Introduction
Allis-Chalmers 720 Garden Tractor
The Allis-Chalmers 720 is a garden tractor manufactured by Simplicity in Port Washington, Wisconsin, produced between 1975 and 1980. Part of the 620 series lineage, this two-wheel-drive machine was designed for residential property maintenance and light-duty agricultural tasks.
Engine and Power
The tractor is powered by an air-cooled, horizontal-shaft opposed-twin engine with a 816 cc displacement. It produces a gross power output of 19.5 hp at a rated speed of 3600 RPM. The engine features a 7:1 compression ratio and uses a paper element air cleaner to manage intake in varied environments.
Transmission and Drivetrain
Power is delivered through a Sundstrand hydrostatic transmission, which provides infinite forward and reverse speed control across three distinct ranges. This configuration allows for precise maneuverability during operation. The tractor utilizes manual steering and is equipped with disc brakes to ensure controlled stopping power.
Hydraulics and PTO Systems
The hydraulic system operates at a pressure of 500 psi with a pump flow capacity of 2.5 gpm and a total system capacity of 1.5 gallons. The tractor is equipped with both front and rear independent PTO systems. The rear PTO operates at 2000 RPM, while the front PTO operates at 3600 RPM, both engaged via an electric clutch for efficient implement management.
Dimensions and Operator Station
The 720 model features a 56-inch wheelbase and a total length of 83 inches. It has a ground clearance of 15 inches, providing adequate space for traversing uneven terrain. The machine is configured with an open operator station, and its shipping weight is approximately 1300 lbs, contributing to its stability during operation.
Conclusion
The Allis-Chalmers 720 represents a durable, mid-range garden tractor suitable for homeowners and hobbyists. With its hydrostatic drive and dual independent PTO system, it provides the versatility required for mowing and general property maintenance tasks.
Production Information of Allis Chalmers, 720
- Built in Port Washington, Wisconsin, USA
- Garden tractor
| Distributor | Allis Chalmers |
|---|---|
| Manufacturer | Simplicity |
Dimension and Tires Information of Allis Chalmers, 720
| Wheelbase | 56 inches [142 cm] |
|---|---|
| Shipping weight | 1300 lbs [589 kg] |
| Height | 43.25 inches [109 cm] |
| Length | 83 inches [210 cm] |
| Ground clearance | 15 inches [38 cm] |
| Width | 48 inches [121 cm] |
| Ag front | 4.00x12 |
|---|---|
| Lawn/turf front | 6.90/6.00-9 |
| Lawn/turf rear | 29x12.00-15 |
| Ag rear | 8.00-16 |
| Lawn/turf rear | 31x15.50-15 |
| Lawn/turf front | 20x8.00-10 |
Engine Specifications of Allis Chalmers, 720
- Air-cooled horizontal-shaft opposed-twin
- Image courtesy of Mike Meyer
- 2-cylinder
| Starter volts | 12 |
|---|---|
| Displacement | 816 cc [49.8 ci] |
| Air cleaner | Paper element |
| Bore/Stroke | 3.25x3.00 inches [83 x 76 mm] |
| Oil capacity | 3.5 qts [3.3 L] |
| Rated RPM | 3600 |
| Compression | 7:1 |
| Power (gross) | 19.5 hp [14.5 kW] |
Transmission Information of Allis Chalmers, 720
Transmission variants 1
| Manufacturer | Sundstrand |
|---|---|
| Oil capacity | 6 qts [5.7 L] |
| Type | Hydrostatic |
| Gears | Infinite forward and reverse (3-range) |
Mechanical Specs of Allis Chalmers, 720
- Two-wheel drive
- Open operator station.
- Manual steering
- Disc brakes
Power Information of Allis Chalmers, 720
| Rear PTO | Independent |
|---|---|
| Clutch | Electric |
| Front PTO | Independent |
| Clutch | Electric |
| Front PTO Type | 3600 |
| Rear PTO Type | 2000 |
Hydraulics Specifications of Allis Chalmers, 720
| Capacity | 1.5 gal [5.7 L] |
|---|---|
| Pressure | 500 psi [34.5 bar] |
| Pump flow | 2.5 gpm [9.5 lpm] |
Three-Point Hitch of Allis Chalmers, 720
| Rear Type | 0 |
|---|
Electrical System of Allis Chalmers, 720
| Ground | Negative |
|---|---|
| Battery AH | 53 |
| Battery volts | 12 |
| Charging system | Flywheel magneto |
| Charging amps | 20 |
Where it sits
Its power puts it in the 99th percentile of 1970s models in our database (1008 machines).
Frequently asked questions
How much horsepower does the Allis Chalmers 720 have?
The Allis Chalmers 720 delivers 19 HP.
What years was the Allis Chalmers 720 produced?
The Allis Chalmers 720 was produced in 1975-1980.
What engine does the Allis Chalmers 720 have?
The Allis Chalmers 720 is powered by a 2-cylinder engine.
What transmission does the Allis Chalmers 720 use?
The Allis Chalmers 720 uses a Hydrostatic transmission.
How much does the Allis Chalmers 720 weigh?
The Allis Chalmers 720 weighs 1300 lbs [589 kg].
Is the Allis Chalmers 720 4WD?
The Allis Chalmers 720 is available in 2WD.