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Tractor · 1978Unverified
John Deere 850
John Deere 850 — 50 Compact Series · 25 hp. Reference specifications; pending source verification.
The John Deere 850 is a tractor model with a rated power of 25 hp, positioning it at the lighter end of its class. It was manufactured from 1978 to 1989. The tractor features a 3-cylinder diesel liquid-cooled engine paired with four-wheel drive and an 8-speed gearbox. Its operating weight is listed at 1088 kg.
Provisional listing — the headline figure is shown; full specifications are auto-generated and pending verification against published sources.
Rated power
25 hp
Max power
13.3 kW
Weight
1088 kg
Catalogue coverage
Variants represented
2
Richest spec table
140 rows
Recorded power
25 hp
Recorded weight
1088 kg
Transmissions
8-speed gear
Production years
1978-1989
Verified variants
0
1 linked source document displayed
Hover a source tag to verify
Overview
DistributorJohn DeereReference
ManufacturerYanmarReference
Compact Utility tractorReference
Built in JapanReference
Original price$7,670 (1983 )Reference
Original price$11,000 (1989 )Reference
Two- or four-wheel driveReference
SteeringmanualReference
SteeringpowerReference
Differential mechanical expanding shoe brakesReference
Two-post ROPS.Reference
Engine
Yanmar 1.3L 3-cyl dieselReference
Engine (gross)18.6 kWReference
Drawbar (claimed)14.2 kWReference
Drawbar (tested)13.3 kWReference
Yanmar 3T80-JReference
dieselReference
3-cylinderReference
liquid-cooledReference
Displacement1.3 LReference
Bore/Stroke80 x 85 mmReference
Power (gross)18.6 kWReference
Air cleanerpaper elementReference
Compression21.2:1Reference
Rated RPM2600Reference
Starter volts12Reference
Coolant capacity5.7 LReference
Power at rated engine speed16.6 kWReference
Max power13.3 kWReference
Fuel TypeDieselReference
No of Cylinders3-cylinderReference
Rated engine speed2,600Reference
Bore and stroke3.15x3.35 inchesReference
Compression ratio21.2:1Reference
Cooling systemliquid-cooled | 6 qtsReference
Transmission
8-speed gearReference
TypegearReference
Gears8 forward and 2 reverseReference
Clutch210mm dry discReference
forward and reverse options8 forward and 2 reverseReference
PTO & Hydraulics
PTO (claimed)16.4 kWReference
PTO (tested)16.6 kWReference
Hydraulic system18.0 LReference
Hydraulic system19.9 LReference
Typeopen centerReference
Capacity18.0 LReference
Capacity19.9 LReference
Pressure140.0 barReference
Rear TypeIReference
Controlposition controlReference
Rear PTOtransmissionReference
Rear PTOlive two-stage clutchReference
Rear PTO Type540 (1.375)Reference
Engine RPM540@2258Reference
Power at rated PTO speed15.4 kWReference
Capacities
Fuel32.2 LReference
Dimensions
Wheelbase162 cmReference
Weight1088 kgReference
Front tire5.00-15Reference
Rear tire9.5-24Reference
Weight238 kgReference
Weight589 kgReference
Ag front5.00-15Reference
Ag rear9.5-24Reference
Ag rear11.2-24Reference
Lawn/turf front23/8.5-12Reference
Lawn/turf rear13.6-16Reference
Length298 cmReference
Width135 cmReference
Height (hood)129 cmReference
Max Drawbar374 kgReference
Ground clearance34 cmReference
Front tread106 to 147 cmReference
Rear tread106 to 127 cmReference
John Deere 850 attachments
72" mid-mount mower deckReference
snowblowerReference
bladeReference
front-end loaderReference
backhoeReference
850 Serial Number Location
Serial number plate on the rear of the John Deere 850, below the PTO shaft.Reference
850 Serial Numbers
19781000Reference
19793859Reference
19807389Reference
198111338Reference
198212481Reference
198314183Reference
198416006Reference
198518001Reference
198622001Reference
198725501Reference
198828337Reference
Final30852Reference
FAQ: How to read a serial number table.Reference
Electrical
GroundnegativeReference
Charging systemalternatorReference
Charging amps25Reference
Battery CCA570Reference
Battery volts12Reference
Battery GroupBCI 30HReference
Total cold cranking amps570Reference
Attachment overview
72" mid-mount mower deckReference
SnowblowerReference
BladeReference
Front-end loaderReference
BackhoeReference
72" Mower deck
Typemid-mount John Deere 72Reference
Type3-bladeReference
Cutting width182 cmReference
Overall width213 cmReference
John Deere 8A Backhoe
Backhoe typeJohn Deere 8A BackhoeReference
John Deere 1550 Backhoe
Backhoe typeJohn Deere 1550 BackhoeReference
Transport height172 cmReference
Digging depth236 cmReference
Reach from pivot332 cmReference
Loading height166 cmReference
Bucket Rotation180°Reference
Swing Arc180°Reference
Bucket force1409 kgReference
Dipperstick force666 kgReference
Test results
Diesel 8-speed 2WDJune 12 - 21, 1978Link: Nebraska Tractor Test 1280 fileReference
PTO performanceReference
Fuel use6.1 l/hourReference
Fuel use5.3 l/hourReference
Drawbar performanceReference
Gear 6 used for power test.Reference
Max pull1224 kgReference
Gear 4 used for pull test.Reference
Speeds
With 11.2-24 rear tires.Reference
General
Make & ModelYanmarReference
Power
Rated Power25 hpReference
PTO
Rear PTO PowerAvailableReference
Hydraulics
Hydraulics Typeopen centerReference
Maximum operating pressure2,030 psiReference
Rear Hitch category (SAE designation)Category IReference
Rear Hitch Sensing Typeposition controlReference
Dimensions & weight
Overall Height129 cmReference
Overall Length299 cmReference
Wheels & tyres
Rear wheel tread range9.5-24, 11.2-24 inchReference
Front Wheel tread range5.00-15Reference
Steering & brakes
Steering typemanual, powerReference
Values normalized to UK metric units. Every figure is traced to at least one source; verified specs are cross-checked against two or more.
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