The Allis Chalmers 620 is a 2WD sub-compact utility tractor manufactured by Simplicity for distributor Allis Chalmers from 1973 to 1975. The Allis Chalmers 620 is equipped with a 0.8 L (49.8 cu·in) two-cylinder gasoline engine and a hydrostatic transmission with infinite (3-range) forward and reverse gears.
The Allis Chalmers 620 sub-compact utility tractor used the Onan CCKB engine. It is a 0.8 L, 816 cm2, (49.8 cu·in) two-cylinder natural aspirated gasoline engine with 83.0 mm (3.27 in) of the cylinder bore and 76.0 mm (2.99 in) of the piston stroke. The compression ratio rating is 7.0:1. This engine produced 19.7 PS (14.5 kW; 19.5 HP) at 3,600 rpm of output power.
Allis Chalmers 620 Specifications
| General Specifications | |
| Model | Allis Chalmers 620 |
| Length | 2,100 mm (82.7 in) |
| Width | 1,210 mm (47.6 in) |
| Height | 1,090 mm (42.9 in) |
| Wheel base | – |
| Ground clearance | 380 mm (15 in) |
| Weight | 680 kg (1,499 lbs) |
| Fuel tank capacity | 14.5 liters (3.8 US gal.; 3.2 Imp. gal) |
| Battery | 12V |
| Cabin type | Open operator station |
| Engine | |
| Engine model | Onan CCKB |
| Engine type | Four-stroke, air-cooled, inline |
| Cylinders | 2 |
| Fuel type | Gasoline |
| Displacement | 0.8 L, 816 cm2, (49.8 cu·in) |
| Bore and stroke | 83.0 mm X 76.0 mm (3.27 in X 2.99 in) |
| Compression ratio | 7.0:1 |
| Horsepower | 19.7 PS (14.5 kW; 19.5 HP) at 3,600 rpm |
| Starter | Electric |
| Oil capacity: | 3.3 L (3.5 US. qt, 2.9 Imp. qt.) |
| Transmission and chassis | |
| Chassis | 4×2 2WD |
| Steering type | – |
| Brakes | – |
| Transmission model | |
| Transmission type | Hydrostatic |
| Gears | Infinite (3-range) forward and reverse |
| Tires | |
| Front tires | Ag: 4.00×12 Lawn/turf: 20-8×10 |
| Rear tires | Ag: 8×16 Lawn/turf: 29-12.5×15 |
| Three-Point Hitch | |
| Caterogy | 0 |
| Control type | – |
| Lift capacity (at ends) | – |
| PTO (Power take-off shaft) | |
| Front PTO type | – |
| Front PTO speed | 2,000 rpm |
| Rear PTO type | – |
| Rear PTO speed | 2,000 rpm |
| Hydraulic system | |
| Hydraulic type | – |
| Hydraulic capacity | 4.7 L (4.97 US. qt, 4.14 Imp. qt.) |
| Pressure | 500 psi (34.5 bar) |
| Pump flow | 2.25 gpm (8.5 lpm) |
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