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

January 1996

Test 941: John Deere 3020 Syncro-Range Gas Test 941: John Deere 3020 Syncro-Range Gas

Nebraska Tractor Test Lab University of Nebraska-Lincoln, tractortestlab@unl.edu

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NEBRASKA TRACTOR TEST 941-JOHN DEERE 3020 SYNCRO-RANGE GASOLINE

POWER TAKE-OFF PERFORMANCE

Hp

MAXIMUM POWER AND FUEL CONSUMPTION

70.59Rated Engine Speed-Two Hours

6.620 0.578 10.66 169 68 752500 28.930

64.74Standard Power Take-off Speed (1000 rpm)-One Hour

2072 5.999 0.571 10.79 170 69 75 28.930

VARYING POWER AND 'FUEL CONSUMPTION-TWO HOURS

VARYING DRAWBAR PULL AND TRAVEL SPEED WITH BALLAST-4th Gear

Pounds pullHorsepowerCrankshaft speed, rpmMiles per hourSlip of drivers, %

475862.7925014.956.99

503559.5022524.437.25

TIRES, BALLAST, and WEICHT

Rear tires -No, size, ply & psiBallast -Liquid

Cast iron

-No, size, ply & psi-Liquid

Cast iron

With Ballast

Two 15.5-38; 8; 20715 lb each280 lb eachTwo 6.00-16; 6; 36None39 Ib each

18Y2inches7790 Ib2035 Ib9825 Ib

Without Ballast

Two 15.5-38; 8; 14NoneNoneTwo 6.00-16; 6; 32NoneNone

18Y2inches5800 Ib19601b7760 Ib

Front tiresBallast

Height of drawbarStatic weight with operator-Rear

FrontTotal

Department of Agricultural Engineering

Dates of Test: MAY 31 TO JUNE 7, 1966

Manufacturer: JOHN DEERE WATERLOOTRACTOR WORKS, WATERLOO, IOWA

FUEL, OIL and TIME Fuel regular gasolineOctane No Motor 84.5 Research 92..6 (ratingtaken from oil company's typical inspection data)Specific gravity converted to 600/600 0.7404Weight per gallon 6.163 Ib Oil SAE 20-20W APIservice classification MS, DG To motor 1.616 galDrained from motor 1.436 gal Transmission andfinal-drive lubricant John Deere Special 303 oilTotal time engine was operated 39Y2 hours.

ENGINE Make John Deere gasoline Type4 cylinder vertical Serial No IIE92030 Crank-shaft mounted lengthwise Rated rpm 2500 Boreand stroke 4~" x 4" Compression ratio 7.5 to IDisplacement 227 en in Carburetor size 1%"Ignition system battery Cranking system 12 voltelectric Lubrication pressure Air cleaner drytype with replaceable paper element Oil filterfull flow replaceable paper element Oil coolerradiator for transmission and hydraulic oil Fuelfilter screens in carburetor and fuel pumpMuffler was used Cooling medium temperaturecontrol thermostat.

CHASSIS Type Tricycle Serial No SNTIII-R09226SR Tread width rear 60" to 91" front8.75" or 18.50" Wheel base 90" Center of gravity_' ~._.(without operator or ballast, with minimum~-tread, with fuel tank filled and tractor servicedfor operation) Horizontal distance forward fromcenter-line of rear wheels 26" Vertical distanceabove roadway 38" Horizontal distance from cen-ter of rear wheel tread 0" to the right/leftHydraulic control system direc~ engine driveTransmission selective gear fixed ratio with par-tial range syncro-mesh Advertised speeds mphfirst 2 second 3 third 4 fourth 5~ fifth 6Y2 sixth8\12 seventh 10% eighth 17Y2 reverse (at 2100rpm) first 3~ second 5~ Clutch single plate drydisc operated by foot pedal Brakes wet disc hy-draulically power actuated operated by two footpedals which can be locked together Steeringhydraulic with power assist Turning radius (onconcrete surface with brake applied) right 101"left 101" (on concrete surface without brake)right 113" left 113" Turning space diameter (onconcrete surface with brake applied) right 243Y2"left 243\12" (on concrete surface without brake) --right 287" left 287" Belt pulley 978 rpm at 2100/-'"engine rpm cIiam 12.0" face 8.5" Belt speed 3074fpm Power take-off 1016 rpm at 2100 enginerpm.

