John Deere 850

John Deere 850The John Deere 850 is a 2WD or 4WD compact utility tractor from the 50 Compact series. This tractor was manufactured by the Yanmar for John Deere in from 1978 to 1989. The JD 850 is equipped with a 1.3 L three-cylinder diesel engine and gear type transmission (8 forward and 2 reverse gears) with dry disc clutch.

The JD 850 compact utility tractor used the Yanmar 3T80-J engine. It is a 1.3 L, 1,278 cm2, (80.0 cu·in) three-cylinder natural aspirated diesel engine with 80.0 mm (3.15 in) of the cylinder bore and 85.0 mm (3.35 in) of the piston stroke. This engine produced 25.3 PS (18.6 kW; 25.0 HP) at 2,600 rpm of maximum output power.

The John Deere 850 is equipped with manual or power (optional) steering, differential mechanical expanding shoe brakes, open operator station with two-post ROPS and 32.2 liters (8.5 US gal.; 7.1 Imp. gal) fuel tank.

Following attachments are available for John Deere 850 compact utility tractor:

  • Mid-mount John Deere 172: 72 in (1,820 mm) mower deck
  • Front-mount John Deere 423: 72 in (1,820 mm) blade
  • John Deere 80 loader
  • John Deere 8A backhoe

John Deere 850 Specifications

General Specifications
ModelJohn Deere 850
Length2,980 mm (117.3 in)
Width1,350 mm (53.1 in)
Height1,290 mm (50.8 in)
Wheel base1,620 mm (63.8 in)
Weight1,090 kg (2,400 lbs)
Fuel tank capacity32.2 liters (8.5 US gal.; 7.1 Imp. gal)
Cabin typeOpen operator station with two-post ROPS
Engine modelYanmar 3T80-J
Engine typeFour-stroke, liquid-cooled, inline
Fuel typeDiesel
Displacement1.3 L, 1,278 cm2, (80.0 cu·in)
Bore and stroke80.0 mm X 85.0 mm (3.15 in X 3.35 in)
Compression ratio21.2:1
Horsepower25.3 PS (18.6 kW; 25.0 HP) at 2,600 rpm
Coolant capacity:5.7 L (6.02 US. qt, 5.02 Imp. qt.)
Transmission and chassis
Chassis4×2 2WD or 4×4 MFWD 4WD
Steering typeManual or power (optional)
BrakesDifferential mechanical expanding shoe
Transmission model
Transmission typeGear type with dry disc clutch
Gears8 forward and 2 reverse
Speed Forward: 18.8 kmh (11.7 mph) Reverse: 8.7 (5.4 mph)
Front tires Ag: 5.00-15
Lawn/turf: 23/8.5-12
Rear tires Ag: 9.5-24, 11.2-24
Lawn/turf: 13.6-16
Three-Point Hitch
Control type
Lift capacity
PTO (Power take-off shaft)
Rear PTO typeTransmission or live two-stage clutch
Rear PTO spped540 rpm
Hydraulic system
Hydraulic typeOpen center
Hydraulic capacity 18.0 L (19.02 US. qt, 15.84 Imp. qt.) or
19.5 L (20.61 US. qt, 17.16 Imp. qt.)
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We try to use verified sources and official documentation, however, differences between sources or errors in entering information may occur. In addition, the characteristics may vary depending on the modification and market. We do not provide advice on technical issues related to the any operation or repair. We do not recommend using provided information for repairing or spare parts ordering, use only official service manuals and spare-parts catalogs.


  1. Im not sure you can get that without a data plate or maybe a serial number off the engine block. These were only built from 1978-89.

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