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
ModelGravely 812
Tractor typeGarden tractor
Production years1973-1978
Dimensions and weight
Length1,910 mm (75.2 in)
Width920 mm (36.2 in)
Height1,090 mm (42.9 in)
Wheel base
Weight (shipping)408 kg (899 lbs)
Fuel capacity
Fuel tank capacity20.1 liters (5.3 US gal.; 4.4 Imp. gal)


Engine Specifications
Engine modelKohler K301
Engine type4-stroke, L-head (side valve), single-cylinder
Displacement476 cm3, (29.0 cu·in)
Bore and stroke85.7 mm X 82.6 mm (3.37 in X 3.25 in)
Compression ratio6.0:1
Max. horsepower12.2 PS (9.0 kW; 12.0 HP) at 3,600 rpm
Cooling systemForced air
Lubricating systemSplash type
Fuel systemCarburetor
Starting systemElectirc 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
Oil capacity:1.88 L (1.99 US.qts, 1.65 Imp. qts)
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
Chassis4×2 2WD
Steering typeManual
Transmission manufacturer or model
Transmission typeShaft-driven gear
Gears8 forward and 4 reverse
Speed Forward: 13.5 kmh (8.4 mph)
Reverse: 6.0 kmh (3.7 mph)
Transmission oil capacity5.7 L (1.5 US. gal, 1.3 Imp. gal.)


Front tiresLawn/turf: 16×6.50-8
Rear tiresLawn/turf: 23×8.50-12

Electrical system

Electrical system
Charging system
Charging amps
Battery12V, 43Ah, Group 22F


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Cutting width1,010 mm (40 in)
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Cutting width1,270 mm (50 in)
Weight118 kg (262 lbs)
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Weight113 kg (250 lbs)
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Width1,110 mm (44 in)
Weight117 kg (260 lbs)
Author: Sergei Wers
About: Co-founder and CEO of a multi-brand auto repair shop (engine repair, chassis repair, body repair and painting) for over 15 years. I have been developing internet sites with technical specifications for more than seven years.

ATTENTION! Dear visitors, this is an informational database of technical specifications, we are not a parts supplier or a marketplace.

We try to use official documentation and verify the published data, but errors may occur. In addition, specifications of machinery and equipment may vary depending on markets and modifications. We do not recommend the use of this data for spare parts or repairs. Use official service manuals or parts catalogs for your product.

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