John Deere 312

The John Deere 312 is a garden tractor model from the 300 series, manufactured from 1977 to 1978 by John Deere in Horicon, Wisconsin, USA. It was available in a two-wheel drive (2WD) version.

The John Deere 312 is equipped with a 476 cc (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 a shaft-driven hydrostatic transmission with infinite forward and reverse gears.

The John Deere 312 garden tractor features:

• The Kohler K301AQS gasoline engine which produces 12.1 PS (8.9 kW; 12.0 HP) at 3,500 rpm of horsepower
• Manual steering
• Open operator station
• Sleeve hitch (optional)

General specifications

General Specifications
Model	John Deere 312
Tractor type	Garden tractor
Production years	1977-1978
Factory	Horicon, Wisconsin, USA
Dimensions and weight
Length	–
Width	–
Height	–
Wheel base	–
Weight	344 kg (758 lbs)
Fuel capacity
Fuel tank capacity	17.0 liters (4.5 US gal.; 3.7 Imp. gal)

Engine

Engine Specifications
Engine model	Kohler K301AQS
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	Sundstrand 15
Transmission type	Shaft-driven hydrostatic
Gears	Infinite forward and reverse

Tires

Tires
Front tires	Lawn/turf: –
Rear tires	Lawn/turf: –

Electrical system

Electrical system
Ground	Negative
Charging system	–
Charging amps	–
Battery	12V

Serial numbers

John Deere 312 serial numbers
1977	C312F070001
1978	C312G080001

Attachments

John Deere 38″ mid-mount mower deck
Cutting width	960 mm (38 in)
John Deere 46″ mid-mount mower deck
Cutting width	1,160 mm (46 in)
John Deere 49: 46″ front-mount one-stage snow blower with hydraulic-lift
Cleaning width	1,160 mm (46 in)
Weight	89 kg (197 lb)
John Deere 320 loader
Height (to pin)	1,800 mm (71 in)
Loader weight	143 kg (316 lbs)
Clearance, dumped bucket	1,290 mm (51 in)
Dump reach	300 mm (12 in)
Dump angle	55°
Clearance, level bucket	1,570 mm (62 in)
Reach at ground	220 mm (9 in)
Breakout force (lift)	340 kg (750 lbs)
Lift to full height (at pin)	226 kg (500 lbs)
Bucket width	1,010 mm (40 in) 1,210 mm (48 in) 1,520 mm (60 in)