Kubota B6100HST

Kubota B6100HSTThe Kubota B6100HST is a utility tractor model manufactured from 1977 to 1997 by Kubota in Japan. It was available in two-wheel drive (B6100HST-D) or four-wheel drive (B6100HST-E) versions.

The Kubota B6100HST is equipped with a 675 cc (41.2 cu·in) three-cylinder diesel engine with 64.0 mm (2.52 in) of the cylinder bore and 70.0 mm (2.76 in) of the piston stroke, and a hydrostatic transmission (HST) transmission with 2 forward and 2 reverse gears.

The Kubota B6100HST utility tractor features:

  • The D650-AH diesel engine which produces 14.1 PS (10.4 KW; 14.0 HP) at 2,800 rpm of gross horsepower
  • Ball screw type steering
  • Mechanical internal expanding brakes
  • Open operator station with two-post ROPS
  • Category I rear hitch with 180 kg (397 lbs) of maximum lift capacity
  • Middle PTO with 2450 rpm
  • Rear PTO with 540/850 rpm

General specifications

General Specifications
ModelKubota B6100HST
Tractor typeUtility tractor
Production years1977-1997
Dimensions and weight
Length2,120 mm (83.5 in)
Width980 mm (38.6 in)
Height1,190 mm (46.9 in)
Wheel base 2WD: 1,380 mm (54.3 in)
4WD: 1,390 mm (54.7 in)
Ground clearance 2WD: 240 mm (9.4 in)
4WD: 230 mm (9.1 in)
Weight 2WD: 522 kg (1,151 lbs)
4WD: 573 kg (1,263 lbs)
Fuel capacity
Fuel tank capacity12.9 liters (3.4 US gal.; 2.8 Imp. gal)


Engine modelKubota D650-AH
Engine type4-stroke, vertical, three-cylinders
Displacement675 cm3, (41.2 cu·in)
Compression ratio:22.0:1
Cylinder bore:64.0 mm (2.52 in)
Piston stroke:70.0 mm (2.76 in)
Max. horsepower Gross: 14.1 PS (10.4 KW; 14.0 HP) at 2,800 rpm
At PTO-shaft: 11.2 PS (8.2 KW; 11.0 HP) at 2,800 rpm
Max. torque
Cooling systemLiquid-cooled
Lubricating systemForced lubrication by pump
Combustion chamberSpherical type
Fuel injection pumpBosch K Type Mini Pump
Injection typeIndirect injection
Injection nozzleBosch throttle type
Firing order1-2-3
Fuel usedDiesel fuel No.2-D
Starting systemElectric starter (12V)
Starting support deviceGlow plug in combustion chamber
GovernorCentrifugal ball mechanical governor
PTO shaft rotationCounterclockwise (from PTO shaft side)
Cylinder compression
Cylinder compression pressure:31.5 kgf/cm2 (3.09 MPa, 448 psi)
Compression differential limit between cylinders:10% or less
Valve clearance
Intake valve clearance:0.15-0.20 mm (0.006-0.008 in)
Exhaust valve clearance:0.15-0.20 mm (0.006-0.008 in)
Oil system
Lubrication system:Forced lubrication by pump
Oil type:API CC or better
Oil capacity:3.9 liters (4.12 US.qts, 3.43 Imp. qts)
Oil filter:Full flow paper filter (cartridge type)
Oil pressure: At idle spped: 68 kPa (0.7 kgf/cm2, 10 psi)
At rated speed: 196-441 kPa (2.0-4.5 kgf/cm2, 29-64 psi)
Fuel system
Fuel injection pumpBosch K Type Mini Pump
Injection nozzleBosch throttle Type
Injection timing:25° B.T.D.C.
Fuel injection pressure13.73-14.71 MPa (140-150 kgf/cm2, 1991-2133 psi)
Cooling system
Type:Pressurized radiator, forced circulation with water pump
Thermostat’s valve opening temperature:80.5-83.5°C (176.9-182.3°F)
Temperature at which thermostat completely opens:95°C (203°F)
Coolant capacity:4.6 L (4.86 US. qt, 4.05 Imp. qt.)
Electrical system
Battery:12V, 45AH or equivalent
Starter mica undercut:0.5-0.8 mm (0.0197-0.0315 in)
Starter brush length:16.0 mm (0.6299 in)
Alternator (no-load voltage):AC 20V
Glow plug resistance:1.0-1.2 Ω

Transmission and chassis

Chassis, steering and brakes
Chassis4×2 2WD or 4×4 MFWD 4WD
Steering typeBall screw type
BrakesMechanical internal expanding
Transmission manufacturer or model
Transmission typeHydrostatic transmission (HST)
Gears2 forward and 2 reverse
Speed Forward: 14.5 kmh (9 mph)
Reverse: 10.0 kmh (6.2 mph)
Transmission oil capacity13.4 L (3.5 US. gal, 2.9 Imp. gal.)


Front tires Ag: 4.00-9 (2WD); 5.00-12 (4WD)
Lawn/turf: 20×8.0-10 (2WD); 20.5×8.00-10 (4WD)
Rear tires Ag: 7.00-16, 8.00-16 (2 WD); 7-16 (4WD)
Lawn/turf: 29×12.00-15

Rear Hitch

Three-Point Hitch
Control type
Lift capacity (at ends)180 kg (397 lbs)

PTO (Power take-off shaft)

Middle PTO type
Middle PTO speed2450 rpm
Rear PTO type
Rear PTO speed540/850 rpm

Electrical system

Electrical system
Charging systemAlternator
Charging amps
Battery12V 45Ah
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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