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John Deere 644D vs John Deere 850
Verdict: John Deere 644D vs John Deere 850
The John Deere 644D and the John Deere 850 are both industrial tractors — here is how they stack up on the figures that matter. Both are rated at the same 165 hp. John Deere 644D is the lighter machine (13,299 kg vs 14,787 kg), which helps on soft ground and transport, while the heavier model carries more ballast for traction-limited draft work. John Deere 644D is the newer design (1985 vs 1977). Use the full side-by-side spec tables below to weigh the details against your own operation, and confirm with a dealer demo.
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Fit & specs
John Deere
94
Fit score
Best match
Clear
John Deere
94
Fit score
Best match
Clear
Rated power
165 hp
165 hp
Confidence
98%
98%
Guide price
—
—
Overview
Manufacturer
John DeereReference
John DeereReference
liquid-cooledReference
liquid-cooledReference
Final drives
inboard planetaryReference
—
Drive
—
crawlerReference
Engine
Fuel tank
253.6 LReference
—
Engine (gross)
123.0 kWReference
123.0 kWReference
Engine (net)
115.6 kWReference
108.1 kWReference
Displacement
7.6 LReference
10.1 LReference
Bore/Stroke
116 x 121 mmReference
130 x 127 mmReference
Power (net)
115.6 kWReference
108.1 kWReference
Power (gross)
123.0 kWReference
123.0 kWReference
Air cleaner
dryReference
dryReference
Rated RPM
2200Reference
—
Torque
650.9 NmReference
745.8 NmReference
Torque RPM
1400Reference
1200Reference
Starter
electricReference
electricReference
Starter volts
12Reference
24Reference
Oil capacity
18.9 LReference
32.2 LReference
Coolant capacity
27.4 LReference
34.1 LReference
Compression
—
15.2:1Reference
Transmission
Gears
4 forward and 2 reverseReference
infinite forward and reverseReference
PTO & Hydraulics
Type
power shiftReference
hydrostaticReference
Pressure
181.0 barReference
155.1 barReference
Pump flow
238.5 lpmReference
143.8 lpmReference
Hydraulic system
—
132.5 LReference
Capacity
—
132.5 LReference
Dimensions
Wheelbase
292 cmReference
—
Weight
13299 kgReference
14787 kgReference
Front tire
20.5-25Reference
—
Rear tire
20.5-25Reference
—
Industrial front
23.5-25Reference
—
Industrial rear
23.5-25Reference
—
Length
702 cmReference
386 cmReference
Height (ROPS)
320 cmReference
320 cmReference
Height (exhaust)
312 cmReference
—
Operating weight
13299 kgReference
14787 kgReference
Front tread
203 cmReference
—
Rear tread
203 cmReference
—
6545 dozer length
—
529 cmReference
6540 dozer length
—
533 cmReference
John Deere 644D attachments
Electrical
Charging system
alternatorReference
alternatorReference
ROPS Charging amps
42Reference
—
Cab Charging amps
90Reference
—
Batteries
2Reference
2Reference
Battery CCA
625Reference
570Reference
Battery volts
12Reference
12Reference
Capacities
Fuel
—
310.4 LReference
John Deere 850 attachments
850 Serial Numbers
1977
—
272701Reference
1978
—
283245Reference
1979
—
313290Reference
1980
—
331952Reference
1981
—
363135Reference
1982
—
379892Reference
1983
—
384961Reference
1984
—
701260Reference
John Deere 850 Tracks
Width
—
238 cmReference
Length on ground
—
241 cmReference
Area on ground
—
2.5 m²Reference
Ground pressure
—
0.7 barReference
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.