Serv

ice

Man

ual

Service Manual

THIS IS A MANUAL PRODUCED BY JENSALES INC. WITHOUT THE AUTHORIZATION OF MASSEY HARRIS MASSEY FERGUSON OR IT’S SUCCESSORS. MASSEY HARRIS MASSEY FERGUSON AND IT’S SUCCESSORS

ARE NOT RESPONSIBLE FOR THE QUALITY OR ACCURACY OF THIS MANUAL.

TRADE MARKS AND TRADE NAMES CONTAINED AND USED HEREIN ARE THOSE OF OTHERS, AND ARE USED HERE IN A DESCRIPTIVE SENSE TO REFER TO THE PRODUCTS OF OTHERS.

MF200 & MF200B

MH-S-MF200B

PART1-GENERAL SERVICE INFORMATION

INDEX PAGE

SPECIAL TOOLS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. ii

SAFETY PRECAUTIONS ........................................................... " 1

SERVICE PROCEDURE RECOMMENDATIONS ......................................... " 1

ELECTRICAL SYSTEM INFORMATION .................................................. 2

LUBRICATION AND CAPACITIES .. " .....................•............................ 3

TIGHTENING TORQUE RECOMMENDATIONS ........................................... 5

Printed in U.S.A. MF 200 Crawler Service Information

ELECTRICAL SYSTEM INFORMATION

When connecting a booster battery or bat­tery charger to the Crawler batteries . . . al­ways be sure to connect the negative terminals together and the positive terminals to each other. It is good practice to disconnect the Crawler cables from the batteries when using a charger. (It is also good practice to connect the booster batteries to the Crawler cables when making a jump start rather than connect directly to the starter solenoid.)

Do not short across any of the terminals on the alternator (A.C. generator) or the voltage regulator.

Do not ground any terminals except as spe­cifically instructed.

Do not attempt to "polarize" the alternator.

Specific Freezing

Do not add electrolyte to the battery once it has been activated and charged . .. colorless, odorless drinking water (or distilled water) is to be used to bring the liquid level to its correct point above the plates.

When a battery is fully charged (or after it has been recharged) the specific gravity of each cell should be between 1.230-1.310 . . . a reading other than this indicates that the bat­tery may not give satisfactory service.

The freezing pOint of electrolyte depends on its specific gravity ... see Table 1 which relates specific gravity to approximate freezing temperatures . . . do not add anti-freeze to a battery in an attempt to keep it from freezing ... recharge the battery.

Specific Freezing Gravity Temperature Gravity Temperature

1.100 18 0 F. 1.200 -1r F. 1.120 13 0 F. 1.220 -310 F. 1.140 8 0 F. 1.240 -50 0 F. 1.160 1 0 F. 1.260 -75 0 F. 1.180 _6 0 F. 1.280 -920 F.

TABLE 1

-2-

PART 2 - ENGINE

INDEX

PAGE

INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 1

ENGINE REMOVAL ................................................................ 2

ENGINE INSTALLATION ............................................................ 5

CYLINDER HEAD .................................................................. 6

VALVES ........................................... ".............................. 7

VALVE GUIDES ..... "............................................................. 8

VALVE SEATS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

VALVE SPRINGS .................................................................. 11

TAPPETS ........................................................................ 11

CYLI NDER HEAD REASSEMBLY ..................................................... 12

CYLINDER HEAD INSTALLATION .................................................... 12

ADJUSTING VALVE TAPPET CLEARANCE .............................................. 13

CYLINDER BLOCK (STRIPPED) ...................................................... 14

PISTON AND CONNECTING ROD ASSEMBLY ........................................... 15

CYLINDER LINERS ................................................................. 19

TIMING GEAR COVER AND FRONT CRANKSHAFT OIL SEAL .............................. 21

TIMING GEARS ................................................................... 22

CAMSHAFT ........ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 27

TIMING GEAR HOUSING ............................................................ 28

CRANKSHAFT AND MAIN BEARINGS ................................................. 30

REAR CRANKSHAFT OIL SEAL ....................................................... 33

FLYWHEEL ...................................................................... 34

INDEX (Cont.)

