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Nebraska Tractor Tests Tractor Test and Power Museum, The Lester F.Larsen

1-1-1954

Test 528: John Deere 70 DieselTractor Test MuseumUniversity of Nebraska

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Museum, Tractor Test , "Test 528: John Deere 70 Diesel" (1954). Nebraska Tractor Tests. Paper 90.http://digitalcommons.unl.edu/tractormuseumlit/90

The Experiment StationUniversity of Nebraska College of Agriculture

W. V. Lambert, Director, Lincoln, Nebraska

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Department of Agricultural EngineeringDates of test: October 19 to October 22, 1954Manufacturer: JOHN DEERE WATERLOO TRACT-

OR WORKS OF DEERE MANUFACTURINGCOMPANY, WATERLOO, IOWA

Manufacturer's rating: Not rated

HpCnaksIIaftspeedrpm

BELT HORSEPOWER TESTS

Fuel Consumption

I

Water

I

Te.., Dee F

Ilia

td rome erUR. maaof

Gal H;p-hr Lb per gal Cooling Air mercuryper honr I per pI I hp-hour per hour. med !

TESTS B & C-lOO% MAXIMUM LOAD-TWO HOURS

1125 I 2.841 I 17.74 i 0.397 I 0.00 I 155 I 50TEST D-RA TED LOAD-ONE HOUR

44.14 I 1126 I 2.491 I 17.72 1 0.398 1 0.00 1 153TEST E-VARYING LOAD-TWO HOURS (20 minute runs; last

44.06 1 1125 I 2.487 I 17.72 1 0.398 1 [154 1

3.03 I 1242 I 0.830 I 3.65 [ 1.931 I 1 143 I23.14 I 1182 I 1.559 I 14.84 I 0.475 I 1 148 149.73 I 1114 [ 2.823 I 17.62 I 0.400 1 [160 111.84 I 1209 I 1.120 I 10.57 I 0.666 I .. I 146 I33.82 I 1157 I 2.010 I 16.83 I 0.419 I 1 152 1

27.60 I 1171 I 1.805 I 15.29.1 0.461 I 0.00 1 151 1TORQUE (At Dynamometer)

Eng rpm. 11123 [1073 [1019 I 970 I 916 I 867 [Lb-ft. [ 259.41 295.11 302.8 [ 309.8 [ 313.3 [ 314.11Dyn rpm. 11019 I 969 1 918 1 871 I 820 [ 772 I

50.40 1 29.003

49 T 28.975line average)49 1

49T

49T48T48149149T 28.975

816 I tio [716 1668314.11 318.51319.41316.8724 I 680 1630 1584

Hp

DRA WBAR HORSEPOWER TESTS

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Draw I Speed

I

Crauk

I

s~~p

I

Fuel Consumption

I

~::dr Temp DogF

I

Barometerbar miles shaft drive Gal Hp-hr Lit gal Cool- maa ofpull

\per speed Wheels per

lper

lper per. ing

lAir mercury

Ib hr rpm % hour- ~ hp-hr hour med

TIRES, WHEELS AND WEIGHTTests F, G, & H Test J Test K

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NEBRASKA TRACTOR TEST NO. 528

JOHN DEERE 70 DIESEL

FUEL, OIL and TIME Diesel Fuel Cetane No. 50(rating taken from oil company's typical inspectiondata): Weight per gallon 7.045 lb OIL SAE 20;to motor 2.434 gal; drained from motor 2.311 galTotal time motor was operated 44 hours.

CHASSIS Type Tricycle Serial No. 7017500 Treadwidth rear 60" to 88" front 85/16" and 121/16"Wheel base 91:' Hydraulic control system directengine drive with throw out lever Advertised speedsmph first 2.5 second 3.5 third 4.5 fourth 6.5 fifth8.75 sixth 12.5 reverse 3.25 Belt pulley diam. 121s"face 7 %" rpm 1125 Belt speed 3792 fpm Clutchmultiple dry disc operated by hand lever Seat up-holstered seat with back rest Brakes internal expand-ing shoe operated by two foot pedals Equalized noPower take-off direct engine drive with independentclutch Steering aided by hydraulic power steering.

