borg-Warnernumber 165-246. The clutch cover as-sembly on late production models is aBorg-Warner number 165320. AU mod-els of thé Pony tractor are fitted with aBorg-Warner number 185005 driven(lined) plate.

Disassembly, reassembly and releaselever setting procédures are coveredin thé Rockford clutch section in théseparate Standard Units Manual. Re-lease lever height is given in clutchtable 5 in thé separate Standard UnitsManual.

45. R & R CLUTCH R E L E A S EBEARING. Release bearing and itscollar are accessible when tractor issplit for clutch removal as explained

|in preceding paragraphs.

The permanently lubricated bearingis pressed on its collar and can be

F/g. AÏHI8—Exp/oded view of Pony clutchcover assembly snow/ng ifs comportent

parfs.R. Release lever 4. Pivot pinS. Adjusting screw 5. Adjusting screw seat1. Driven dise 6. Pressure spring2. Back plate (cover) 7. Pressure plate3. Release lever spring

easily pressed off for renewal. Re-member to attach thé return springto collar when reinstalling.

Whenever clutch is being over-hauled, check contact of clutch releasefork against release bearing collar.Hold collar against fork and, using a0.003 inch feeler, check each side ofcollar to see that thé two tangs of re-lease fork are contacting thé collar.

Bend tangs to obtain correct contact.The bores in thé torque tube where re-lease fork shaft rides are not bushedand no bus'hings are supplied forservice.

46. R & R CLUTCH SHAFT. Re-newal of clutch drive shaft requiressplitting tractor at thé torque tube-to-transrnission joint as shown in Fig.MH19. Proceed as follows: Supportforward portion of tractor by auach-ing hoist to thé angle iron cross bar(frame cross angle) which attachesunder rear of torque tube. Block uprear portion of tractor with a rollingfloor jack. Disconnect brake rods atpedal shaft and remove thé two car-riage bolts which attach frame sideangles to thé frame cross angle. Re-move thé four transmission-to-torquetube bolts and separate tractor at théjoint. As shown in thé illustration,thé splined coupling which is weldedto rear of clutch shaft is fastened totransmission input shaft by cotter pinwhich must be removed to permitwithdrawal of thé clutch shaft.

When reassembling, install clutchshaft in torque tube so that its forwardend is inserted in thé tubular guidefor clutch release bearing collar inforward portion of torque tube. Bringtransmission and final drives assemblyand thé forward portion of tractortogether until transmission input shaftcan be inserted into clutch shaftcoupling, making sure that holes ininput shaft and coupling are alignedto receive thé cotter pin. Insertand spread cotter pin and careful-

F/g. MH79—Splitting Pony tractor at torquetube-to-transmission /'o/nf for removal ofclutch shaft or transmission front seals.Note cotter pin (C) which fastens clutch

shaft to transmission input shaft.

11

Parctgraphs 46-51 MASSEY-HARRIS PONY

ly draw thé two portions of trac-tor together, using hand crank to

turn engine until splines of clutchdriven plate engage splines of clutch

shaft. Place transmission in gear sothat clutch shaft does not turn.

TRANSMISSION AND CONNECTIONS47. The transmission of Pony trac-

tor is carried in a common housingwith thé differential assembly; théunits are separated by a wall in théhousing. Transmission is a three speedunit with reverse and, as shown inFig. MH20, three shafts are used totransmit thé power. Removal of anyone of thé shafts or overhaul of trans-mission requires its removal from thétractor. Shifter rails and forks arecarried in transmission side coverwhich can be removed while trans-mission is in tractor.

48. SHIFT RAILS AND FORKS. Toremove transmission side cover andshifter assembly (Fig. MH21), raisethé dust boot on shift lever, pull outshift lever pin and remove shift leverfrom housing. Cover-to-transmissioncap screws can then be removed andcover taken off housing. Disassemblyand reassembly of thé unit is apparentfrom a study of illustration. Rail (2)for first and reverse fork is fj- inchlong at point (L). Renew forks (1)and (5) if worn on their gear contact-ing surfaces and detent springs (6)if they hâve lost their tension.