PAGE

FUEL AND AIR SYSTEM .......................................................... " 35 Description ................................................................. " 35 Air Filter ..................................................................... 35 Fuel Tank ..................................................................... 35 Fuel Lift Pump ................................................................. 36 Fuel Oil Filters ................................................................. 37 Fuel Injection Pump ............................................................. 38 Fuel Pump Timing .............................................................. 38 Injectors ..................................................................... 39 Bleeding .Air From Fuel System ................................................... 42 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 43

LUBRICATING SYSTEM ............................................................. 44 Specifications ................................................................. 48

ENGINE SPECIFICATIONS .......................................................... 49

TIGHTEN THE CAPSCREWS AT THIS TIME.

3. Install special tool MFN 747A onto the crankshaft and locate it in the bore of the cover to correctly position the cover in relation to the crankshaft.

4. I nstall the - remammg capscrews and tighten them at this time to hold the cover in

its proper relationship to the crankshaft.

NOTE: Observe that the bottom capscrew below the front oil seal has a special sealing washer.

5. Remove the special tool, then complete reassembly by reversing the disassembly pro­cedure.

TIMING GEARS

The timing gear train, as shown in Fig. 29, consists of the crankshaft gear, idler gear, camshaft gear and injection pump drive gear. The crankshaft gear drives the camshaft and the injection pump through the large idler gear.

The idler gear is mounted on a hub bolted to the front of the cylinder block.

All of the timing gears are marked during production and when reassembling the engine, all marks must align when No. 1 piston is at T. D.C. on compression stroke; see Fig. 29. All replacement timing gears are marked and are available in standard size only.

Fig. 29 - TIMING GEARS WITH MARKS PROPERLY ALIGNED

NOTE: Due to the odd number of teeth in the idler gear, the complete set of timing marks will align only once every 18 crank­shaft revolutions.

CHECKING TIMING GEAR BACKLASH

To check timing gear backlash, proceed as follows:

1. Remove the timing gear cover as out­lined earlier.

2. Check the backlash between the timing gears with a dial indicator or feeler gauge, as shown in Fig. 30. The backlash between any two gears in the timing gear train must be between 0.003" -0.006".

NOTE: Also, check the backlash between

Fig. 30 - MEASURING TIMING GEAR BACKLASH

-22-

PART 3 - CLUTCH

INDEX

PAGE

REMOVAL AND DiSASSEMBLy ....................................................... 3

INSPECTION AND REPAIR. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. .. 4

REASSEMBLY AND INSTALLATION .................................................... 5

CLUTCH ADJUSTMENTS ........................................... , ................. 6 Clutch Release Levers ............................................................ 6 Clutch Pedal Free Travel .......................................................... 6

TECHNICAL DATA ............................................................... ,. 7

Printed in U.S.A. MF 200 CRAWLER - CLUTCH

PART 5 - HYDRAULIC COUPLING

INDEX

Page DESCRIPTION ....................................................... 1 LUBRICATION SPECIFICATIONS .................................... 1 SERVICING AND REPAIR ............................................ 1

Removing Cover Bearing and Oil Seal ............................. 2 Replacing Oil Seals .............................................. 3 Assembling Turbine and Cover ................................... 3 Servicing Flywheel ............................................... 4 Installing A New Flywheel ....................................... 4 Assembling Hydraulic Coupling ................................... 5

DESCRIPTION Major Components;

The hydraulic coupler bolted directly to the engine crankshaft, transmits engine torque to the Hydraulic Reverser Transmission.

Fig. 1 - Hydraulic Coupling Assembly

Printed in U.S.A. MF 200 Crawler

1. Flywheel 2. Turbine (Driven Member) 3. Pump and Cover Assembly

With the exception of torque multiplication, the hy­draulic coupler is similar in operation to a torque con­verter. Engine stall speed is 550 to 600 rpm. When the oil temperature in the hydraulic coupler reaches 3200 F, due to excessive stalling, a safety fuse-type drain plug will release allowing the oil to drain.

LUBRICATION SPECIFICATIONS The hydraulic coupler is initially filled with SAE lOW

Oil. The oil should be changed annually, or every 1000 hours. MF Spec. M-lllO "H" type "A" Hydraulic and Transmission Oil maybe used in lieu of SAE lOW. The capacity of the coupler is approximately 6 U.S. quarts.

SERVICING AND REPAIR 1. To gain access to the hydraulic coupling, remove

the engine as outlined in Part I.

CAUTION: Always install the loader "safety bar" when work­ing under the loader.

