Compare/John Deere 4840 vs John Deere 6M 185

John Deere 4840 vs John Deere 6M 185

Verdict: John Deere 4840 vs John Deere 6M 185

The John Deere 4840 and the John Deere 6M 185 are both tractors — here is how they stack up on the figures that matter. John Deere 6M 185 leads on rated power with 182 hp against 181 hp. John Deere 4840 is the lighter machine (14,900 kg vs 17,196 kg), which helps on soft ground and transport, while the heavier model carries more ballast for traction-limited draft work. John Deere 6M 185 is the newer design (2024 vs 1978). In short: choose the John Deere 6M 185 for outright pulling power, or the John Deere 4840 if a tighter budget and lighter footprint matter more. Compare the full spec tables below before booking a demo.

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Tell us about your operation

Acreage600 acBudgetMain crop / use

Fit & specs

John Deere

Fit score

Best match

Clear

John Deere

Fit score

Best match

Clear

Rated power

181 hp

182 hp

Confidence

98%

Guide price

—

Overview

Manufacturer

John DeereReference

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

liquid-cooled inlineReference

Differential lock

pedal-actuated hydraulicReference

electro-hydraulicReference

Final drives

—

planetaryReference

Engine

Drawbar (claimed)

117.1 kWReference

—

Drawbar (tested)

112.8 kWReference

—

Displacement

7.6 LReference

6.8 LReference

Bore/Stroke

116 x 121 mmReference

106 x 127 mmReference

Air cleaner

dual paper elementsReference

—

Pre-heating

ether injectionReference

—

Compression

15.5:1Reference

—

Rated RPM

2200Reference

2100Reference

Idle RPM

800-2400Reference

—

Operating RPM

1500-2200Reference

—

Firing order

1-5-3-6-2-4Reference

—

Starter volts

12Reference

Coolant capacity

37.9 LReference

—

Power at rated engine speed

134.7 kWReference

—

Max power

112.8 kWReference

—

Fuel Type

DieselReference

—

No of Cylinders

6-cylinderReference

—

Rated engine speed

2,200 | 1,500-2,200 RPMReference

—

Bore and stroke

4.5,625x4.75 inchesReference

—

Compression ratio

15.5:1Reference

—

Cooling system

liquid-cooled | 40 qtsReference

—

Fuel tank

—

285.0 LReference

Exhaust fluid (DEF)

—

23.5 LReference

Engine (gross)

—

136.0 kWReference

Engine (max)

—

150.0 kWReference

Emissions

—

Tier IVReference

Rated Power (gross)

—

136.0 kWReference

Maximum Power (gross)

—

150.0 kWReference

Torque

—

865.1 NmReference

Torque RPM

—

1600Reference

Starter

—

electricReference

Transmission

John Deere PowerShiftReference

AutoPowr IVTReference

Gears

8 forward and 4 reverseReference

infinite forward and reverseReference

Oil capacity

75.7 LReference

—

forward and reverse options

8 forward and 4 reverseReference

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PTO & Hydraulics

PTO (claimed)

134.2 kWReference

108.9 kWReference

PTO (tested)

134.7 kWReference

—

Hydraulic system

62.5 LReference

—

Type

full power shiftReference

infinitely variable transmissionReference

Capacity

62.5 LReference

—

Valves

2 or 3Reference

—

Pump flow

87.1 lpmReference

155.2 lpmReference

Rear Type

III/IIINReference

Rear lift

3762 kgReference

—

Rear PTO

independentReference

Rear PTO Type

1000 (1.75)Reference

540/1000 (1.375)Reference

Power at rated PTO speed

135.4 kWReference

—

Rear valves

—

0 to 3Reference

Mid valves

—

2 to 4Reference

Rear lift (at 24"/610mm)

—

3946 kgReference

Front Hitch

—

IIINReference

Front lift

—

3297 kgReference

Clutch

—

electro-hydraulic wet discReference

Engine RPM

—

1000@1969Reference

Front PTO

—

independentReference

Front PTO Type

—

1000 (1.375)Reference

Capacities

Fuel

389.9 LReference

—

Dimensions

Wheelbase

300 cmReference

276 cmReference

Weight

14900 to 18000 poundsReference

8000 kgReference

Front tire

11.00-16Reference

420/85R28Reference

Rear tire

18.4-38Reference

480/80R42Reference

Ag front

9.50-20Reference

—

Ag rear

18.4-42Reference

—

Length

449 cmReference

473 cmReference

Width

299 cmReference

254 cmReference

Height (cab)

297 cmReference

—

Clearance (front axle)

66 cmReference

53 cmReference

Clearance (rear axle)

71 cmReference

—

Clearance (drawbar)

37 cmReference

—

Rack-and-pinion rear axle

99 by 2997 mmReference

—

Front tread

147 to 254 cmReference

—

Rear tread

152 to 334 cmReference

—

Shipping

6758 kgReference

—

Operating

8164 kgReference

—

Ballasted

9239 kgReference

—

Standard tires (ag)

—

Front: 420/85R28. Rear: 480/80R42Reference

Height

—

297 cmReference

Shipping weight

—

7800 kgReference

4840 Serial Number Location

4840 Serial Numbers

1978

1000Reference

—

1979

4233Reference

—

1980

7539Reference

—

1981

11042Reference

—

1982

14933Reference

—

Electrical

Ground

negativeReference

Charging system

alternatorReference

Batteries

2Reference

—

Battery volts

6Reference

12Reference

Battery options

2 | 2Reference

—

Charging amps

—

250Reference

Test results

Fuel use

42.8 l/hourReference

—

Max pull

7850 kgReference

—

General

Make & Model

John DeereReference

—

PTO

Rear PTO Power

AvailableReference

—

Rear PTO RPM

1,000 (1.75)Reference

—

Hydraulics

Hydraulics Type

closed centerReference

—

Remote Valves

2 or 3Reference

—

Rear Hitch category (SAE designation)

Category III/IIINReference

—

Dimensions & weight

Height Over Cab

297.2 cmReference

—

Overall Height

297.2 cmReference

—

Overall Length

449.6 cmReference

—

Overall Width

243.8 cmReference

—

Drawbar clearance

37.8 cmReference

—

Front axle clearance

66 cmReference

—

Wheels & tyres

Rear wheel tread range

18.4-38, 24.5-32, 30.5-32, 20.8-38, 18.4-42 inchReference

—

Front Wheel tread range

11.00-16, 10.00-16, 14L-16.1, 16.5L-16.1, 9.50-20Reference

—

John Deere 6M 185 attachments

Attachment overview

Fit score weighs budget, operation size, crop match and data confidence against the details above. It’s guidance, not advice — always confirm with a dealer demo.