John Deere 120

John Deere 120The 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
ModelJohn Deere 120
Tractor typeLawn tractor
Production years1970-1970
FactoryHoricon, Wisconsin, USA
Dimensions and weight
Length1,715 mm (67.5 in)
Width965 mm (38 in)
Height1,090 mm (42.9 in)
Wheel base1,170 mm (46.1 in)
Weight294 kg (648 lbs)
Fuel capacity
Fuel tank capacity6.6 liters (1.7 US gal.; 1.5 Imp. gal)


Engine Specifications
Engine modelKohler K301AQS
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:1.4 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
Chassis4×2 2WD
Steering typeManual
Transmission manufacturer or modelSundstrand 15
Transmission typeHydrostatic
GearsInfinite forward and reverse


Front tiresLawn/turf: 16×6.00-6
Rear tiresLawn/turf: 23×8.50-12

PTO (Power take-off shaft)

Front PTO typeIndependent with electric clutch
Front PTO speed
Middle PTO typeIndependent with electric clutch
Middle PTO speed

Electrical system

Electrical system
Charging system
Charging amps

Serial numbers

John Deere 120 serial numbers


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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.

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