Kubota B6100HST utility tractor specs and service data

The 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
Model	Kubota B6100HST
Tractor type	Utility tractor
Production years	1977-1997
Factory	Japan
Dimensions and weight
Length	2,120 mm (83.5 in)
Width	980 mm (38.6 in)
Height	1,190 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 capacity	12.9 liters (3.4 US gal.; 2.8 Imp. gal)

Engine

Engine
Engine model	Kubota D650-AH
Engine type	4-stroke, vertical, three-cylinders
Displacement	675 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 system	Liquid-cooled
Lubricating system	Forced lubrication by pump
Combustion chamber	Spherical type
Fuel injection pump	Bosch K Type Mini Pump
Injection type	Indirect injection
Injection nozzle	Bosch throttle type
Firing order	1-2-3
Fuel used	Diesel fuel No.2-D
Starting system	Electric starter (12V)
Starting support device	Glow plug in combustion chamber
Governor	Centrifugal ball mechanical governor
PTO shaft rotation	Counterclockwise (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 pump	Bosch K Type Mini Pump
Injection nozzle	Bosch throttle Type
Injection timing:	25° B.T.D.C.
Fuel injection pressure	13.73-14.71 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
Chassis	4×2 2WD or 4×4 MFWD 4WD
Steering type	Ball screw type
Brakes	Mechanical internal expanding
Transmission
Transmission manufacturer or model	–
Transmission type	Hydrostatic transmission (HST)
Gears	2 forward and 2 reverse
Speed	Forward: 14.5 kmh (9 mph) Reverse: 10.0 kmh (6.2 mph)
Transmission oil capacity	13.4 L (3.5 US. gal, 2.9 Imp. gal.)

Tires

Tires
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
Category	I
Control type	–
Lift capacity (at ends)	180 kg (397 lbs)

PTO (Power take-off shaft)

PTO
Middle PTO type	–
Middle PTO speed	2450 rpm
Rear PTO type	–
Rear PTO speed	540/850 rpm

Electrical system

Electrical system
Ground	Negative
Charging system	Alternator
Charging amps	–
Battery	12V 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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Kubota B6100HST