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

1-1-1956

Test 594: John Deere 720/730 DieselTractor Test MuseumUnivesity of Nebraska

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The Experiment StationUniversity of Nebraska College of AgricultureW. V. Lambert, Director, Lincoln, Nebraska

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Department of Agricultural EngineeringDates of test: September 18, 1956 to September 22, 1956Manufacturer: JOHN DEERE WATERLOO

TRACTOR WORKS OF DEERE MANU-FACTURING CO., WATERLOO, tOWA

Manufacturer's rating: Not rated

BELT HORSEPOWER TESTS

I

Crank

1

Fnel Consnmption

I

Temp. Deg. F.

1

Barometershaft Air Air inches ofspeed Gal

I

Hp-hr I Lb per Cool.ingI

wetI

dry mercnryrpm per hr per gal I hp-hr med,nm bnlb bulb

TEST B & G-1O0% MAXIMUM LOAD-TWO HOURS

56.66 I 1125 1 3.153 1 17.97 I 0.390 1 162 I 53 I 62 1 28.865TEST D-RATED LOAD-ONE HOUR

50.16 I 1124 1 2.737 1 18.33 1 0.383 1 156 1 50 I 60 1 28.868TEST E-VARYING LOAD-TWO HOURS (20 minute runs; last line average)

50.09 1 1125 I 2.732 1 18.33 1 0.383 1 155 1 51 1 61 1

2.01 I 1218 1 0.658 1 3.05 1 2.299 1 125 I 50 I 59 1

26.38 1 1176 I 1.625 1 16.23 1 0.432 1 118 1 50 1 60 I52.33 1 1114 1 2.848 1 18.37 1 0.382 1 154 1 51 1 60 1

13.60 I 1208 1 1.120 I 12.14 1 0.578 1 133 1 51 I 60 1

38.72 1 1154 I 2.147 1 18.03 I 0.389 1 140 I 50 1 60 1

30.52 I 1166 I 1.855 1 16.45 1 0.426 1 137 I 50 1 60 t 28.875TEST L-OPERATING MAXIMUM TORQUE

% of rated rpm (engine) I 100 1 95 1 90 1 85 I 79 I 75 I 70 1 65 I% of rated-speed torque 1 100 1 108 I 112 1 112 1 114 I 115 I 116 I 116 I

Hp

60 1 541l3TTil

Rp I ~ I

DRA WBAR HORSEPOWER TESTS_

I 1

SI"

1 I

-

I

Speed Crank ~f hel Consnmption Temp. Deg. F. Barometermil.. .haft drive Gal

I

Hp-hr

\

Lb cool-

I

Air

I

Air inches ofper ,peed wheel. per per per ing wet dry mercnryhr rpm % hr gal hp-hr moo bnlb bulb

TEST H-RATED LOAD-TEN HOURS-4th Gear

4.29 I 1125 I 5.12 I 2.440 I 16.56 I 0.424 1 180 1TEST F & G-lOO% MAXIMUM LOAD

1.19 1 1128 I 16.30 list gear (part throttle) I 140 1

1.97 1 1126 1 14.23 I 2nd gear (part throttle) I 130 I3.23 I 1125 I 10.97 I 3rd gear .1 176I4.17 1 1126 1 7.85 i 4th gear I 172 1

5.53 1 1126 I 5.26 15th gear 1 171 I

11.23 I 1125 1 2.23 16th gear. 1 164 1TEST J-OPERA TING MAXIMUM LOAD

4.15 1 1126 I 7.93 14th gear I 175 1TEST K-OPERATING MAXIMUM LOAD

3.95 1 1127 I 12.17 14th gear. 1 174 I

40.41 1 35-32 1

20.83 I6547l33.91 I 6442 I48.44 1 5633 1

51.66 1 4644 1

50.241 3405 1

47.58 ~

51.83 1 4686 I

49.25 f468ol

63 I 87

54 j 6752T6559T7553l635sT6759 1 75

56 ] 74

54 j 69

I 28.820I 28.820

1 28.8301 28.8901 28.8651 2£.830

I28.870

! 28.850

I 28.443

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

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NEBRASKA TRACTOR TEST NO. 594

JOHN DEERE 72Q DIESEL

FUEL, OIL, WATER and TIME Fuel DieselCetane No. 50 (rating taken from oil company's typ-ical inspection data) Weight per gallon 7.016 Ib OilSAE 10 To motor 2.538 gal Drained from motor2.365 gal Water used none Total time motor wasoperated 451i hours.