2. After removing the engine, with hydraulic cou­pling attached, remove both drain plugs from the hydraulic coupling and drain the oil.

Hydraulic Coupling 1

PART 6

HYDRAULIC REVERSER TRANSMISSION,

RING GEAR AND PINION

CONTENTS

PAGE

SPECIFICATIONS .................................................................. 4.

DESCRIPTION 6

Hydraulic Circuit Description ...................................................... 6

HYDRAULIC REVERSER TRANSMISSION ............................................. . 7 7 9 9_

Removal Installation Disassembly Reassembly .................................................................. 12

REVERSER CLUTCH. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . .. 15 Disassembly .................................................................. 15 Piston ....................................................................... 15

Disassembly ............................................................... 15 Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 15 Reassembly .............................................................. 17

Reassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 19

OIL DISTRIBUTOR ................................................................. 20 Disassembly .................................................................. 20 Reassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 20

CLUTCH (Inching or Pause) PEDAL ~OUSING .......................................... 23 Disassembly .................................................................. 23 Reassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 23

TRANSMISSION TEST PROCEDURE ................................................... 25 Testing Hydraulic Pump ......................................................... 25 Testing Main Relief Valve Pressure ................................................ 25 Checking Clutch Working Pressure ................................................ 26 Restrictor Valve Setting ......................................................... 26 Trouble-Shooting Chart .......................................................... 27

HYDRAULIC PUMP 28

Description ................................................................... 28 Removal and Installation ........................................................ 28 Disassembly .................................................................. 28 Reassembly .................................................................. 28

See Also: Part 4 for Ring Gear and Pinion

-1- MF 200B Crawler - Hyd. Reverser Trans.

PART 7 - STEERING CLUTCHES AND BRAKES

CONTENTS

PAGE

DESCRIPTION AND OPERATION

ADJUSTMENTS .................................................................... 2 Steering Clutches and Brakes .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2 Brake Band Adjustment .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 4 Brake Pedal Free Travel Adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 4 Steering Lever Free Travel Adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. .. 4

STEERI NG CLUTCHES .............................................................. 5 Replacement of Clutch Plates and Discs ................... . . . . . . . . . . . . . . . . . . . . . . . .. 5 Removal of Clutch Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 6 Inspection .................................................................... 7 Reinstalling ................................................................... 7

STEERI NG BRAKES ................................................................ 8 Brake Drums .................................................................. 8 Brake Bands ....... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 8

CLUTCH RELEASE BEARI NGS ....................................................... 10 Replacement ................................................................. 10

SPECIFICATIONS .................................................................. 12

DESCRIPTION AND OPERATION

Steering clutches are multiple disc, dry type, consisting of eight steel driving discs and eight driven discs. Brakes are mechanically actuated and consist of an external contracting band and drum.

The internal toothed clutch outer hub is also the brake drum.

MF 200 Crawler 4/71 -1-

Steering clutches are disengaged and steering brakes are applied using two levers with dual mechanical linkage.

A master brake pedal when applied acts simultaneously upon both individual steering brakes.

Steering Clutches and Brakes

PART 8 - FINAL DRIVES

INDEX

PAGE

DEseRI PTION ..................................................................... 1

REMOVAL ........................................................................ 1

INSTALLATION .................................................................... 2

DISASSEMBLY .................................................................... 2

REASSEMBLY ..................................................................... 4

DESCRIPTION

The final drives consist of independent hous­ings, bolted to each side of the four speed trans­mission and reduction drive unit. Each housing contains a pinion shaft, pinion gear, spur gear and final drive shaft. The pinion and final drive shafts are supported by tapered roller bearings. An external contracting band and drum type

steering brake is an integral part of each unit.

The driving torque is transmitted from the transmission through a pinion and ring gear, multiple disc and drum steering clutch, pinion shaft and gear through a spur gear and final drive shaft. Each final drive unit contains a separate gear lubrication compartment.