49. INPUT SHAFT OÏL SEAL ANDBEVEL PINION SHAFT FRONT CAPGASKET. To renew either thé inputshaft front oil seal or gasket for bevelpinion shaft front cap, split tractorat thé torque tube-to-transmissionjoint as explained under R & RCLUTCH SHAFT. Input shaft oil seal(Fig. MH22) can be pried out of itsseat for renewal. Install seal with lipfacing inward. Gasket under bevelpinion shaft front cap is made ofVellumoid.

50. R & R TRANSMISSION. To re-move unit for overhaul or removal ofany of thé transmission shafts, it isfirst necessary to remove thé finaldrive units and thé differential asoutlined in their respective sections.Remove thé transmission - to - torquetube bolts and pull transmission (withclutch shaft attached) from torquetube. To reinstall transmission-differ-

Fig. MH20—Cutaway of Pony fransm/ss/on, differential and final drives unit. A wall inthé common case séparâtes thé differential from thé transmission. Final drive housings

are détachable from transmission case.

ential housing, thé clutch shaft shouldfirst be installed in torque tube sothat its forward end is inserted in thétubular guide for clutch release bear-ing collar in forward portion of torquetube. Place transmission-differentialhousing on movable floor jack orplatform and wheel into position sothat transmission input shaft can beinserted in clutch shaft coupling, mak-ing sure that holes in input shaft andcoupling align to receive cotter pin.Insert and spread cotter pin and care-fully draw thé transmission and torquetube together using hand crank toturn engine until splines of driven

3 4 5

Fig. MH27—Pony transmission shifter railsand forks in transmission side cover. Firstand reverse fork rail (2) can be identifiée!by m ea su ring length ot section (L) which

is 77/16 inch.

1. First & reverse fork 5. Second & 3rd fork2. First & reverse rail 6. Detent bail & spring3. Guide rail 7. Rail lock4. Second & 3rd rail 8. Interlock pin

member engage splines of clutch shaftHâve transmission in gear so thatclutch shaft does not turn. Boit trans-mission and torque tube together andreinstall differential and final driveunits.

51. BEVEL PINION (SLIDINGGEAR) SHAFT. This shaft (18—FigMH23) may be removed either beforeor after removal of input shaft (following paragraph), but it is recommended that it be removed first so thaïshaft can be locked in two gears aï

Fig MH22—Pony transmission fronf seafs.Input (upper) shaft seal is installed withlip facing inward. Tfie sliding gear (lowershaft is intégral with main bevel pinion

and is sealed by a cap and gasket.

12

MASSEY-HARRIS PONY Paragraphs 51-53

1 2 3 4 5 6 7 9 10 11

20 *. n

»-**•

18 13 12

F/g. MH23—Pony transmission assembly. Shims (B) are for bevef pin/on shaft bearingad/ustment. Shims (G) are for mesh adjustment of main drive bevef gears.

1. Input shaft rear snap ring2. Cup washer3. Rear bearing & snap ring4. First speed gear5. Gear spacer6. Second speed gear7. Third speed gear

8. Input shaft9. Input shaft front snap ring

10. Front bearing & snap ring11. Input shaft oil seal12. Bevel shaft cap & gasket13. Shaft lock nut14. Front bearing assembly

15. Second & 3rd sliding gear16. First & reverse sliding gear17. Rear bearing assembly18. Bevel pinion shaft19. Reverse idler shaft lock20. Reverse idler shaft21. Reverse idler gear