ENGINE Make John Deere Diesel Type 2 cylinderhorizontal Serial No. 7017500 Crankshaft mountedcrosswise Head I Lubrication pressure Bore and stroke6 ~~" x 6 %" Rated rpm 1125 Compression ratio 16to 1 Displacement 376 cu. in. Port diameter valvesinlet 2.062 exhaust 1.653 Governor variable speedcentrifugal Ignition system battery Starting system 6volt battery Air cleaner oil washed wire mesh Muff-ler was used Oil filter replaceable impregnated paperelement Cooling medium temperature control therm-ostat Fuel filter brass wire screen in sediment bowland 2 replaceable impregnated paper elements.

STARTING ENGINE Make John Deere Type 4cylinder "V" Bore and stroke 2" x 1Yz" Displace-ment 18.85 en in Rated rpm 5500 Ignition batteryStarter 6 v~lt-battery.

REPAIRS AND ADJUSTMENTS No repairs oradjustments.

REMARKS All test results were determined fromobserved data and without allowances, additions ordeductions. Tests Band F were made with fuelpumps as set by the manufacturer and data fromtl,ose tests were used in determining the horsepowerto be developed in tests D and H, respectively. TestsC, D, E, G, H, J & K were made with the samesetting.

HORSEPOWER SUMMARY

Drawbar. .Belt1. Sea level (calculated) maximum

horsepower (based on 60°F and29.92" HG) 45.66 51.49

2. Observed maximum horsepower(tests F and B) 44.57 50.40

3. Seventy-five per cent of calcula-ted maximum drawbar horsepowerand eighty-five per cent of calcula-ted maximum belt horsepower(formerly ASAE and SAE ratings) 34.25 43.77

We, the undersigned, certify that this is a trueand correct report of official tractor test No. 528.

L. F. LA"RSENEngineer-in-charge

C. W. SMITHL. W. HURLBUTF. D. YUNG

Board of Tractor TestEngineers

TESTS F & G-I00% MAXIMUM LOAD

36.08 I 6189 I 2.19 I 1125 i 15.85 I Not Recorded I 135 1 56 I 29.150

44.50 I 4941 I 3.38 I 1125 I 8.35 I Not Recorded. . . .. I 160 1 53 1 29.00544.57 I 3687 1 4.53 I 1125 I 5.86 I Not Recorded .. I 160 1 53 1 29.00545.09 I 2589 I 6.53 I 1124 I 4.30 I Not Recorded. . . I 158 1 53 I 29.005

44.04 I 1840 I 8.98 I 1126 1 3.05 I Not Recorded1 156 I 50 I 28.990

42.71 I 1243 I 12.88 I 1126 I 1.55 I ..... Not Recorded. .. . I 158 I 53 1 28.990TEST H-RATED LOAD-TEN HOURS-3rd Gear

34.79 I 2831 I 4.61 I 1125 I 4.33 I 2.204 I 15.78 I 0.446 1 0.00 I 154 I 61 I 28.991TEST J-OPERATING MAXIMUM LOAD-3rd Gear

42.42 I 3584 I 4.44 I 1126 I 7.50 I ..... Not Recorded. . . .. I 158 I 55 I 29.180TEST K--OPERATING MAXIMUM LOAD-3rd Gear

41.15 I 3745 I 4.12 I 1125 I 11.56 1 ... Not Recorded I 157 I 60 1 29.1.80

Rear wheelsType Cast iron Cast iron Cast iron

Liquid ballast 800 lb each NODe None

Added cast iron 1 O lb each None None

Rear tiresNo. and size Two 13-38 Two 13-38 Two 12-38

Ply 6 6 6

Air pressure 16 lb 12 lb 12 lb

Front wheelsType Pressed steel Pressed steel Pressed sted

Liquid ballast None None NoneAdded cast iron None None None

Front tiresNo. and size Two 6.00-16 Two 6.00-l6 Two 6.00-16

Ply 4 4 4

Air pressure 28 lb 28 lb 28 lb

Height of drawbar 18 Y; inches 19 inches 18 inches

Static weightRear end 6683 lb 4803 lb 4754 Ib

Front end 2170 lb 2159 lb 2150 lb

Total weight as testedwith operator 9028 lb 7137 lb 7079 lb

EXPLANATION OF TEST REPORT

TEST A: The manufacturer's representative operates thetractor for a minimum of 12 hours using light to heavy draw-bar loads in each gear.

