John Deere 850
The John Deere 850 is a tractor produced by John Deere. It is equipped with a 78 ci 1.3 L engine. The listed engine power is Diesel (gross): 25 hp / 18.6 kW. Transmission: 8 forward and 2 reverse. Operating weight: 1300 lbs 589 kg.
Engine Power
Diesel (gross): 25 hp / 18.6 kW
Fuel & Capacities
8.5 gal
32.2 L
Transmission
8 forward and 2 reverse
Operating Weight
1300 lbs
589 kg
Overview
 | 1978 - 1989
50 Compact SeriesCompact Utility tractorYanmar built
50 Compact Series
Compact Utility tractor
Yanmar built |
|---|
Production | |
|---|---|
Distributor | John Deere |
Manufacturer | Yanmar |
Compact Utility tractor | |
Built in Japan | |
Original price | $7,670 (1983 ) |
$11,000 (1989 ) | |
John Deere 850 Engine | |
|---|---|
Yanmar 1.3L 3-cyl diesel | |
Engine details ...  |
John Deere 850 Transmission | |
|---|---|
8-speed gear | |
Transmission details ...  |
John Deere 850 Power | |
|---|---|
Engine (gross) | 25 hp
18.6 kW |
Drawbar (claimed) | 19 hp
14.2 kW |
PTO (claimed) | 22 hp
16.4 kW |
Drawbar (tested) | 17.77 hp
13.3 kW |
PTO (tested) | 22.27 hp
16.6 kW |
Performance test details ...  | |
Mechanical | |
|---|---|
Two- or four-wheel drive | |
Steering | manual |
power OptOptional | |
Differential mechanical expanding shoe brakes | |
Two-post ROPS. | |
Capacity | |
|---|---|
Fuel | 8.5 gal
32.2 L |
Hydraulic system | 4.75 gal
18.0 L |
5.25 gal*After 1984
19.9 L | |
Hydraulics | |
|---|---|
Type | open center |
Capacity | 4.75 gal
18.0 L |
5.25 gal*After 1984
19.9 L | |
Pressure | 2030 psi
140.0 bar |
Tractor hitch | |
|---|---|
Rear Type | I |
Control | position control |
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. | |
Rear PTO Type | 540 (1.375) |
Engine RPM | 540@2258 |
Dimensions & Tires | |
|---|---|
Wheelbase | 64 inches
162 cm |
Weight | 2400 lbs
1088 kg |
Front tire | 5.00-15 |
Rear tire | 9.5-24 |
Full dimensions and tires ...  | |
Electrical | |
|---|---|
Ground | negative |
Charging system | alternator |
Charging amps | 25 |
Battery CCA | 570 |
Battery volts | 12 |
Battery Group | BCI 30H |
References | |
|---|---|
 | |
Introducing the John Deere lawn and garden line for 1979 | |
Consumer Products Price List published in 1983, by John Deere | |
Grounds Care Equipment Purchasing Guide published in 1983, by John Deere | |
Compact Utility/Utility Tractors Product Information Handbook published in 1983, by John Deere | |
Operator's Manual 850, 950 and 1050 Tractors (OMRW19870) published in 1984 | |
John Deere 850 and 950 tractors published in 1978 | |
Operator's Manual 850 and 950 Tractors (OMR68993) published in 1978 | |
John Deere tractors 22 to 50 HP published in 1980 | |
Compact Utility Diesel Tractors 14.5 to 40 PTO hp published in 1982, by John Deere | |
Diesel Tractors 14.5 to 60 PTO hp published in 1984, by John Deere |
Engine
Engine Detail — 78 ci / 1.3 L Diesel
Manufacturer | Yanmar 3T80-J |
Fuel Type | Diesel |
Configuration | 3-cylinder, liquid-cooled |
Displacement | 78 ci
1.3 L |
Bore/Stroke | 3.15x3.35 inches
80 x 85 mm |
Power (gross) | 25 hp
18.6 kW |
Air cleaner | paper element |
Compression | 21.2:1 |
Rated RPM | 2600 |
Starter volts | 12 |
Coolant capacity | 6 qts
5.7 L |
Transmission
Transmission — 8 forward and 2 reverse gear
Type | gear |
Gears | 8 forward and 2 reverse |
Clutch | 210mm dry disc |
With 11.2-24 rear tires. | |
 | |
Dimensions
John Deere 850 Tires | |
|---|---|
Ag front | 5.00-15 |
Ag rear | 9.5-24 |
11.2-24 | |
Lawn/turf front | 23/8.5-12 |
Lawn/turf rear | 13.6-16 |
Dimensions | |
|---|---|
Wheelbase | 64 inches
162 cm |
Length | 117.7 inches
298 cm |
Width | 53.3 inches
135 cm |
Height (hood) | 50.8 inches
129 cm |
Weight | 2400 lbs
1088 kg |
Max Drawbar | 825 lbs
374 kg |
