Allis Chalmers 8550

Production: 1978 - 1981  

Production
Manufacturer:	Allis Chalmers
Type:	Four-wheel Drive (4WD) tractor
Original price:	$86,753

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.
Transmission:	20-speed partial power shift

Hydraulics
Type:	closed center
Valves:	3 or 4
Pump flow:	74.9 gpm 283.5 lpm

Tractor hitch
Rear Type:	IV/III

Power Take-off (PTO)
Rear PTO:	independent
Rear RPM:	1000

8550 Serial Numbers
Location:	Front frame, rear left side
1978:	1083
1979:	1342
1980:	1553
1981:	1723

Electrical
Ground:	negative
Charging system:	alternator
Batteries:	4
Battery volts:	12

Engine Detail
Allis Chalmers 6120T
turbocharged diesel
6-cylinder 24-valve
liquid-cooled inline
Displacement:	731 ci 12.0 L
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)

Transmission
Transmission:	Power Director
Type:	partial power shift
Gears:	20 forward and 4 reverse

Dimensions
Wheelbase:	126 inches 320 cm
Length:	285 inches 723 cm
Width:	95.5 inches 242 cm
119.5 inches 303 cm (long axle)
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