CHASSIS TYPE Tricycle Serial No. 7200022 Treadwidth 60" to 88" front 8 5/16" and 12 1/16"Wheel base 90 15/16" Hydraulic control system di-rect engine drive with throw out lever Advertisedspeeds mph first 1Yz second 2 Y. third 3 Yz fourth4 Yz fifth 5 Y. sixth 111i reverse 3 Yz Belt pulley diam12%" Face 7%" rpm. 1125 Belt speed 3792 fpmBelt fIat Length 72' Width 7" Thickness 0.216"Maximum slip 1.00% Clutch double disc dry typeoperated by hand lever Seat upholstered seat cush-ioned by rubber in torsion Brakes internal expand-ing shoe operated by two foot pedals ~ualized noPower take-off direct engine drive with independentclutch Steering aided by hydraulic power steering.

ENGINE Make John Deere Type 2 cylinder hori-zontal Diesel Serial No. 7200022 Crankshaft mountedcrosswise Head I Lubrication pressure Bore and stroke6Ys" x 6%" Rated rpm 1125 Compression ratio 16to 1 Displacement 376 cu. in. Port Diameter valvesinlet 2.187" exhaust 1.655" Governor variable speedcentrifugal Air cleaner oil washed wire mesh Mufflerwas used Oil filter replaceable impregnated paper ele-ment Fuel filter brass wire screen in sediment bowland 2 replaceable impregnated paper elements Cool-ing medium temperature control thermostat.

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

REPAIRS AND ADJUSTMENTS, No repairs-or ad-justments.

REMARKS All test results were determined fromobserved data and without allowances, additions ordeductions. Tests Band F were made with a 'fuelpump setting, selected by the manufacturer to de-velop approximately 58.8 corrected maximum belthorsepower and data from these tests were used indetermining the horsepower to be developed in testsD and H, respectively. Tests C, D, E, G, H, J, K,and L were made with the same setting.

HORSEPOWER SUMMARY

Drawbar Belt1. Sea level (calculated) maximum

horsepower (based on 600 F and29.92" Hg) , 53.66 58.84

horsepower2. Observed maximum(tests F and B)

3. Seventy-five per cent of calculatedmaximum drawbar horsepower andeighty-five per cent of calculatedmaximum belt horsepower (ASAEand SAE ratings) 40.25

51.66 56.66

50.01

We, the undersigned, certify that this is a trueand correct report of official Tractor Test No. 594.

L. F. LARSENEngineer-in-Charge

L. W. HURLBUTG. W. STEINBRUEGGET. J. SULEK

Board of TractorTest Engineers

Rear wheelsType Cast iron Cast iron Cast iron

Liquid ballast 669 Ib each None None

Added cast iron None None None

Rear tiresNo. and size Two 15.5-38 Two 15.5-38 Two 13.6-38

Ply 6 6 6

Air pressure 181b 141b 161b

Front wheelsType Pressed steel Pressed steel Pressed steel

Liquid ballast None None None

Added cast iron None None None

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

Ply 6 6 6

Air pressure 361b 361b 361b

Height of drawbar 17 inches 17 Yz inches 17 Yz inches

Static weightRear end 7020 Ib 5682 lb 5646 Ib

Front end 2046 Ib 2042 Ib 2040 lb

Total weight as testedwith operator 9241 lb 7899 Ib 7861 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 permissable includevalve tappet clearance, breaker 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 wide open and the belt loadon the dynamometer is adjusted so that the engine is at therated speed recommended by the manufacturer. Carburetor,ignition ti.ming and manifold adjustments are all set for maxi-mum engme 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-onmy 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 fuelsetting even though there is a slight loss of power. This morepractical carburetor setting is used in all later tests except testF. The throttle valve is wide open and load adjusted to giverated 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,Y4 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 COIJ-sumption and efficiency of a tractor in general use.

TEST L: This torque test is run with wide open throttle.Loads are applied to reduce engine speed in approximately ten5% increments. Rated speed equals 100%. The correspondingdynamometer torque is recorded as a per cent of torque at ratedspeed.

DRAWBAR HORSEPOWER TESTS

In all drawbar tests the pull exerted by the tractor is trans-mitted by a hydraulic pressure cylinder to a recording instru-

ment in the test car. When rubber tires are used, all tests aremade on the concrete test course. All crawler type tractors aretested on a dirt test course which is maintained by grading,sprinkling and rolling so that it remains very nearly the samethroughout the season. The same tires,' wheels and weightsare used for all tests except J 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 ~et 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 the

tractor 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 stand:ud 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 decreasesdrawbar horsepower.

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

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