Gravely 812 garden tractor specs and service data

The 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
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
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)

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.

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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.

Gravely 812