John Deere 850 Specs
| Production | |
| Distributor | John Deere |
| Manufacturer | Yanmar |
| Compact Utility tractor | |
| Built in Japan | |
| Original price | $7,670 (1983 ) |
| $11,000 (1989 ) | |
| Engine Detail | |
| Yanmar 3T80-J | |
| diesel | |
| 3-cylinder | |
| liquid-cooled | |
| Displacement | 78 ci 1.3 L |
| Bore/Stroke | 3.15×3.35 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 | |
| Type | gear |
| Gears | 8 forward and 2 reverse |
| Clutch | 210mm dry disc |
| 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 |
| Mechanical | |
| Two- or four-wheel drive | |
| Steering | manual |
| power Opt | |
| 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* 19.9 L | |
| Hydraulics | |
| Type | open center |
| Capacity | 4.75 gal 18.0 L |
| 5.25 gal* 19.9 L | |
| Pressure | 2030 psi 140.0 bar |
| Tractor hitch | |
| Rear Type | I |
| Control | position control |
| Power Take-off (PTO) | |
| Rear PTO | transmission * |
| live two-stage clutch * | |
| Rear PTO Type | 540 (1.375) |
| Engine RPM | 540@2258 |
| 850 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 |
| Electrical | |
| Ground | negative |
| Charging system | alternator |
| Charging amps | 25 |
| Battery CCA | 570 |
| Battery volts | 12 |
| Battery Group | BCI 30H |
| 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 |
| 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 |
John Deere 850 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 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 |
John Deere 850 Problems
The John Deere 850 tractor has been reported to experience several issues, primarily related to power loss and engine performance. Here are some common problems noted by users:
- Power Loss and Stalling: Some owners have reported that their John Deere 850 loses power after about an hour of operation, eventually stalling. After a brief cooldown period, the tractor can restart but will again lose power after some time. This issue has been linked to potential problems with the injector pump or fuel system, including contamination in the fuel tank and lines.
- Cooling System Issues: Despite thorough maintenance of the cooling system (which includes flushing, replacing hoses, and installing a new radiator), some users still encounter overheating or related performance issues, which may contribute to the power loss experienced during operation.
- Fuel Contamination: Users have reported finding slimy substances and water in the fuel tank, indicating that fuel contamination can lead to operational problems. Cleaning the fuel tank and replacing fuel filters are recommended steps to mitigate this issue.
- General Maintenance Concerns: Regular maintenance is crucial for the longevity of the tractor. Issues can arise from neglecting oil changes or failing to replace filters at recommended intervals.
These problems highlight the importance of routine maintenance and prompt attention to any signs of performance issues in the John Deere 850 tractor.
John Deere 850 Review
The John Deere 850 is a compact utility tractor known for its reliability and versatility, produced between 1978 and 1989. Here’s a closer look at what makes this tractor noteworthy:
Historical Significance
The John Deere 850 marks an important period in agricultural history, representing the emergence of compact utility tractors. Its partnership with Yanmar, a reputable Japanese manufacturer, ensured robust engineering and solid performance.
Performance and Specifications
- Engine: It’s powered by a Yanmar 1.3L 3-cylinder diesel engine that delivers around 25 horsepower. This engine is strong enough for various farm tasks while being fuel-efficient.
- Versatility: Its compact size makes it easy to maneuver, and it can be fitted with a range of attachments like mowers, loaders, and backhoes, making it highly useful for different farming needs.
- Drive Options: The John Deere 850 comes in both two-wheel and four-wheel drive versions, offering flexibility based on the terrain.
Reliability and Maintenance
The tractor is praised for its durable build and straightforward maintenance. Users find its design user-friendly for regular upkeep. However, some have experienced power loss during extended use, often due to issues with the fuel system or wear on the injector pump.
Collectibility
With its limited production run and historical importance, the John Deere 850 has become a sought-after collector’s item. Collectors appreciate its rarity and its role in a pivotal era of agricultural development.
Conclusion
The John Deere 850 is a dependable and versatile tractor ideal for small to medium-sized farms. Its combination of power, compactness, and adaptability makes it a valuable tool for various agricultural tasks, while its historical significance adds to its appeal among enthusiasts and collectors.