Ground clearance | 13.7 inches
34 cm |
Front tread | 42 to 58 inches
106 to 147 cm |
Rear tread | 42 to 50 inches
106 to 127 cm |
Tests
Nebraska Tractor Test 1280 | |
|---|---|
Diesel 8-speed 2WD
June 12 - 21, 1978
Link: Nebraska Tractor Test 1280 file | |
PTO performance | |
Power at rated engine speed | 22.27 hp
16.6 kW |
Fuel use | 1.6 gal/hour
6.1 l/hour |
Power at rated PTO speed | 20.66 hp
15.4 kW |
Fuel use | 1.4 gal/hour
5.3 l/hour |
Drawbar performance | |
Max power | 17.77 hp
13.3 kW |
Fuel use | 1.6 gal/hour
6.1 l/hour |
Gear 6 used for power test. | |
Max pull | 2,699 lbs
1224 kg |
Gear 4 used for pull test. | |
Attachments
Attachment overview | |
|---|---|
72" mid-mount mower deck | |
Snowblower | |
Blade | |
Front-end loader | |
Backhoe |
72" Mower deck | |
|---|---|
Type | mid-mount John Deere 72 |
3-blade | |
Cutting width | 72 inches
182 cm |
Weight | 525 lbs
238 kg |
Overall width | 84 inches
213 cm |
John Deere 8A Backhoe | |
|---|---|
Backhoe type | John Deere 8A Backhoe |
John Deere 1550 Backhoe | |
|---|---|
Backhoe type | John Deere 1550 Backhoe |
Weight | 1300 lbs
589 kg |
Transport height | 68 inches
172 cm |
Digging depth | 93 inches
236 cm |
Reach from pivot | 131 inches
332 cm |
Loading height | 65.5 inches
166 cm |
Bucket Rotation | 180° |
Swing Arc | 180° |
Bucket force | 3107 lbs
1409 kg |
Dipperstick force | 1470 lbs
666 kg |
Recommended Implements & Sizing Guide
Engineering recommendations for John Deere 850 based on its 25 HP power envelope and ASAE agricultural standards.
| Implement & Operation | Recommended Size | Workload Rating | Engineering Notes |
|---|---|---|---|
Moldboard PlowPrimary Tillage | 1 to 2 Bottom (12")1 - 2 铧 (30 cm) | Light Duty | Ideal for garden plots and light sandy soil. |
Rotary Cutter / MowerMowing & Clearing | 5 ft (60 in)1.5 m | Medium Duty | Pasture maintenance and weeds up to 1.5" diameter. |
Rotary TillerSeedbed Prep | 54 to 60 in135 - 150 cm | Medium Duty | Thorough seedbed preparation in orchards and vegetable plots. |
Disc HarrowSecondary Tillage | 5 to 6 ft (16-18" discs)1.5 - 1.8 m (40-45 cm 耙片) | Light Duty | Small acreage soil break-up and secondary aeration. |
Sizing & Soil Condition NoteActual implement sizing varies depending on local soil conditions (heavy clay vs sandy loam), field slope, and operating speed. Heavy tillage implements may require front ballast weights and wheel weights.
Fluids, Capacities & Working Autonomy
Standard fluid requirements, service intervals, and continuous runtime estimates for John Deere 850.
Estimated Continuous Field Runtime: 6.5 hrs
Approximately 6.5 hours of continuous field operation at ~75% rated power on a full tank (8.5 gal / 32.2 L).
Estimated 75% Load Fuel Burn~1.3 gal/hr (4.9 L/hr)
Engine Crankcase Oil
SAE 15W-40 (Heavy Duty Diesel)
Standard Spec: API CK-4 / CJ-4 Heavy Duty
Service Interval: 150 – 250 Hours
Transmission & Hydraulic System
UTTO (Universal Tractor Transmission Oil)
Standard Spec: ISO VG 46 / 68 (Wet Brake & Trans Compatible)
Service Interval: 600 – 1000 Hours
Engine Cooling System
50/50 Ethylene Glycol Pre-mix
Standard Spec: ASTM D6210 / Heavy-Duty OAT Antifreeze
Service Interval: 2 Years / 1500 Hours
John Deere 850 Specification Unit Converter
Convert power, fluid capacities, and operating weights between metric and imperial standards for John Deere 850.
Converted Equivalents:
Horsepower (HP)25 hp
Kilowatts (kW)18.6 kW
Metric Horsepower (PS / CV)25.3 PS
Direct Competitor Comparison
Compare John Deere 850 against same-era industry alternatives in the same horsepower class.
Current Model
John Deere
John Deere 850
Engine Power:Diesel (gross): 25 hp / 18.6 kW
★ Baseline Reference
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