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John Deere 6M 185 vs John Deere 8440

Verdict: John Deere 6M 185 vs John Deere 8440

The John Deere 6M 185 and the John Deere 8440 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 180 hp. John Deere 8440 is the lighter machine (12,061 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 1979). In short: choose the John Deere 6M 185 for outright pulling power, or the John Deere 8440 if a tighter budget and lighter footprint matter more. Compare the full spec tables below before booking a demo.

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Fit & specs
John Deere 6M 185 Tractor
John Deere
94
Fit score
Best match
Clear
John Deere 8440 Tractor
John Deere
94
Fit score
Best match
Clear
Rated power
182 hp
180 hp
Confidence
98%
98%
Guide price
Overview
Manufacturer
John DeereReference
John DeereReference
liquid-cooled inlineReference
With 18.4-38 tires.Reference
Final drives
planetaryReference
Differential lock
electro-hydraulicReference
hydraulic front and rearReference
Engine
Fuel tank
285.0 LReference
Exhaust fluid (DEF)
23.5 LReference
Engine (gross)
136.0 kWReference
Engine (max)
150.0 kWReference
Displacement
6.8 LReference
7.6 LReference
Bore/Stroke
106 x 127 mmReference
116 x 121 mmReference
Emissions
Tier IVReference
Rated Power (gross)
136.0 kWReference
Maximum Power (gross)
150.0 kWReference
Rated RPM
2100Reference
2100Reference
Torque
865.1 NmReference
Torque RPM
1600Reference
Starter
electricReference
Starter volts
12Reference
12Reference
Engine
160.3 kWReference
Drawbar (tested)
119.7 kWReference
Power
160.3 kWReference
Compression
15.5:1Reference
Idle RPM
800-2300Reference
Operating RPM
1500-2100Reference
Firing order
1-5-3-6-2-4Reference
Oil capacity
151.4 LReference
Coolant capacity
37.9 LReference
Power at rated engine speed
134.1 kWReference
Max power
119.7 kWReference
Transmission
Transmission
AutoPowr IVTReference
John Deere Quad-RangeReference
Type
infinitely variable transmissionReference
partial power shiftReference
Gears
infinite forward and reverseReference
16 forward and 6 reverseReference
PTO & Hydraulics
PTO (claimed)
108.9 kWReference
130.5 kWReference
Rear valves
0 to 3Reference
Mid valves
2 to 4Reference
Pump flow
155.2 lpmReference
124.9 lpmReference
Rear Type
III/IIINReference
IIIReference
Rear lift (at 24"/610mm)
3946 kgReference
Front Hitch
IIINReference
Front lift
3297 kgReference
Rear PTO
independentReference
independentReference
Clutch
electro-hydraulic wet discReference
hydraulic wet discReference
Rear PTO Type
540/1000 (1.375)Reference
1000Reference
Engine RPM
1000@1969Reference
Front PTO
independentReference
Front PTO Type
1000 (1.375)Reference
PTO (tested)
134.1 kWReference
Hydraulic system
151.4 LReference
Capacity
151.4 LReference
Valves
2Reference
Rear lift
3876 kgReference
Dimensions
Wheelbase
276 cmReference
317 cmReference
Weight
8000 kgReference
12061 kgReference
Front tire
420/85R28Reference
18.4-34Reference
Rear tire
480/80R42Reference
18.4-34Reference
Standard tires (ag)
Front: 420/85R28. Rear: 480/80R42Reference
Length
473 cmReference
567 cmReference
Width
254 cmReference
Height
297 cmReference
Shipping weight
7800 kgReference
Clearance (front axle)
53 cmReference
Ag front
18.4-34Reference
Ag rear
18.4-34Reference
Operating weight
12061 kgReference
Ground clearance
49 cmReference
Front axle
99 by 3007 mmReference
Rack-and-pinion rear axle
99 by 3007 mmReference
Front tread
160 to 330 cmReference
Rear tread
160 to 330 cmReference
John Deere 6M 185 attachments
Electrical
Ground
negativeReference
negativeReference
Charging system
alternatorReference
alternatorReference
Charging amps
250Reference
90Reference
Battery volts
12Reference
6Reference
Batteries
2Reference
Battery CCA
850Reference
Attachment overview
Capacities
Fuel
590.5 LReference
8440 Serial Number Location
8440 Serial Numbers
1979
1000Reference
1980
2266Reference
1981
3758Reference
1982
5235Reference
John Deere 8440 Height
Hood
221 cmReference
Cab
321 cmReference
Exhaust
341 cmReference
Test results
Fuel use
42.4 l/hourReference
Max pull
11513 kgReference
Speeds

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.

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