Fig. MH24—Rear view Pony transmissionwit/i differential removed. Note etchedmarkings on rear face of bevel pinionshaft. Identical markings will be fotindon bevel ring gear as thèse are suppfied

in matched sets.1. Snap ring2. Cup washer8. Input shaft

18. Bevel pinion shaft19. Reverse idler lock20. Reverse idler shaft

once until nut (13) can be loosened.With differential and transmission sidecover removed, proceed as follows:Lock thé bevel pinion shaft by mesh-ing both sliding gears at once andremove front cap (12); drive a punchunder staked portion of nut (13) andunscrew nut from bevel pinion shaft.Bump thé shaft rearward înto dif-ferential compartment. Front bearingcône (14) will be released as shaft isbumped rearward; both sliding gearscan be removed through cover open-ing in right side of housing. Smallshims (B) located on front end ofshaft are for adjustment of bearingpre-load; thé larger shims (G) located

on rear end of shaft between bevelpinion and rear bearing cône (17) arefor mesh adjustment of bevel gears,Bearing cups (14) and (17) may bedriven out of housing if renewal isrequired and thé rear bearing cône(17) may be pressed off shaft.

Refer to paragraph 56 for mesh ad-justment of bevel gears.

To reinstall bevel pinion shaft, in-sert thé components in thé ordershown in thé illustration. If new bear-ings or bevel pinion shaft are used,adjust bearings to correct pre-load asfollows: Add enough small shims (B)to provide slight amount of end playwhen nut (13) is tightened to 50 footpounds torque. Measure amount ofshaft end play with dial indicator andremove that amount of shims plus

.0025 of shims to obtain correct pre-load of .002-.004. Shims are providedin thickness of .010, .0125, .015 and .018to obtain thé correct combination.Example: If shaft end play measures.005, a total of .0075 in shims must beremoved; so remove two .010 shimsand replace them with one .0125 shim.After bearings are adjusted and nut(13) tightened to 50 foot pounds, stakea portion of nut into groove in bevelpinion shaft to lock. Note: If bevelpinion shaft must be renewed, usematched gear set M-H part number850 119 Mil and renew bevel ringgear on differential case and adjustmesh of main drive bevel gears as inparagraph 56.

52. INPUT SHAFT. The shaft (8)can be removed by prying out frontseal (11) and removing snap rings (1)and (9); position of snap ring (1) onrear of input shaft is shown in Fig.MH24. Bump input shaft and frontbearing forward and out of housing.Remove rear bearing, gears and gearspacer through cover opening in sideof housing. Front bearing may bepressed off input shaft if renewal is re-quired. Cup washer (2) may be drivenrearward out of housing wall if re-newal is required. Note: It is possibleto remove thé input shaft without re-moving differential assembly from théhousing, but time consumed in at-tempting to remove rear snap ring(1) with differential in place willusually exceed thé time required toR & R differential. Due to use ofannular bail bearings, there are noadjustments on input shaft.

53. REVERSE IDLER SHAFT. Thisshaft can be removed after bevel pin-ion shaft or input shaft is out. Remove

Fig. MH25-Pony differential assembly. Bevel ring gear is retained to differential caseby cap screws. Ad/usting nots (1) contre/ pre/oad on differentia/ foearings and back-

lash (.006-.008) of main drive bevel gears.1. Bearing adjusting nuts2. Differential oil seals3. Bearing retainers4. Differential bearings5. Side gears & thrust washers

6. Pinions & thrust washers7. Pinion shaft8. Differential case9. Pinion shaft lock pin

10. Bevel ring gear

13

Paragraphs 53-56

cap screw in differential compartmentwhich holds shaft lock plate (19) inposition. The idler shaft (20) is pulledrearward and reverse idler gear (21)is removed through cover opening inright side of housing. The two oil-absorbent bushings in reverse idlergear may be pressed out for renewal.Diameter of new idler shaft is .747 inchand bushings should be sized to .7495-.7505. Reverse idler gear is installedwith larger diameter gear toward frontof transmission compartment.

DIFFERENTIALThe differential assembly is con-

tained in rear compartment of com-mon transmission-differential housing.The bevel ring gear is bolted to thédifferential case. Differential bearingsare adjusted by means of threadednuts in bearing retainers.

54. R&R DIFFERENTIAL. Removalof differential assembly requires re-moval of final drive units. Drain trans-mission-differential housing while re-moving final drive units. Remove rearcover or combination belt pulley andpower take-off if so equipped. If nowork is to be done on thé differential,thé bearing retainers (3-Fig. MH25)and housing should be indexed forcorrect reassembly. Remove bearingretainers without disturbing adjust-ing nuts (1) and take differential outrear opening of housing.