REPAIRS and ADJUSTMENTS No repairsor adjustments.

REMARKS All test results were determinedfrom observed data obtained in accordance withthe SAE and ASAE test code.

First gear was not run as it was necessary tolimit the pull in second gear to avoid excessivewheel slippage. Eighth gear was not run as itexceeded 15 mph.

We, the undersigned, certify that this is a trueand correct report of official Tractor Test 941.

L. F. LARSEN

Engineer-in-ChargeG. W. STEINBRUEGGE, ChairmanJ. J. SULEKD- E. LANE

Board of Tractor Test Engineers

The University of Nebraska Agricultural Experiment StationE. F. Frolik, Dean; H. H. Kramer, Director; Lincoln, Nebraska

Fuel Consumption Temperature Degrees FCrank- Barometershaft Gal Lb Hp-hr Air Air inches ofspeed per per per Cooling wet dry Mercuryrpm hr hp-hr gal medium bulb bulb

61.76 2583 6.401 0.639 9.65 170 70 760.00 2683 2.444 164 69 75

31.42 2618 4.435 0.870 7.08 168 70 7670.67 2500 6.620 0.577 10.68 172 70 7615.87 2656 3.500 1.359 4.53 166 70 7646.58 2582 . 5.437 0.719. 8.57 170 72 78

Av 37.72 2603 4.806 0.785 7.85 168 70 76 28.907

DRA WBAR PERFORMANCE

Fuel Consumption Temp DegreesFDraw- Speed Crank- Slip Barom.

Hp bar miles shaft of Gal Lb Hp-hr Cool- Air Air eterpull per speed drivers per per per ing wet dry inchesofIbs hr rpm % hr hp-hr gal med bulb bulb Mercury

VARYING DRA WBAR POWER AND FUEL CONSUMPTION WITH BALLAST

Maximum Available Power-Two Hours-4th Gear61.38 4634 4.97 2491 6.26 6.225 0.625 9.86 175 72 85 28.728

75% of Pull at Maximum Power-Ten Hours-4th Gear50.04 3568 5.26 2596 4.73 5.649 0.696 8.86 172 71 81 28.791

50% of Pull at Maximum Power-Two Hours-4th Gear34.42 2400 5.38 2612 3.16 4.473 0.801 7.70 170 69 79 28.730

MAXIMUM POWER WITH BALLAST

55.52 7558 2.75 2558 14.98 2nd Gear .............. 177 72 83 28.79060.50 6085 3.73 2501 9.73 3rd Gear.. 175 71 81 28.84062.79 4758 4.95 2501 6.99 4th Gear .." "'" 175 70 82 28.82063.29 3858 6.15 2501 5.32 5th Gear .... 177 70 82 28.82063.04 2823 8.37 2501 3.94 6th Gear ..""" 176 71 84 28.82061.79 2194 10.56 2500 2.95 7th Gear ... 176 71 84 28.820

MAXIMUM POWER WITHOUT BALLAST

60.81 4824 4.73 2498 ILl I 4th Gear.. 170 64 80 28.900

5305 5449 5204 520755.36 49.26 40.56 33.911999 1739 1491 12473.91 3.39 2.92 2.448.03 8.29 7.77 8.03

EXPLANATION

GENERAL CONDITIONS

Each tractor is a production model equipped for com-mon usage. Power consuming accessories can be -discon-nected only when it is convenient for the operator to doso in practice. Additional weight can be added as ballastif the manufacturer regularly supplies it for sale. Thestatic tire loads and the inflation pressures must conformto recommendations in the Tire Standards published bythe Society of Automotive Engineers.

