The Gravely 812 is a 2WD garden tractor from the 800 series. This tractor was manufactured by Gravely from 1973 to 1978. The Gravely 812 is equipped with a 0.5 L (29.0 cu·in) single-cylinder gasoline engine and a shaft-driven gear transmission with 8 forward and 4 reverse gears.
The Gravely 812 garden tractor used the Kohler K301 engine. It is a 0.5 L, 476 cm2, (29.0 cu·in) single-cylinder natural aspirated gasoline engine with 85.7 mm (3.37 in) of the cylinder bore and 82.6 mm (3.25 in) of the piston stroke. This engine produced 12.1 PS (8.9 kW; 12.0 HP) at 3,600 rpm of output power.
The Gravely 812 is equipped with manual steering, an open operator station, and 20.1 liters (5.3 US gal.; 4.4 Imp. gal) fuel tank.
Following attachments are available for the Gravely 812 garden tractor:
- Mid-mount Gravely 21296: 1,010 mm (40 in) mower deck with 3-blade and manual or hydraulic (optional) lift
- Mid-mount Gravely 221297: 1,270 mm (50 in) mower deck with 3-blade and manual or hydraulic (optional) lift
- Front-mount Gravely: 1,210 mm (48 in) blade
- Front-mount Gravely 20981: 960 mm (38 in) snow blower
- Front-mount Gravely 20982: 1,110 mm (44 in) snow blower
Gravely 812 Specifications
| General Specifications | |
| Model | Gravely 812 |
| Length | 1,910 mm (75.2 in) |
| Width | 920 mm (36.2 in) |
| Height | 1,090 mm (42.9 in) |
| Wheel base | – |
| Weight (shipping) | 408 kg (900 lbs) |
| Fuel tank capacity | 20.1 liters (5.3 US gal.; 4.4 Imp. gal) |
| Battery | 12V, 43Ah, Group 22F |
| Cabin type | Open operator station |
| Engine | |
| Engine model | Kohler K301 |
| Engine type | Four-stroke, air-cooled |
| Cylinders | 1 |
| Fuel type | Gasoline |
| Displacement | 0.5 L, 476 cm2, (29.0 cu·in) |
| Bore and stroke | 85.7 mm X 82.6 mm (3.37 in X 3.25 in) |
| Horsepower | 12.1 PS (8.9 kW; 12.0 HP) at 3,600 rpm |
| Starter | Electric |
| Oil type | SF or SG |
| Oil capacity: | 2.4 L (2.5 US. qt, 2.1 Imp. qt.) |
| Spark plug | Champion RH10 |
| Transmission and chassis | |
| Chassis | 4×2 2WD |
| Steering type | Manual |
| Brakes | – |
| Transmission model | – |
| Transmission type | Shaft-driven gear |
| Gears | 8 forward and 4 reverse |
| Speed | Forward: 13.5 kmh (8.4 mph) Reverse: 6.0 kmh (3.7 mph) |
| Transmission oil capacity | 5.7 L (1.5 US. gal, 1.3 Imp. gal.) |
| Tires | |
| Front tires | Lawn/turf: 16×6.50-8 |
| Rear tires | Lawn/turf: 23×8.50-12 |

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