When reinstalling differential, bevelring gear is placed on left side ofcompartment when viewed throughrear opening. Adjust backlash of bevelgears and differential bearing pre-load as foliows: Install differentialand fasten bearing retainers to hous-ing without adjusting nut locks. Tight-en both adjusting nuts (1) until heavydrag is obtained then rotate differ-ential to assure that bearings areseated. Back off left adjusting nutuntil backlash of bevel gears is .006-.008 when measured with dial indi-cator on rim of ring gear; then turnin right adjusting nut until bearingsare just slightly pre-loaded (.002-.004pre-load recommended). Note: If bevelpinion shaft is out of transmissioncompartment, this pre-load can be feltas a slight drag when differential isrotated but if bevel pinion shaft is inplace thé pre-load on its bearings willhâve to be taken into account. Installadjusting nut locks, rear cover andfinal drive units. Note: If transmissionbevel pinion shaft and bevel ring gearwere renewed, adjust mesh of thèse

Fig. MH26—Mesh pattern on bevel ringgear teeth. (1) is correct tooth bearing;(2) bevel pinion is too close to cône cen-fer; (3) bevel pinion is too far from cône

center.

gears as explained in MAIN DRIVEBEVEL GEARS section.

55. OVERHAUL. Differential (Fig.MH25) is easily disassembled afterlock pin (9) is driven out of differ-ential case. Bearing cônes (4) maybe pressed off case and bearing cups(4) pulled or driven from retainers(3) for renewal. When renewing oilseals (2) in adjusting nuts (1), installseals with lips facing inward. Whenreassembling, peen edge of case overto lock pin (9) in position. Note: Ifbevel ring gear must be renewed, usematched gear set, M-H part number850 119 Mil, and renew bevel pinion

i

MASSEY-HARRIS PONY

shaft in transmission. Ring gear-to-differential case cap screws should betightened to torque of 40 foot pounds.Adjust mesh of bevel gears as perfollowing paragraph. Adjust differ-ential bearings and backlash of bevelgears as per preceding paragraph.

MAIN DRIVE BEVELGEARS

56. Bevel pinion shaft and bevel ringgear are supplied as a matched setand must not be renewed separateiy,Adjust mesh of thèse bevel gears asfollows: Install bevel pinion shaft anddifferential. Coat pinion teeth withred lead or prussian blue and rotatethé pinion. Observe thé impressionson ring gear teeth caused by contactof bevel pinion teeth. If bevel pinionteeth contact center of ring gear teethas shown in Fig. MH26, they are cor~rectly meshed; if not, add or removeshims (G- Fig. MH23) between bevelpinion and bevel pinion shaft rearbearing cône (17) to move thé bevelpinion into correct mesh position.Note: In order to retain correct pre-load on bevel pinion shaft bearings,whatever thickness of shims (G) isadded or removed from thé shaft, thésame amount of shims (B) should beadded or removed. Recheck backlashafter mesh adjustment is complétée

11

Fig. M H 27—Pony final drive assembly. Wheel axie shaft bearings are adjusted by nul(20). Brake arum (1) is keyed to final drive shaft (2).

15. Bull gear outer snap ring16. Bull (master) gear17. Bull gear inner snap ring18. Inner bearing snap ring19. Inner bearing20. Axie shaft nut & washer21. Axie shaft cap

1. Brake drum2. Final drive shaft3. Bull pinion4. Pinion bearing5. Shaft snap ring6. Cap & gasket7. Brake release spring

8. Brake cover plate9. Actuating cam

10. Brake band11. Wheel axie shaft12. Shaft oil seal13. Outer bearing assembly14. Outer bearing snap ring

14

MASSEY-HARRIS PONY Paragraphs 57-62

FINAL DRIVE57. Final drive assembly includes

two cast housings, each fastened toside of transmission-differential hous-ing. Enclosed in each housing is afinal drive shaft on outer end of whichis a splined pinion gear; this geardrives a master or bull gear locatedon thé wheel axle shaft in lower partof housing. The brake assembly islocated in upper part of housing.

