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Tractor · 1978Unverified

John Deere 4840

John Deere 4840 — Iron Horses Series · 181 hp. Reference specifications; pending source verification.

The John Deere 4840 is a tractor model with a rated output of 181 hp, positioning it among the higher-powered machines in its class. It was manufactured from 1978 to 1982. The tractor features a 6-cylinder turbocharged intercooled diesel liquid-cooled engine, driving through two-wheel drive with a powershift transmission. Its listed weight ranges from 14900 to 18000 pounds, and it is suitable for tasks covering approximately 600–1,500 acres.

Provisional listing — the headline figure is shown; full specifications are auto-generated and pending verification against published sources.

Rated power
181 hp
Max power
112.8 kW
Weight
14900 to 18000 pounds

Catalogue coverage

Variants represented
2
Richest spec table
119 rows
Recorded power
181 hp
Transmissions
8-speed full power shift
Production years
1978-1982
Verified variants
0

1 linked source document displayed

Hover a source tag to verify

Overview

ManufacturerJohn DeereReference
Row-Crop tractorReference
Built in Waterloo, Iowa, USAReference
Original price was $57,648 in 1982Reference
Two-wheel driveReference
Differential lockpedal-actuated hydraulicReference
Power steeringReference
Differential hydraulic wet disc brakesReference
Sound-Gard cab.Reference

Engine

John Deere 7.6L 6-cyl dieselReference
Drawbar (claimed)117.1 kWReference
Drawbar (tested)112.8 kWReference
John DeereReference
turbocharged intercooled dieselReference
6-cylinderReference
liquid-cooledReference
Displacement7.6 LReference
Bore/Stroke116 x 121 mmReference
Air cleanerdual paper elementsReference
Pre-heatingether injectionReference
Compression15.5:1Reference
Rated RPM2200Reference
Idle RPM800-2400Reference
Operating RPM1500-2200Reference
Firing order1-5-3-6-2-4Reference
Starter volts12Reference
Coolant capacity37.9 LReference
Power at rated engine speed134.7 kWReference
Max power112.8 kWReference
Fuel TypeDieselReference
No of Cylinders6-cylinderReference
Rated engine speed2,200 | 1,500-2,200 RPMReference
Bore and stroke4.5,625x4.75 inchesReference
Compression ratio15.5:1Reference
Cooling systemliquid-cooled | 40 qtsReference

Transmission

8-speed full power shiftReference
TransmissionJohn Deere PowerShiftReference
Typefull power shiftReference
Gears8 forward and 4 reverseReference
Oil capacity75.7 LReference
Clutchless shift-on-the-move power shift between all eight forward and four reverse gears. Inching pedal provided for hooking up implements and other precision work.Reference
forward and reverse options8 forward and 4 reverseReference

PTO & Hydraulics

PTO (claimed)134.2 kWReference
PTO (tested)134.7 kWReference
Hydraulic system62.5 LReference
Typeclosed centerReference
Capacity62.5 LReference
Valves2 or 3Reference
Pump flow87.1 lpmReference
Rear TypeIII/IIINReference
Rear lift3762 kgReference
Rear PTOindependentReference
Rear PTO Type1000 (1.75)Reference
Power at rated PTO speed135.4 kWReference

Capacities

Fuel389.9 LReference

Dimensions

Wheelbase300 cmReference
Weight14900 to 18000 poundsReference
Front tire11.00-16Reference
Rear tire18.4-38Reference
Ag front11.00-16Reference
Ag rear18.4-38Reference
Ag front10.00-16Reference
Ag front14L-16.1Reference
Ag front16.5L-16.1Reference
Ag front9.50-20Reference
Ag rear24.5-32Reference
Ag rear30.5-32Reference
Ag rear20.8-38Reference
Ag rear18.4-42Reference
Length449 cmReference
Width243 cmReference
Width274 cmReference
Width299 cmReference
Height (cab)297 cmReference
Clearance (front axle)66 cmReference
Clearance (rear axle)71 cmReference
Clearance (drawbar)37 cmReference
Rack-and-pinion rear axle99 by 2438 mmReference
Rack-and-pinion rear axle99 by 2743 mmReference
Rack-and-pinion rear axle99 by 2997 mmReference
Front tread147 to 254 cmReference
Rear tread152 to 334 cmReference
Shipping6758 kgReference
Operating8164 kgReference
Ballasted9239 kgReference

4840 Serial Number Location

Serial number plate on the rear of the 4840, above the PTO shaft.Reference

4840 Serial Numbers

19781000Reference
19794233Reference
19807539Reference
198111042Reference
198214933Reference
FAQ: How to read a serial number table.Reference

Electrical

GroundnegativeReference
Charging systemalternatorReference
Batteries2Reference
Battery volts6Reference
Battery options2 | 2Reference

Test results

Diesel 8-speed 2WDNovember 2 - 12, 1977Link: Nebraska Tractor Test 1263 fileReference
PTO performanceReference
Fuel use43.5 l/hourReference
Drawbar performanceReference
Fuel use42.8 l/hourReference
Gear 4 used for power test.Reference
Max pull7850 kgReference
Gear 2 used for pull test.Reference

General

Make & ModelJohn DeereReference

PTO

Rear PTO PowerAvailableReference
Rear PTO RPM1,000 (1.75)Reference

Hydraulics

Hydraulics Typeclosed centerReference
Remote Valves2 or 3Reference
Rear Hitch category (SAE designation)Category III/IIINReference

Dimensions & weight

Height Over Cab297.2 cmReference
Overall Height297.2 cmReference
Overall Length449.6 cmReference
Overall Width243.8 cmReference
Drawbar clearance37.8 cmReference
Front axle clearance66 cmReference

Wheels & tyres

Rear wheel tread range18.4-38, 24.5-32, 30.5-32, 20.8-38, 18.4-42 inchReference
Front Wheel tread range11.00-16, 10.00-16, 14L-16.1, 16.5L-16.1, 9.50-20Reference

Values normalized to UK metric units. Every figure is traced to at least one source; verified specs are cross-checked against two or more.

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