PREPARATION FOR PERFORMANCE RUNS

The, engine crankcase is drained and refilled with ameasured amount of new oil conforming to specificationsin the operators manual. The fuel used and the mainte-nance operations must also conform to the publishedinformation delivered with the tractor. The tractor is

then limbered-up for 12 hours on drawbar work in ac-cordance with the manufacturer's published recommend-ations. The manufacturer's representative is present tomake appropriate decisions regarding mechanical adjust-ments.

The tractor is equipped with approximately theamount of added ballast that is used during maximumdrawbar tests. The tire tread-bar height must be at least65% of ,new tread height prior to the maximum powerrun. -

BELT OR POWER TAKE-OFF-PERFORMANCE

Maximum Power and Fuel Consumption. The manu-facturer's repr~sentative makes carburetor, fuel pump,ignition and governor control settings which remain un-changed throughout all subsequent runs. The governorand the manually operated governor control lever is setto provide the high-idle speed specified by the manufac-turer for maximum power. Maximum power is measuredby connecting the belt pulley or the power take-off to adynamometer. The dynamometer load is then graduallyincreased until the engine is operating at the rated speedspecified by the manufacturer for maximum power. Thecorresponding fuel consumption is measured.

Varying Power and Fuel Consumption. Six differenthorsepower levels -are used to show corresponding fuelconsumption'rates and how the governor causes the en-gine to react to the following changes in dynamometerload: 85% of the dynamometer torque at maximumpower; minimum dynamometer torque, .Y2 of the 85%torque; maximum power, y,j' and %of the 85% torque.Since a tractor is generally subjected to varying loads theaverage of the results in this test serve well for predictingthe fuel consumption of a tractor in general usage.

DRA WBAR PERFORMANCE

All engine adjustments are the same as those used inthe belt or power take-off tests. If the manufacturer speci-fies a different rated crankshaft speed for drawbar op-erations, then the position of' the manually operatedgovernor control is changed to provide the high-idlespeed specified by the manufacturer in the operatinginstructions.

Varying Power and Fuel Consumption With Ballast.The varying power runs are made to show the effect ofspeed-control devices (engine, goven;lQJ;; automatic trans-

/ -,,'.;

OF TESTREPORT

mission, etc.) on horsepower, speed and fuel consump-tion. These runs are made around the entire test coursewhich has two 180 degree turns with a minimum radiusof 50 feet. The drawbar pull is set at 3 different levels asfollows: (1) as near to the pull at maximum power aspossible and still have the tractor maintain the travelspeed at maximum horsepower on the straight sections ofthe test course; (2) 75% of the pull at maximum power;and (3) 50% of the pull at maximum power. Prior to1958, fuel consumption data (10 hour test) were shownonly for the pull obtained at maximum power for trac-tors having torque converters and at 75% of the pullobtained at maximum power for gear-type tractors.

Maximum Power with Ballast. Maximum power ismeasured on straight level sections of the test course.Data are shown for not more than 12 different gears ortravel speeds. Some gears or travel speeds may be omittedbecause of high slippage of the traction members or be-cause the travel speed may exceed the safe-limit for thetest course. The maximum safe speed for the NebraskaTest Course has been set at 15 miles per hour. The slip-page limits have been set at 15% and 7% for pneumatictires and steel tracks or lugs, respectively. Higher slip-page gives widely varying results.

Maximum Power Without Ballast. All added ballastis removed from the tractor. The maximum draw bar

_power of the tractor is determined by the same procedureused for getting maximum power with ballast. The gear(or travel speed) is the same as that used in the lO-hourtest.

"--/

Varying Power and Travel Speed with Ballast. Travelspeeds corresponding to drawbar pulls beyond the maxi-mum power range are obtained to show the "luggingability" of the tractor. The run starts with the pull atmaximum power; then additional drawbar pull is ap-plied to cause decreasing speeds. The run is ended byone of three conditions: (1) maximum pull is obtained,(2) the maximum slippage limit is reached, or (3) someother operating limit is reached.

For additional information about the Nebraska Trac-tor Tests write to the Department of Agricultural Engi-neering, University of Nebraska, Lincoln, Nebraska.

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John Deere 3020 Syncro-Range Gasoline