58. R & R FINAL DRIVE UNITS.

To remove one or both final driveunits, block under rear of torque tubeor attach hoist to frame cross angleand drive % inch wooden wedgesunder each side of front frame atfront axle pivot to prevent tractorfrom tipping over. Remove rearwheels and drawbar; disconnect brakerods at pedal shaft and remove thétwo carriage bolts which attach frameside angles to frame cross angle. Re-move nuts holding one final driveh o u s i n g to transmission-differentialhousing and pull final drive unit fromtractor; repeat for other final drive.

59. MASTER (BULL) GEAR AND

WHEEL AXLE SHAFT. Bull gear or

wheel axle shaft may be removedwithout detaching final drive housingfrom tractor. Place jack under trans-mission and remove rear wheel anddrawbar. Take down bull gear cover;remove dust cap (21-Fig. MH27) andstaked nut (20). Remove inner bear-ing cône (19) and thé bull gear innersnap ring (17) from thé shaft. Installa puller as illustrated in Fig. MH28;then push thé wheel axle shaft outof bull gear and housing. Outer bear-ing cône (13-Fig. MH27) and oil seal(12) will corne out with thé wheel axleshaft. Inner and outer bearing cups(19) and (13) can be pulled or drivenfrom housing for renewal. Bull gear(16) can be reinstalled in reverse ofits original position so that opposite,unworn sides of teeth are in contactwith pinion and thus increase life ofbull gear. When reassembling, wheelaxle shaft bearings should be given aslight amount of pre-load but notenough to compress thé housing. Stakenut (20) into groove of wheel axleshaft to lock. Note: If thé complètefinal drive is being overhauled, it isadvisable to install bull gear andwheel axle shaft first so that pre-loadon bearings can be felt.

I

60. BULL PINION AND DRIVESHAFT. It is possible to remove thébull pinion and shaft bearing without

F/g. MH28—Removlng Pony wheel axleshaft and bull gear. Puller screws arethreaded info drawbar mounting holes in

housing.

detaching final drive housing, how-ever, if bearing is tight on shaft itmay be necessary to detach thé hous-ing and perform work as follows : Withfinal drive housing removed, twomethods may be used to remove bullgear pinion or its shaft. Remove outercap (6) and snap ring (5) ; take abrass drift and heavy hammer andbump thé shaft (2) inward and thusout of bearing (4) and pinion (3).If available, a press may be used topress shaft out of housing. If pressis not available and shaft will notgive after a few blows with thé ham-mer and drift, unlock set screw onbrake drum (1) and bump thé shaftoutward far enough to install a pulleron bearing and pinion. Pull bearingand pinion from shaft and remove

shaft and brake drum from inneropening of housing. Bull gear pinioncan be reinstalled in reverse of itsoriginal position so that opposite un-worn sides of its teeth contact thébull gear teeth and thus increasepinion life. Because bail bearings areused, no adjustment is required on thisassembly.

BRAKES61. ADJUST. Two adjustments can

be made on brakes. As shown inFig. MH29, thé rod between brakecam shaft and pedal shaft has an ad-justable devis. Thèse rods are ad-justed only to equalize thé pedals intheir released position. Brake bandsare adjusted by means of thé adjust-ing nuts (6) which are exposed whenfront brake cover plate (2) is off asin thé illustration. To adjust, loosenthé lock nut and turn adjusting nut(6) . With rear wheel raised, thé drumshould turn freely within brake bandwhen brakes are released. Adjustbands on both sides of tractor andtest by applying pressure to bothpedals at once with tractor in opéra-tion and rear wheels off ground.Equalize brakes by loosening adjust-ment nut (6) on thé tighter band.

62. R & R BANDS. To remove brakeband, remove both front and rearbrake cover plates and unscrew locknut and adjusting nut (6) from lower

F/9. MH29-Ad/usf-

ing Pony brakes.