This serves as a period for limber up, general observationand adjustments. Adjustments that are permissible includevalve tappet clearance, breakl!r point gap, spark plug gaps,clutch and others of a similar nature. No new parts or acces-sories can be installed without having mention made of it inthe report.

No data are recorded during this preliminary run exceptthe time that the engine is operated.

BELT HORSEPOWER TESTS

TEST B: The throttle valve is held wide open, and thebelt load on the dynamometer is adjusted so that the engineis at the rated speed recommended by the manufacturer. Car-buretor, ignition timing and manifold adjustments are all setfor maximum engine power.

This test is designed to determine maximum belt horse-power of the tractor at rated speed and to measure fuel con-sumption at the maximum power on the belt.

TEST C: For tractors with carburetors the best fuel econ-

omy does not always occur when the engine develops maxi-mum power at rated speed. Test C is intended to allow themanufacturer's representative to select a more economical fuel~etting even though there is a slight loss of power. This morepractical carburetor setting is used in all later tests except testF. The throttle v;l.lve is held wide open and load adjusted togive rated rpm. Tests Band C are the same for diesel tractorswhich have an altogether different fuel system.

TEST D: The throttle control lever is set so that the gov-ernor will maintain rated engine speed when rated load isapplied. Rated load is 85% of 100% maximum, as obtained intest B, corrected to standard conditions.

This rating is somewhat less than the maximum belt horse-power in order that the operator may have a certain amountof reserve.

TEST E:

Varying load serves to show the range of engine speedswhen the engine is controlled by the governor during the fol-lowing varied loads of 20 minutes each: rated load, no load,Yz rated load, maximum load at wide open throttle valve,1.1 and % rated load.

The average result of this test shows the average powerand fuel consumption. Since the average tractor is subjectedto varying loads, these data serve well in predicting fuel con-sumption and efficiency of a tractor in general use.

Torque, lb-ft at dynamometer, is obtained with wide openthrottle and sufficient load is applied to give several readings.

DRA WEAR HORSEPOWER TESTS

In all drawbar tests the pull exerted by the tractor is trans-mitted by ;I.hydraulic pressure cylinder to a recording instru-ment in the test car. All tests are made on the same dirt testcourse which is maintained by grading, sprinkling and rolling

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so that it remains very nearly the same throughout the season.The same tires, wheels and weights are used for all tests exceptJ and K.

TEST F: A drawbar test, the results of which are used todetermine the rated drawbar horsepower in test H. The car-buretor is set to develop maximum power as in test B. Therated gear recommended by manufacturer as plow gear isused in this test. The drawbar load is adjusted to give ratedengine speed.

TEST G: Maximum drawbar horsepower is determined ineach gear when the carburetor is set for fuel economy as intest C. The throttle valve is held wide open and the load isapplied so that the engine runs at rated engine speed.

'When operating in low gear it is not uncommon for thetractor to develop less drawbar horsepower than in rated gearbecause of excessive wheel slippage. When excessive wheelslippage occurs the load is reduced until slippage approaches16%. When the load is reduced it is necessary to operate thetractor engine at part throttle and control engine speed bygovernor action.

TEST H: Intended to test the ability of the tractor to runcontinuously for 10 hours at rated drawbar horsepower andto determine the fuel consumption during that time. Rateddrawbar horsepower is 75% of 100% maximum drawbar horse-power (Test F), corrected to standard conditions.

When operating at rated load the throttle control lever isset to maintain rated engine speed. This rating is less thanmaximum drawbar horsepower in order that the operator mayhave a certain amount of reserve.

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TEST J: The tractor is operated in rated gear with all addedweight removed. This test shows the effect of the removal ofadded weight on the performance of the tractor when com-pared with test G .

Removal of wheel weights generally increases wheel slip-page and decreases drawbar horsepower.

TEST K: Similar to test J except that the smallest tiresand lightest wheels offered by the manufacturer are used.

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