REMOVAL

1. Remove the frame shields.

2. Release the track tension by loosening the track adjuster relief valve.

3. Remove the track master pin and roll the track out on the floor, see Fig. 1.

4. Remove tool box housing assembly and floor plate.

5. Remove the cap that holds the final drive assembly to the rear cross bar.

6. Remove the "U" brackets holding the dozer anchor assembly to cross bar.

7. Drain the oil from drive housing.

Printed in U.S.A. -1-

Fig. 1 - TRACK SPLIT PRIOR TO FINAL DRIVE REMOVAL

PART 9 - SUSPENSION AND TRACKS

INDEX

PAGE

DESCRI PTION ..................................................................... 1

TRACKS ......................................................................... 1 Removing the Tracks .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 1 I nspection and Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 1 Installing the Tracks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2 Disassembling the Tracks .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 3 Reassembling the Tracks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 3

TRACK ROLLER FRAME. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 3 Removal and Installation ...... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 3

REAR CROSS BAR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 4 Removing Cross Bar. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 4 Installing Cross Bar. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 4

FRONT BEAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 5 Removing Front Beam. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 5 I nstalling Front Beam . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 6

SPROCKET WHEEL ............... ~ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 6 Removal and Installation ....... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 6

IDLER WHEEL .................................................................... 7 Removal and Installation ...... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 7 Disassembly ..................................................................... 8 Reassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. c

TRACK CARRI ER ROLLERS .............. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 9 Removal and Installation .............. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 9 Disassembly ..................................................................... 10 Reassembly .............................. " ..................................... 11

TRACK ROLLERS ................................................................... 11 Removal and Installation ........................................................... 12 Disassembly and Reassembly ...................................................... 13

SPECIFICATIONS .................................................................. 14

Printed in U.S.A. MF 200 Crawler - Suspension and Tracks

PART 11 - LOADERS, DOZERS AND RIPPER

CONTENTS

PAGE

SAFETY PRECAUTIONS 1

SERVICE INFORMATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. .. . . . . . . . .. . . . . . . .. 2

UNDERSTANDING THE HYDRAULIC SYSTEMS .......................................... 13 Loaders Dozers Ripper

14 14 14

TESTS AND ADJUSTMENTS .......................................................... 15 Checking System Main Pressure .................................................... 15 Testing and Adjusting Circuit Relief Within 3-Spool Valve ................................. 15 Testing for Valve Spool Leakage and Checking Spool Travel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 16 Testing "Load Checks" ............................................................ 17 Checking Pump Efficiency (GPM) ................................................... 17 Testing for Internal Cylinder Leakage ................................................. 18 Testing and Adjusting Clam Cylinder Circuit Relief. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 18

TROUBLE SHOOTING ............................................................... 20

RESERVOIR ....................................................................... 23

FILTER AND BY-PASS POPPET ....................................................... 23

HYDRAULIC PUMP ................................................................. 25

3-SPOOL CONTROL VALVE .......................................................... 29

1-SPOOL CONTROL VALVE .......................................................... 35

CYLINDERS ....................................................................... 37

MF 200 Crawler Loaders, Dozers and Ripper

UNDERSTANDING THE HYDRAULIC SYSTEMS

Figures 1 through 9 are graphic symbol diagrams which illustrate the various hydraulic systems which may be encountered. Figure 10 explains the meanings of some of the graphic symbols used ... as an aid to those servicemen that do not know, but wish to learn this form of reading.

Reading of the graphic diagrams may be likened to reading, or tracing, an electrical sche­matic. The symbols are meant to illustrate the function of a component rather than its construc­tion; however, certain values have been included in the diagrams so as to aid in trouble-shooting. Additional explanations are as follows:

Physical location of the components are as indicated in Figs. 11 and 12.

Reservoir . . . is vented to atmosphere and contains the system's filter located on the suction side of the pump. The filter has a by-pass poppet which allows oil flow past the filter (should it be­come clogged).

Pump . . . fixed displacement, gear type. Mounted behind the radiator grille and bolted to the radiator support. The pump is driven by a shaft and coupling arrangement bolted to the engine's crankshaft pulley.

3-Spool Control Valve . .. is an open center; series/parallel valve with integral system relief.

Fig. 11 - APPROXIMATE LOCATION OF HYDRAULIC COMPONENTS OF LOADER w/"4-N-1" BUCKET

It also contains a circuit relief for "F" port (of third spool) and provisions for installing a "pres­sure beyond" fitting. This fitting allows another (1-spool) valve assembly to be connected into the system. (The valve ports have cast identifi­cation letters for easier circuit tracing.) The graphic symbols used for the valve show it with all spools in spring centered positions. The first spool (controlling ports A and B) has four posi­tions, but the other two spools have only three. By visualizing spool movement from the centered position, the oil flow to the circuits will be appar­ent. The valve contains load checks for each spool. Its internal passageways are arranged so that the first and second spool are in parallel, but the third spool is in series with the first and in parallel with the second.

