Bolens HT20

Bolens HT20The Bolens HT20 is a garden tractor model from the Large Frame series, manufactured from 1973 to 1978 by Bolens in Port Washington, Wisconsin, USA. It was available in two-wheel drive (2WD) version.

The Bolens HT-20 is equipped with a 880 cc (53.7 cu·in) two-cylinder gasoline engine with 85.7 mm (3.37 in) of the cylinder bore and 76.2 mm (3.00 in) of the piston stroke, and a shaft-driven hydrostatic transmission with infinite forward and reverse gears.

The Bolens HT20 garden tractor features:

  • The Kohler K532 gasoline engine which produces 19.7 PS (14.5 kW; 19.5 HP) at 3,450 rpm of horsepower
  • Manual steering
  • Disc brakes
  • Open operator station
  • Sleeve hitch (optional)
  • Front PTO with mechanical clutch and 2000 rpm

General specifications

General Specifications
ModelBolens HT20
Tractor typegarden tractor
Production years1973-1978
FactoryPort Washington, Wisconsin, USA
Dimensions and weight
Length1,900 mm (74.8 in)
Width Max: 1,190 mm (46.9 in)
Min: 960 mm (37.8 in)
Height1,140 mm (44.9 in)
Wheel base1,320 mm (52 in)
Ground clearance210 mm (8.3 in)
Weight494 kg (1,089 lbs)
Fuel capacity
Fuel tank capacity18.9 liters (5.0 US gal.; 4.2 Imp. gal)


Engine Specifications
Engine modelKohler K532
Engine type4-stroke, L-head (side valve), single-cylinder
Displacement880 cm3, (53.7 cu·in)
Bore and stroke85.7 mm X 76.2 mm (3.37 in X 3.00 in)
Max. horsepower19.7 PS (14.5 kW; 19.5 HP) at 3,450 rpm
Cooling systemForced air
Lubricating systemSplash type
Fuel systemCarburetor
Starting systemElectirc starter
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:3.8 L (4 US. qt, 3.3 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 typeShaft-driven hydrostatic
GearsInfinite forward and reverse
Speed Forward: 12.9 kmh (8 mph)
Reverse: 6.4 kmh (4 mph)
Transmission oil capacity9.5 L (2.5 US. gal, 2.1 Imp. gal.)


Front tires Ag: 18-8.50×8
Rear tires Ag: 26-12.00×12

Rear Hitch

Three-Point Hitch
CategorySleeve hitch (optional)
Control type
Lift capacity (at ends)

PTO (Power take-off shaft)

Front PTO typewith mechanical clutch
Front PTO speed2000 rpm

Electrical system

Electrical system
Charging systemAlternator
Charging amps15A
Battery12V, 45Ah


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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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