Adjust pedal rod

to equalize height

of pedals. Turn ad-

justing nut (6) on

brake band to ad-

just lining clear-

ance.

1. Brake cam shaft

2. Brake cover plate

3. Release spring

4. Actuating cam

5. Brake band

6. Adjusting nut

15

Paragraphs 62-67

end of brake band. Pivot thé actuatingcam (4) so that upper end of brakeband is exposed enough to push outheadless pin which fastens band to thécam. Thread brake band around drumand out either front or rear opening.

Lining is supplied separately or com-plète band with riveted lining can bepurchased. Adjust brakes as per pre-ceding paragraph.

63. R & R DRUMS. Brake drums are

MASSEY-HARRIS PONY

removed with final drive shaft asdescribed in preceding paragrapntitled Bull Gear Pinion and DriveShaft. Drum is keyed to shaft andlocked m position by a wire-safetieciset screw.

BELT PULLEY AND POWER TAKE-OFF

64. ADJUST PULLEY SHAFTBEARINGS. The only adjustmentwhich can be performed is thé adjust-ment of belt puliey shaft bearings.Remove belt puliey retaining capscrew and belt puliey (16—Fig.MH30); then add or remove shims(13) until puliey shaft turns freely inits bearings with no end play.

65. R & R POWER TAKE-OFFSHAFT. Remove unit from tractor.Remove shaft cap and lower cover (23—Fig. MH30). Remove snap ring (26)and bump power take-ofï shaft rear-ward out of housing. Spur gear (22)can then be withdrawn through théopening in bottom of housing. Bailbearings (19) and (24) and seal (18)may be driven out of housing for in-spection.

66. R & R BELT PULLEY SHAFT.Remove puliey retaining cap screw,puliey and Woodruff key from pulieyshaft. Remove bearing cap (14), notingnumber of shims (13) between it andhousing. Remove expansion plug (6)by piercing it with a chisel or punchand prying it out of its bore. Buck-upgear (9), and press belt puliey shaft outthé puliey side of housing. Bearingcup and cône (12) will corne out withpuliey shaft. Bevel gear (9) and bear-ing cône (8) can then be removed frominside of housing. Bearing cup (8) willremain in its bore and may be drivenout for renewal. Oil seal (15) is pressedinto bearing cap (14) so that its lipfaces inward. Shims (13) are providedfor adjustment of puliey shaft bear-ings. A gasket is placed between shimpack (13) and housing.

67. R & R DRIVE SHAFT. Removeunit from tractor, rivet from lever(5) and tap lever off shaft (1). Pullshifter shaft and coupling (2) for-ward, being careful not to lose detentbail (3) as thé shifter shaft is pulled

from housing. Unstake and remove nut(27) from drive shaft (D). Removesnap ring (31) and tap drive shaft for-ward and out of housing. Bevel gear(28) will remain in thé housing while

bearing (30) and spur pinion (29) willbe removed with drive shaft. If detentspring (3) requires renewal, it can beremoved through thé opening (4)when plug is removed.

19

Fig. MH30—Pony combination belt pulley and power take-off unit. Drive shaft (D) pilotsin bushing in rear of transmission input shaft and coupling (2) engages splined end of

input shaft to drive thé unit. Shims (13) are for ad'iustment of puliey shaft bearings.

D. Drive shaft

Shifter shaftShift couplingDetent bail & springPlug (V2)Shifter leverPlug (2V2)Bearing snap ringRight hand bearingBevel driven gearGear snap ringShaft snap ring

PTO. Power take-cff shafî

12. Left hand bearing13. Gasket and shims14. Bearing cap15. Shaft oil seal16. Pulley17. Pulley snap ring18. PTO oil seal19. PTO rear bearing20. Rear bearing snap ring21. Spur gear snap ring22. Spur gear

23.24.25.26.272S.29.30.31.32.