1-Spool Control Valve . .. is open center type with two load checks. This valve is used in var­ious applications when a fourth spool is required. It receives its oil supply from the 3-spool valve but has a separate oil return. The valve is a three position, four way valve and is graphically illus­trated in the "neutral" position. (A four way valve is one that has four working connections -pressure inlet, cylinder head-end, cylinder rod­end and reservoir.)

Hydraulic cylinders ... are all double-acting (single rod) type but vary in bore and stroke, depending upon specific application. The cylinder head and rod ends connect to the valve ports as shown in the symbol diagrams.

Fig. 12 - APPROXIMATE LOCATION OF HYDRAULIC COMPONENTS OF INSIDE MOUNTED DOZER

M F 200 Crawler -13- Loaders, Dozers and Ripper

TROUBLE-SHOOTING

The trouble-shooting problem chart is di­vided into two categories of "symptoms" . . . one lists OPERATIONAL symptoms while the other lists COMPONENT symptoms.

'Select the symptom, from the problem chart, most like the malfunction experienced and

refer to the "Possible Cause" paragraphs in the sequence order listed. (The references may seem to be listed in a haphazardly manner, but an attempt has been made to refer to the most easily checked, or most likely cause, in logical order.)

OPERATIONAL SYMPTOMS

1. Foaming Oil ................................................ . 2. Fails to Raise ............................................... . 3. Slow or Erratic Lift (Also See # 17) .............................. . 4. Arms not Lifting Equally ....................................... . 5. Does not have Adequate Lift or Break-Out Capacity ................. . 6. Drops with Spool in "Raise" and another spool is Activated ........... . 7. Drops with Spool in "Neutral" Position ........................... . 8. Excessive Breakage of Hoses .................................. . 9. Low System Pressure (as Determined by Pressure Gauge) ........... .

COMPONENT SYMPTOMS

CONTROL VALVE

10. External Leakage of Valve ..................................... . 11. "Sticky" Valve Spool (s) ....................................... . 12. Unable to "Push" Valve Spool into Valve Body ..................... . 13. Spring-Centered Spool does not Return to Neutral .................. . 14. "Float" Spool does not Stay in Detent ............................ .

HYDRAULIC PUMP

15. Pump Noisy and/or Overheating ............................... . 16. Pump Shaft Seal Leaking ...................................... . 17. Pump GPM too Low (as Determined by Tests) ..................... .

CYLINDERS

18. Rapid Leak Down ............................................ . 19. Cylinder Rod "Settles" into Barrel ............................... . 20. Cylinder Rod "Creeps" out of Barrel ............................. .

-20-

SEE POSSIBLE CAUSE

A,B,C A,B,D,E,H,T

F,A,B,C,H,G,Q,S,T G,I,X J,F,E

K Z,L,M,N

O,H H,Q

SEE POSSI BLE CAUSE

Y,V,W S,T

S,Y,T S,AA,AB,T

R

A,B,P,D,E,Q Q

F,A,B,P,C,D,Q

Z,M,U,N,L,Y L,M,N,U L,M,N,U

PART 12 - BACKHOE

CONTENTS

PAGE

SAFETY PRECAUTIONS 1

SERVICE INFORMATION ............................................................ 2

UNDERSTANDING THE HYDRAULIC SYSTEM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . .. 5

TESTS AND ADJUSTMENTS ......................................................... 7 Operational Check of Backhoe '" . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . .. 7 Operational Check of Swing ...................................................... 10 Checking System Main Pressure ...................................... ; ........... 11 Testing Circuit Reliefs ........................................................... 11 Adjusting Circuit Reliefs ......................................................... 12 Testing "Load Checks" .......................................................... 14 Testing for Valve Spool Leakage and Checking Spool Travel ............................ 14 Testing for Internal Cylinder Leakage ............................................ " 15

TROUBLE-SHOOTING .............................................................. 16

CONTROL VALVE .................................................................. 19

CYLINDERS - DOUBLE-ACTING ..................................... : ............... 25

ROTARY CYLINDER - MF PART NO. 708190 M91 ....................................... 33

MF 200 Crawler Backhoe