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| info | |
| 1978 - 1981, Four-wheel Drive (4WD) tractor |
| Production | |
| Manufacturer: | Allis Chalmers |
| Original price (USD): | $86,753 |
| Capacity | |
| Fuel: | 170 gal [643.5 L] |
| 3-Point Hitch | |
| Rear Type: | IV/III |
| Power Take-off (PTO) | |
| Rear PTO: | independent |
| Rear RPM: | 1000 |
| Dimensions & Tires | |
| Wheelbase: | 126 inches [320 cm] |
| Weight: | 26400 to 29360 pounds |
| Front tire: | 18.4x38 |
| Rear tire: | 18.4x38 |
| 8550 Serial Numbers | |
| Location: | Front frame, rear left side |
| Allis Chalmers 8550 Power | |
| Engine: | 300 hp [223.7 kW] |
| Drawbar (claimed): | 210 hp [156.6 kW] |
| PTO (claimed): | 250 hp [186.4 kW] |
| Drawbar (tested): | 217.92 hp [162.5 kW] |
| PTO (tested): | 253.88 hp [189.3 kW] |
| Mechanical | |
| Chassis: | 4x4 articulated 4WD |
| Steering: | hydrostatic power |
| Brakes: | hydraulic wet discs |
| Cab: | Acousta Cab II standard with heat and air-conditioning. Optional radio and 8 track tape deck. |
| Hydraulics | |
| Type: | closed center |
| Valves: | 3 or 4 |
| Pump flow: | 74.9 gpm [283.5 lpm] |
| Electrical | |
| Ground: | negative |
| Charging system: | alternator |
| Battery | |
| Number: | 4 |
| Volts: | 12 |
| info | |
| Bore/Stroke: | 5.25x6.25 inches [133 x 159 mm] |
| Power: | 300 hp [223.7 kW] |
| Air cleaner: | dry |
| Compression: | 16.25:1 |
| Rated RPM: | 2500 |
| Idle RPM: | 775-2800 |
| Firing order: | 1-5-3-6-2-4 |
| Starter volts: | 12 |
| Oil capacity: | 46 qts [43.5 L] (2 filter), 60 qts [56.8 L] (3 filter) |
| Coolant capacity: | 72 qts [68.1 L] |
| Intake valve clearance: | 0.015 inches [0.381 mm] (hot) |
| Exhaust valve clearance: | 0.020 inches [0.508 mm] (hot) |
| Engine Detail | |
| Allis Chalmers 6120T, turbocharged diesel, 6-cylinder 24-valve, liquid-cooled inline, 731 ci [12.0 L] |
| info | |
| Speeds: | Allis 8550 speeds with 18.4x38 tires. |
| Transmission | |
| Transmission: | Power Director |
| Type: | partial power shift |
| Gears: | 20 forward and 4 reverse |
| Dimensions | |
| Weight (shipping): | 26,400 lbs [11975 kg] (duals) |
| Weight (operating): | 27,040 lbs [12265 kg] |
| Weight (ballasted): | 29,360 lbs [13317 kg] |
| Wheelbase: | 126 inches [320 cm] |
| Length: | 285 inches [723 cm] |
| Width: | 95.5 inches [242 cm], 119.5 inches [303 cm] (long axle) |
| Height (hood): | 90.3 inches [229 cm] |
| Height (cab): | 139 inches [353 cm] |
| Height (exhaust): | 154 inches [391 cm] |
| Ground clearance: | 17 inches [43 cm] |
| Front tread: | 62 to 123 inches [157 to 312 cm] |
| Rear tread: | 62 to 123 inches [157 to 312 cm] |
| Allis Chalmers 8550 Tires | |
| Ag front: | 20.8x34, 20.8x38, 23.1x30, 24.5x32, 30.5x32 |
| Ag rear: | 20.8x34, 20.8x38, 23.1x30, 24.5x32, 30.5x32 |