BP. Belt pulley shaft

Lower coverPTO front bearingFront bearing snap ringPTO snap ringBevel gear nutBevel drive gearSpur pinionDrive shaft bearingBearing snap ringShaft snap ring

16

MASSEY-HARRIS PONY Paragraphs 70-71

POWER LIFT(HYDRAULIC UNIT)

2

8

Adjustmenf

70. Stops (5 & 6—Fig. MH32) maybe adjusted to obtain thé desired raisedand lowered positions of thé particularimplement being used, by looseningthé square head set screws (7) andmoving thé stops on rod (1). Adjuststop (6) to obtain thé desired loweredposition, and stop (5) to obtain thédesired raised position.

R & R And Overhaul CylinderAnd Control Valve

71. It is recommended that hydrau-lic cylinder and control valve be re-moved from tractor as a unit so as toeliminate dirt and oil leakage whichare inévitable if units are disassem-bled and reassembled on tractor. Re-move cap from drain pipe in thé oilréservoir and allow réservoir to drain.Remove hydraulic lines pad (3—Fig. MH32) from thé control valve.Remove thé two cylinder attachingcotter keys and pins and lower cylin-der and control valve (as a unit) awayfrom tractor. Separate control valvefrom cylinder by removing thé twocontrol valve attaching cap screws.

Overhaul of thé cylinder normallyconsists of renewing packings and gas-kets; however, métal parts should berenewed when they show wear. Firststep in disassembly is to remove thésnap ring (8—Fig. MH33) and with-draw cylinder head and piston assem-bly from cylinder. The need and pro-

cédure for further disassembly is évi-dent after an examination of thé unit.When reassembling thé unit, lubricate

F/g. MH37— Phantom viewshow/ng installation ofhydraulic power lift sys-tem on Massey-H a r r i s

Pony tractor.1. Coil bracket2. Oil réservoir3. Réservoir drain pipe4. Hydraulic lines5. Front lift shaft6. Control valve7. Hydraulic cylinder8. Rear lift shaft9. Control lever

ail internai parts with SAE No. 10 oiland install new "O" rings5 seals andgaskets.

F/g. MH32—Pony hydrau-lic cylinder and control

valve assembly*1. Follow-up rod2. Pad attaching screws3. Hydraulic lines pad4. Control valve5. Adjusting stop6. Adjusting stop7. Set screw

F/g. MH33—Exploded view of Pony hydraulic lift work cylinder.1. Cylinder 10. Ring2. Plug & ring 6. Wiper ring 11. Cylinder head3. Adjusting stops 7. Retainer washer 12. Shaft4. Stop rod & plates 8. Snap ring 13. Piston5. Leather washer 9. "O" ring 14. "O" ring

17

Pamgraphs 71-74

Procédure for disassembling thé re-moved control valve unit is évidentafter an examination of thé unit andréférence to Fig. MH34. The partsshould be washed and thoroughly ex-amined for nicks and excessive wear.When reassembling, renew ail sealsand gaskets and any other question-able parts.

When reinstalling control valve tothé cylinder, make certain that thétwo "O" ring gaskets are properlylocated between thé parting surfacesof thé control valve and cylinder.When reinstalling thé hydraulic Unespad to thé control valve, make cer-tain that thé "O" ring gasket (2—Fig.MH35) is properly located, and thatthé pad gasket does not cover reliefport (1). Tighten thé four round headpad attaching screws to a torque of7-9 foot pounds only. Remove hoodand fill réservoir up to baffle; startengine and operate power lift severaltimes; then fill réservoir up to baffleagain, and replace hood.

Trouble Shooting

72. LOSS OF LIFTING POWER. In-dicates that hydraulic lines pad gasketon control valve is covering relief port(1—Fig. MH35) or thé "O" ring gas-kets which are located between thécontrol valve and cylinder, hydrauliclines pad and control valve, hydrauliclines pad and réservoir, and/or réser-voir and pump, are improperly seated.Renew gasket between pad and con-trol valve, and install new "O" ringgaskets.

FLUID (OÏL) LEAKS BETWEENHYDRAULIC LINES PAD AND CON-TROL VALVE. Indicates that toomuch initial torque was applied whentightening thé four round head padattaching screws. Remove pad; installa new pad gasket and "O" ring gas-ket; reinstall and tighten screws to atorque of 7-9 foot pounds only.

