Allis Chalmers 7580

Last Updated: July 2024

Overview

The Allis Chalmers 7580 is a robust 4WD tractor designed for heavy-duty agricultural tasks. Manufactured from 1977 to 1981 in West Allis, Wisconsin, it offers a durable build and dependable performance. The tractor is powered by an Allis Chalmers 3750 Mark II six-cylinder turbocharged and intercooled diesel engine, providing 186.35 horsepower at 2,550 RPM. With its partial power shift transmission, operators can choose from 20 forward and 4 reverse gears, allowing for a versatile range of speeds and efficient field operations. The 7580's hydrostatic power steering and hydraulic wet disc brakes ensure precise control and safe stopping power. It also boasts a spacious Acousta cab for operator comfort and a significant fuel tank capacity of 170 US gallons for extended work periods without refueling. The tractor's operating weight with ballast is 25,000 lb, and it features 23.1-30 8-ply tires with 16 psi pressure.
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Key Specifications

Category: Utility, Four-Wheel Drive

Power Output: 186.35

Transmission: Partial power shift

Drive Type: 4WD

Operating Weight: 25,000

Fuel Type: Diesel

Allis Chalmers 7580 vs. Similar Tractors

Power Output
Excellent
Greater than 92% of similar tractors.
Operating Weight
Poor
Greater than 6% of similar tractors.

Technical Specifications

Engine

Manufacturer
Allis Chalmers
Model
3750 Mark II
Cooling Type
Liquid-cooled
Cylinder Orientation
Inline
Valve Configuration
-
Fuel Type
Diesel
Induction Type
Turbocharged intercooled
Cylinders
6
Displacement (ci)
426
Bore (in)
4.25
Stroke (in)
5
Rated RPM
2550
Power Output (hp)
186.35

Transmission

Type
Partial power shift
Forward Gears
20
Reverse Gears
4
Total Gears
-

Dimensions

Length (in)
225
Width (in)
95.5
Height (in)
150
Operating Weight (lb)
25,000

Power Take-Off (PTO)

PTO Type
Independent
PTO Speed 1 (rpm)
540
PTO Speed 2 (rpm)
-
PTO Speed 3 (rpm)
-

Miscellaneous

Chassis
4x4 articulated 4WD
Drive Type
4WD
Steering Type
Hydrostatic power
Coolant Capacity (qts)
38
Front Tire Diameter (in)
30
Front Tire Width (in)
23.1
Rear Tire Diameter (in)
30
Rear Tire Width (in)
23.1
Front/Rear Rim Diameter (in)
-
Tire Type
Ag
Manufacture - End Year
1981
Hitch Type
III
Hitch Category
Category 3
Hitch Position
Rear
Hitch Capacity (lb)
-
Operator Station Type
Acousta cab
Starter Type
Electric
Brake Type
Hydraulic wet discs
Hydraulic System Type
Closed center

Test Results

Nebraska Tractor Test Laboratory - Test Date: October 26 to November 8, 1976

Maximum Power and Fuel Consumption

  • Maximum Power: 186.35 HP (138.96 kW) at 2550 rpm
  • Fuel Consumption at Maximum Power: 12.584 Gal/hr (47.636 l/h) with a fuel efficiency of 0.473 lb/hp.hr (0.288 kg/kW.h)

Drawbar Performance

  • Power at Rated Engine Speed (8th Gear): 160.58 HP (119.75 kW) with a drawbar pull of 12946 lbs (57.58 kN) and a speed of 4.65 mph (7.49 km/h)
  • Fuel Consumption at Rated Speed: 0.573 lb/hp.hr (0.349 kg/kW.h) with a fuel efficiency of 12.22 Hp.hr/gal (2.407 kW.h/l)

Torque and Engine Performance

  • Maximum Torque: Not specified directly
  • Torque Rise: Not specified directly

Hydraulic Performance

  • Not specified directly

Overall Efficiency

  • Fuel Efficiency at Standard PTO Speed (996 rpm): 14.81 Hp.hr/gal (2.917 kW.h/l)
  • Fuel Consumption: 12.584 Gal/hr (47.636 l/h) at 2550 rpm



NTTL. (1976). Nebraska Tractor Test 1229 for Allis-Chalmers 7580 Diesel. Lincoln, NE: Nebraska Tractor Test Laboratory. Retrieved from https://digitalcommons.unl.edu/tractormuseumlit/1550

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