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John Deere 850

The John Deere 850 is a compact utility tractor produced from 1978 to 1989. It is part of the 50 Compact Series and was built by Yanmar in Japan. The tractor features a Yanmar 1.3L 3-cylinder liquid-cooled diesel engine producing 25 hp gross. It has an 8-speed gear transmission and offers two- or four-wheel drive options. The 850 includes features such as manual or optional power steering, differential mechanical expanding shoe brakes, and a two-post ROPS. It has a fuel capacity of 8.5 gallons and a hydraulic system capacity of 4.75 gallons, increased to 5.25 gallons after 1984. The rear PTO is a 540 rpm type with a live two-stage clutch introduced in 1984. Dimensions include a 64-inch wheelbase, 117.7-inch length, and 53.3-inch width, with a weight of 2400 lbs. Attachments available include a 72" mid-mount mower deck, snowblower, blade, front-end loader, and backhoe options. The tractor was originally priced at $7,670 in 1983 and $11,000 in 1989.
John Deere 850compact utility tractorYanmar engine25 hp tractor8-speed transmissiontractor attachmentstractor dimensionsPTOhydraulic system
Power25 hp
Founded1978 - 1989
Model850

Technical Specifications

Detailed specifications and technical data for John Deere 850

Power

PTO (tested):22.27 hp (16.6 kW)
PTO (claimed):22 hp (16.4 kW)
Engine (gross):25 hp (18.6 kW)
Drawbar (tested):17.77 hp (13.3 kW)
Drawbar (claimed):19 hp (14.2 kW)

Tires

Ag rear:9.5-24, 11.2-24
Ag front:5.00-15
Lawn/turf rear:13.6-16
Lawn/turf front:23/8.5-12

Engine

Type:diesel
Model:Yanmar 3T80-J
Cooling:liquid-cooled
Cylinders:3-cylinder
Rated RPM:2600
Air cleaner:paper element
Bore/Stroke:3.15x3.35 inches (80 x 85 mm)
Compression:21.2:1
Displacement:78 ci (1.3 L)
Power (gross):25 hp (18.6 kW)
Starter volts:12
Coolant capacity:6 qts (5.7 L)

Capacity

Fuel:8.5 gal (32.2 L)
Hydraulic system:4.75 gal (18.0 L), 5.25 gal (19.9 L) After 1984

Dimensions

Width:53.3 inches (135 cm)
Length:117.7 inches (298 cm)
Weight:2400 lbs (1088 kg)
Wheelbase:64 inches (162 cm)
Rear tread:42 to 50 inches (106 to 127 cm)
Front tread:42 to 58 inches (106 to 147 cm)
Max Drawbar:825 lbs (374 kg)
Height (hood):50.8 inches (129 cm)
Ground clearance:13.7 inches (34 cm)

Electrical

Ground:negative
Battery CCA:570
Battery Group:BCI 30H
Battery volts:12
Charging amps:25
Charging system:alternator

Hydraulics

Type:open center
Capacity:4.75 gal (18.0 L), 5.25 gal (19.9 L) After 1984
Pressure:2030 psi (140.0 bar)

Mechanical

ROPS:Two-post ROPS
Drive:Two- or four-wheel drive
Brakes:Differential mechanical expanding shoe brakes
Steering:manual, power Optional

Production

Type:Compact Utility tractor
Built in:Japan
Distributor:John Deere
Manufacturer:Yanmar
Original price:$7,670 (1983), $11,000 (1989)

Attachments

Backhoes

John Deere 8A Backhoe:John Deere 8A Backhoe
John Deere 1550 Backhoe:{"Weight":"1300 lbs (589 kg)","Swing Arc":"180°","Bucket force":"3107 lbs (1409 kg)","Digging depth":"93 inches (236 cm)","Loading height":"65.5 inches (166 cm)","Bucket Rotation":"180°","Reach from pivot":"131 inches (332 cm)","Transport height":"68 inches (172 cm)","Dipperstick force":"1470 lbs (666 kg)"}
Overview:72" mid-mount mower deck, Snowblower, Blade, Front-end loader, Backhoe

72" Blade

Lift:14.5 inches (36 cm)
Model:John Deere 423
Mount:front-mount
Width:72 inches (182 cm)
Height:24 inches (60 cm)
Weight:405 lbs (183 kg)
Angling:27°
Lift type:hydraulic-lift
Angle control:manual-angle hydraulic -angle Optional

75 Loader

Weight:833 lbs (377 kg)
Dump angle:40°
Dump reach:24 inches (60 cm)
Bucket width:53 inches (134 cm), 61 inches (154 cm)
Ground reach:55 inches (139 cm)
Boom cylinder:2 inches (5 cm)
Height at pin:92 inches (233 cm)
Lift capacity:950 lbs (430 kg) full at pin
Breakout force:1710 lbs (775 kg) at pin
Dump clearance:75 inches (190 cm)
Rollback angle:19° ground line

72" Mower deck

Type:mid-mount John Deere 72
Blades:3-blade
Weight:525 lbs (238 kg)
Cutting width:72 inches (182 cm)
Overall width:84 inches (213 cm)

66" Snow blower

Type:two-stage
Model:John Deere 666
Mount:front-mount
Width:66 inches (167 cm)
Weight:612 lbs (277 kg)
Clear height:28 inches (71 cm)

Transmission

Type:8-speed gear

Tractor hitch

Control:position control
Rear Type:I

Serial Numbers

1978:1000
1979:3859
1980:7389
1981:11338
1982:12481
1983:14183
1984:16006
1985:18001
1986:22001
1987:25501
1988:28337
Final:30852

Power Take-off (PTO)

Rear PTO:transmission Early models, through the 1983 model year, live two-stage clutch Introduced in 1984, tractor serial number 16001
Engine RPM:540@2258
Rear PTO Type:540 (1.375)