| Manufacturer | John Deere |
| Price | 114,945(USD) |
| Model | 8770 |
| Equipment Type | Four-wheel Drive 4WD Tractors |
| Factory | Waterloo, Iowa, USA |
NEBRASKA TRACTOR TEST 1671 2
| Description | Diesel PowrSync 4WD October 19 - November 16, 1993 Link: Nebraska Tractor Test 1671 file PTO performance Drawbar performance |
| Power at rated engine speed | 259.31hp / 193.4kW |
| Fuel use | 15.8gal/hour / 59.8l/hour |
| Power at rated PTO speed | 286.31hp / 213.5kW |
| Max power | 242.52hp / 180.8kW |
| Max pull | 33,464lbs / 15179kg |
JOHN DEERE 8770 POWER
| Engine (gross) | 300hp / 223.7kW |
| PTO (claimed) | 256hp / 190.9kW |
| Drawbar (tested) | 242.52hp / 180.8kW |
| PTO (tested) | 259.31hp / 193.4kW |
ENGINE DETAIL
The John Deere 8770 features a robust 6-cylinder turbocharged diesel engine with a displacement of 10.1L, generating a gross power output of 300hp at 2100 RPM, making it suitable for heavy-duty field operations. A compression ratio of 15.75:1 enhances fuel efficiency, but the dual paper air cleaner requires regular maintenance to ensure optimal engine performance. With an oil capacity of 33.8 quarts and coolant capacity of 58 quarts, the engine's lubrication and cooling systems are well designed, though high oil turnover may be necessary in demanding conditions to prevent overheating.
| Description | John Deere turbocharged aftercooled diesel 6-cylinder liquid-cooled |
| Displacement | 619ci / 10.1L |
| Bore/Stroke | 5.12x5.00inches / 130x 127mm |
| Power (gross) | 300hp / 223.7kW |
| Air cleaner | dual paper elements with aspirator |
| Compression | 15.75:1 |
| Rated RPM | 2100 |
| Starter volts | 12 |
| Oil capacity | 33.8qts / 32.0L |
| Coolant capacity | 58qts / 54.9L |
JOHN DEERE 8770 ENGINE
The John Deere 8770 features a robust 10.1L 6-cylinder diesel engine, providing substantial horsepower and torque for demanding agricultural tasks. The strengths of this engine include fuel efficiency and longevity, though its weight may affect maneuverability in certain terrains. Ideal for large-scale farming operations, farmers should be aware of maintenance costs associated with such high-capacity engines.
| Description | John Deere 10.1L 6-cyl diesel |
TRANSMISSIONS OVERVIEW
The John Deere 8770 features a versatile transmission system with a 12-speed partially synchronized option, a 24-speed two-speed power shift, and a 12-speed full power shift, allowing for smooth transitions in varying field conditions. The partially synchronized option offers easier gear selection for operators, while the full power shift is ideal for higher productivity in demanding applications. However, the complexity of this transmission may require more maintenance and operator training to maximize performance and reliability.
| Description | 12-speed partially synchronized 24-speed two-speed power shift 12-speed full power shift |
TRANSMISSION 1
The John Deere 8770's partially synchronized transmission offers 12 forward and 3 reverse gears, making it versatile for various field operations. The PermaClutch hydraulic wet disc system enhances durability and reduces slippage, allowing for smoother shifting during intensive tasks. However, the limited number of synchronized gears (only in the lower range) may require more frequent shifting in high-demand scenarios, which can increase operator fatigue.
| Transmission | Syncro |
| Type | partially synchronized |
| Gears | 12 forward and 3 reverse |
| Clutch | PermaClutch hydraulic wet disc |
| Description | Three synchronized gears (1-3) in four ranges (A-D) |
TRANSMISSION 2
The John Deere 8770 features a PowrSync two-speed power shift transmission, offering 24 forward and 6 reverse gears with seamless gear transitions due to synchronized shifting. The hydraulic wet disc clutch enhances durability and efficiency, optimizing power delivery during demanding tasks. This setup is ideal for applications requiring varying speeds and torque management, such as plowing or heavy hauling, though operators must be familiar with range and gear selection for optimal performance.
