John Deere 120 lawn tractor specs and service data

The John Deere 120 is a lawn tractor model from the 100 Lawn series, manufactured from 1970 to 1970 by John Deere in Horicon, Wisconsin, USA. It was available in a two-wheel drive (2WD) version.

The John Deere 120 is equipped with a 476 cc (29.0 cu·in) single-cylinder gasoline engine with 86.0 mm (3.39 in) of the cylinder bore and 83.0 mm (3.27 in) of the piston stroke, and a hydrostatic transmission with infinite forward and reverse gears.

The John Deere 120 lawn tractor features:

The Kohler K301AS gasoline engine which produces 12.1 PS (8.9 kW; 12.0 HP) at 3,600 rpm of horsepower.
Manual steering
Disc brakes
Open operator station
Sleeve hitch (optioanl)
Independent front PTO with electric clutch
Independent middle PTO with electric clutch

General specifications

General Specifications
Model	John Deere 120
Tractor type	Lawn tractor
Production years	1970-1970
Factory	Horicon, Wisconsin, USA
Dimensions and weight
Length	1,715 mm (67.5 in)
Width	965 mm (38 in)
Height	1,090 mm (42.9 in)
Wheel base	1,170 mm (46.1 in)
Weight	294 kg (648 lbs)
Fuel capacity
Fuel tank capacity	6.6 liters (1.7 US gal.; 1.5 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
Oil capacity:	1.4 L (1.5 US. qt, 1.2 Imp. qt.)
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	Disc
Transmission
Transmission manufacturer or model	Sundstrand 15
Transmission type	Hydrostatic
Gears	Infinite forward and reverse

Tires

Tires
Front tires	Lawn/turf: 16×6.00-6
Rear tires	Lawn/turf: 23×8.50-12

PTO (Power take-off shaft)

PTO
Front PTO type	Independent with electric clutch
Front PTO speed	–
Middle PTO type	Independent with electric clutch
Middle PTO speed	–

Electrical system

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

Serial numbers

John Deere 120 serial numbers
1970	1001
1971	7500

Attachments

John Deere 41: 38″ mid-mount mower deck with 2-blade and hydraulic lift
Cutting width	960 mm (38 in)
John Deere 48″ mid-mount mower deck with 3-blade and hydraulic lift
Cutting width	1,210 mm (48 in)
John Deere 54″ front-mount blade with hydraulic-lift
Cutting width	1,370 mm (54 in)
John Deere 54C: 54″ center-mount blade with hydraulic-lift and manual-angle (hydraulic-angle optional)
Cutting width	1,370 mm (54 in)
Lift	70 mm (3 in)
Angling	20°
Weight	Manual: 47 kg (104 lbs) Hydraulic: 50 kg (112 lbs)
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)

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.

John Deere 120