LIFT WILL NOT RAISE IMPLE-MENT. Indicates that oil réservoir isempty, or, if réservoir is full, it indi-cates that thé pump, control valve,and/or cylinder bas failed. Inspect andrenew (or overhaul in case cylinderhas failed) any faulty units.

LIFT WILL NOT STAY IN POSI-TION. Indicates that control valve isfaulty or that piston seals are leaking.Renew valve, or install new pistonseals.

SHORT PISTON SEAL LIFE. Indi-cates that cylinder, piston or bearingis worn. Inspect and renew wornparts.

HYDRAULIC PUMP

73. The gear type pump is locatedon upper front end of thé cylinderblock and is driven by thé fan belt.The working fluid (SAE No. 10 oil) issupplied by an oil réservoir which isattached to thé pump. Hydraulic sys-

Fig. MH34—Cvt-away view of thé Pony hydraulic lift control valve.

MASSEY-HARRIS PONY

tem should be drained and r e f i l n -at least once a year to remove ar.yaccumulation of dirt or water in t: eréservoir. Drain sysfem immédiate::-after using, while oil is still warm.

R & R And Overhaul

74. Drain cooling System and n.-move hood, radiator, grille, and uppe:radiator hose. Remove cap from drar,pipe in thé oil réservoir, and allow rés-ervoir to drain. Disconnect fan bel:tensioner at hydraulic pump, and re-move belt. Remove thé boit whicr.holds thé coil clamp to thé coil bracke*on thé oil réservoir, and lay coil out < • :thé way. Remove thé two nuts whuhold thé hydraulic lines pad to thé c lréservoir. Remove thé two remainiiigcap screws that hold thé pump to thécylinder block; lift pump, réserveand fan assembly (as a unit) frcrrtractor. Remove thé one remaininscap screw which holds thé oil réservoirto thé pump, and remove réserverRemove fan and pulley from purrushaft.

Remove cap screws retaining puncover to pump body and remove î!cover, bearings, gears and seals. Checkthé component parts against thé v a l -ues listed below.

Gear bore in pump body(New) 1.1665-1.167^

Renew body if gear bore is 1.17

Gear diameter (New) . . . 1.1655-1.16(

Renew gears if diameter is ! . < •

Max. diam. clearance betweengears and body o.in

Bearing bore (New) 0.500-0.5i

Max. allowable bearing bore. . . . O . f v

Shaft diameter (New) . . .0.4975-0.49:

Min. allowable shaft dia 0.4l-

1 2

1. Spring2. Outer spring retainer3. Outer spool sleeve4. Inner spring retainer5. Inner spool sleeve6. Packing ring

7. Body packing8. Spool9. Body

10. Valve11. Valve packing

12. Cover screws13. Spring14. Cover15. Spring16. Washer17. Spring guide

Fig. MH35—Top view of Massey-Har»Pony contre/ valve with hydrau/ic li'ne*

pad removed.

1. Relief port 2. "O" ring gasket

18

MASSEY-HARRIS PONY Paragraph 74

Reassemble and reinstall pump, rés-ervoir and fan assembly (as a unit)by reversing thé disassembly and re-moval procédure, making certain thatthé two "O" ring gaskets are properlylocated betwee-n thé parting surfaces

of thé pump and oil réservoir. Wheiireinstalling thé hydraulic lines pad tothé oil réservoir, make certain thatthé two "O" ring gaskets are properlylocated and tighten thé two nuts to atorque of 20-25 foot pounds. Before

replacing hood, fill réservoir up tobaffle; start engine and operate powerlift several Urnes; then fill réservoirup to baffle again.

F/g. MH36—Exploded view of Pony hydraulic lift pump.

1. Pump body3. Body drive gear bearing4. Body driven gear bearing

5. Drive gear6. Driven gear7. Cover bearing8. Spring

9. Seal ring10. Seal ring11. Cover

19