Gravely 812

Gravely 812The Gravely 812 is a garden tractor model from the 800 series, manufactured from 1973 to 1978 by Gravely. It was available in a two-wheel drive (2WD) version.

The Gravely 812 is equipped with a 476 L (29.0 cu·in) single-cylinder gasoline engine with 85.7 mm (3.37 in) of the cylinder bore and 82.6 mm (3.25 in) of the piston stroke, and shaft-driven gear transmission with 8 forward and 4 reverse gears.

The Gravely 812 garden tractor features:

  • The Kohler K301 gasoline engine which produces 12.1 PS (8.9 kW; 12.0 HP) at 3,600 rpm of horsepower
  • Manual steering
  • Open operator station

General specifications

General Specifications
Model Gravely 812
Tractor type Garden tractor
Production years 1973-1978
Factory
Dimensions and weight
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 (899 lbs)
Fuel capacity
Fuel tank capacity 20.1 liters (5.3 US gal.; 4.4 Imp. gal)

Engine

Engine Specifications
Engine model Kohler K301
Engine type 4-stroke, L-head (side valve), single-cylinder
Displacement 476 cm3, (29.0 cu·in)
Bore and stroke 85.7 mm X 82.6 mm (3.37 in X 3.25 in)
Compression ratio 6.0:1
Max. horsepower 12.2 PS (9.0 kW; 12.0 HP) at 3,600 rpm
Cooling system Forced air
Lubricating system Splash type
Fuel system Carburetor
Starting system Electirc starter
Compression pressure
Normal: 7.7-8.4 kg/cm2 (7.6-8.3 bar, 110-120 psi) / 1,000 rpm
Valve clearance
Intake valve clearance: 0.20-0.25 mm (0.0079-0.0098 in)
Exhaust valve clearance: 0.43-0.48 mm (0.0169-0.0189 in)
Oil system
Lubrication system: Splash type
Oil type: API SF or SG
Recommended oil: Summer: SAE 30W
Winter: SAE 5W-20, 5W-30
Ignition system
Spark plug: Champion RH10
Spark plug gap: 0.65 mm (0.0256 in)
Spark plug torque: 27 N·m (2.8 kg·m, 19.9 ft·lb)

Transmission and chassis

Chassis, steering and brakes
Chassis 4×2 2WD
Steering type Manual
Brakes
Transmission
Transmission manufacturer or 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

Tires
Front tires Lawn/turf: 16×6.50-8
Rear tires Lawn/turf: 23×8.50-12

Electrical system

Electrical system
Ground Negative
Charging system
Charging amps
Battery 12V, 43Ah, Group 22F

Attachments

Gravely 21296: 40″ mid-mount mower deck with 3-blade, manual or hydraulic (optional) lift
Cutting width 1,010 mm (40 in)
Gravely 221297: 50″ mid-mount mower deck with 3-blade, manual or hydraulic (optional) lift
Cutting width 1,270 mm (50 in)
Weight 118 kg (262 lbs)
Gravely 48″ front-mount blade
Width 1,210 mm (48 in)
Gravely 20981: 38″ front-mount snow blower
Cutting width 960 mm (38 in)
Weight 113 kg (250 lbs)
Gravely 20982: 44″ front-mount snow blower
Width 1,110 mm (44 in)
Weight 117 kg (260 lbs)

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