| Transmission | PowrSync |
| Type | two-speed power shift |
| Gears | 24 forward and 6 reverse |
| Clutch | hydraulic wet disc |
| Description | Six gears (1-6) in four ranges (A-D). Power shift between gear pairs 1/2, 3/4, and 5/6. Synchronized shifting between other gears and ranges |
TRANSMISSION 3
The John Deere 8770 features a full power shift transmission with 12 forward and 2 reverse gears, providing smooth power delivery and efficient operation. The hydraulic wet disc clutch enhances durability and reduces wear during shifting. A potential advantage is improved productivity in varying field conditions, while the complexity of the power shift system may require specialized maintenance knowledge.
| Transmission | Power Shift |
| Type | full power shift |
| Gears | 12 forward and 2 reverse |
| Clutch | hydraulic wet disc |
MECHANICAL
The John Deere 8770's articulated 4x4 chassis provides enhanced maneuverability and stability on various terrains, making it ideal for heavy-duty agricultural tasks. Its inboard planetary final drives contribute to lower unsprung weight and improved traction, while the hydrostatic power steering enhances operability, especially in tight turns. The diverse transmission options allow for versatility in speed and torque management, accommodating a range of operation scenarios from field preparation to transport.
| Chassis | 4x4 articulated 4WD |
| Final drives | inboard planetary |
| Steering | hydrostatic power |
| Brakes | hydraulic wet discs |
| Cab | Sound-Gard cab standard |
| Transmissions | 12-speed partially synchronized 24-speed two-speed power shift 12-speed full power shift |
CAPACITY
| Fuel | 220gal / 832.7L |
| Hydraulic system | 38gal / 143.8L |
HYDRAULICS
| Type | closed center pressure compensated |
| Capacity | 38gal / 143.8L |
| Pressure | 2530psi / 174.4bar |
| Rear valves | 3 to 5 |
| Pump flow | 44.8gpm / 169.6lpm |
| SCV flow | 33.3gpm / 126.0lpm |
TRACTOR HITCH
| Rear Type | 3 (optional) |
| Control | draft sensing |
| Rear lift | 14,980lbs / 6794kg |
POWER TAKE-OFF (PTO)
| Rear PTO | independent |
| Clutch | hydraulic wet disc |
| Rear RPM | 1000 (1.75) |
JOHN DEERE 8770 TIRES
The John Deere 8770 offers versatility in tire options for both the front and rear, accommodating various sizes like 18.4R-38 and 20.8R-42, which can optimize traction and soil compaction based on the application. The ability to select wider tires (e.g., 710/70R38) enhances stability and load distribution, making it advantageous for heavy-duty agricultural tasks in diverse terrain. A potential challenge is balancing tire size with operator requirements for maneuverability versus ground pressure, especially in softer soils.
| Ag front | 24.5R-32 / 18.4R-38 / 20.8R-38 / 710/70R38 / 18.4R-42 / 20.8R-42 / 18.4R-46 |
| Ag rear | 24.5R-32 / 18.4R-38 / 20.8R-38 / 710/70R38 / 18.4R-42 / 20.8R-42 / 18.4R-46 |
DIMENSIONS
| Wheelbase | 134inches / 340cm |
| Length | 268.9inches / 683cm |
| Weight | 32,960lbs / 14950kg |
| Shiping weight | 31,438lbs / 14260kg |
| Front axle | 3.937 by 120inches / 99by 3048mm |
| Rear axle | 3.937 by 120inches / 99by 3048mm |
DIMENSIONS & TIRES
The John Deere 8770 tractor, with a wheelbase of 134 inches (340 cm), offers enhanced stability and weight distribution for heavy tillage operations. Weighing between 31,438 to 32,960 pounds, its robust structure can manage various implements while minimizing soil compaction. The 24.5R-32 tires, both front and rear, provide excellent traction on diverse terrains but may limit maneuverability in tight spaces.
| Wheelbase | 134inches / 340cm |
| Weight | 31438 to 32960 pounds |
| Front tire | 24.5R-32 |
| Rear tire | 24.5R-32 |
8770 SERIAL NUMBERS
| Location | Left side of tractor hinge. |
| 1993 | 1001 |
| 1994 | 1771 |
| 1995 | 2795 |
| 1996 | 4001 |
ELECTRICAL
| Ground | negative |
| Batteries | 2 |
| Battery CCA | 925 |
| Battery volts | 12 |