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Allis Chalmers 7580 vs Allis Chalmers 8550
Verdict: Allis Chalmers 7580 vs Allis Chalmers 8550
The Allis Chalmers 7580 and the Allis Chalmers 8550 are both tractors — here is how they stack up on the figures that matter. Allis Chalmers 8550 leads on rated power with 254 hp against 186 hp. Allis Chalmers 7580 is the lighter machine (23,100 kg vs 26,400 kg), which helps on soft ground and transport, while the heavier model carries more ballast for traction-limited draft work. Allis Chalmers 8550 is the newer design (1978 vs 1976). In short: choose the Allis Chalmers 8550 for outright pulling power, or the Allis Chalmers 7580 if a tighter budget and lighter footprint matter more. Compare the full spec tables below before booking a demo.
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Fit & specs
Allis Chalmers
85
Fit score
Best match
Clear
Allis Chalmers
62
Fit score
Clear
Rated power
186 hp
254 hp
Confidence
40%
40%
Guide price
—
—
Overview
Manufacturer
Allis ChalmersReference
Allis ChalmersReference
With 20.8x38 rear tires.Reference
Allis 8550 speeds with 18.4x38 tires.Reference
Total built
1610Reference
—
Original price
$63,084Reference
$86,753Reference
Steering
hydrostatic powerReference
hydrostatic powerReference
Engine
Fuel tank
643.5 LReference
643.5 LReference
Drawbar (claimed)
114.1 kWReference
156.6 kWReference
Drawbar (tested)
114.6 kWReference
162.5 kWReference
Displacement
7.0 LReference
12.0 LReference
Bore/Stroke
108 x 127 mmReference
133 x 159 mmReference
Air cleaner
dryReference
dryReference
Compression
16:1Reference
16.25:1Reference
Rated RPM
2550Reference
2500Reference
Idle RPM
775-2750Reference
775-2800Reference
Firing order
1-5-3-6-2-4Reference
1-5-3-6-2-4Reference
Starter volts
12Reference
12Reference
Oil capacity
23.7 LReference
56.8 LReference
Coolant capacity
36.0 LReference
68.1 LReference
Power at rated engine speed
139.0 kWReference
189.3 kWReference
Max power
114.6 kWReference
162.5 kWReference
Engine
—
223.7 kWReference
Power
—
223.7 kWReference
Intake valve clearance
—
0.381 mmReference
Exhaust valve clearance
—
0.508 mmReference
Transmission
Transmission
Power DirectorReference
Power DirectorReference
Gears
20 forward and 4 reverseReference
20 forward and 4 reverseReference
PTO & Hydraulics
PTO (claimed)
138.7 kWReference
186.4 kWReference
PTO (tested)
139.0 kWReference
189.3 kWReference
Type
partial power shiftReference
partial power shiftReference
Valves
3 to 4Reference
3 or 4Reference
Pump flow
87.1 lpmReference
283.5 lpmReference
Total flow
283.5 lpmReference
—
Rear Type
IIIReference
IV/IIIReference
Rear PTO
independentReference
independentReference
Rear PTO Type
1000Reference
1000Reference
Dimensions
Wheelbase
320 cmReference
320 cmReference
Weight
23100 to 23510 poundsReference
26400 to 27040 poundsReference
Front tire
20.8x38Reference
18.4x38Reference
Rear tire
20.8x38Reference
18.4x38Reference
Ag front
18.4x38Reference
30.5x32Reference
Ag rear
18.4x38Reference
30.5x32Reference
Length
571 cmReference
723 cmReference
Width
303 cmReference
303 cmReference
Height (hood)
216 cmReference
—
Height (exhaust)
381 cmReference
—
Ground clearance
43 cmReference
43 cmReference
Front tread
157 to 312 cmReference
157 to 312 cmReference
Rear tread
157 to 312 cmReference
157 to 312 cmReference
Shipping
10478 kgReference
11975 kgReference
Operating
10664 kgReference
12265 kgReference
Ballasted
11340 kgReference
13317 kgReference
7580 Serial Numbers
1976
1001Reference
—
1977
1288Reference
—
1978
1605Reference
1083Reference
1979
2218Reference
1342Reference
1980
2486Reference
1553Reference
1981
2717Reference
1723Reference
Location:
Front frame, rear left sideReference
Front frame, rear left sideReference
Final
3018Reference
—
Electrical
Charging system
alternatorReference
alternatorReference
Batteries
4Reference
4Reference
Battery volts
12Reference
12Reference
Ground
—
negativeReference
Test results
Fuel use
47.7 l/hourReference
66.2 l/hourReference
Max pull
10573 kgReference
11893 kgReference
Speeds
8550 Serial Numbers
Allis Chalmers 8550 Height
Hood
—
229 cmReference
Cab
—
353 cmReference
Exhaust
—
391 cmReference
Fit score weighs budget, operation size, crop match and data confidence against the details above. It’s guidance, not advice — always confirm with a dealer demo.