Kubota B7100HST utility tractor specs and service data

The Kubota B7100HST is an utility tractor model manufactured from 1977 to 1984 by Kubota in Japan. It was available in two-wheel drive (B7100HST-E) or four-wheel drive (B7100HST-D) versions.

The Kubota B7100HST is equipped with a 742 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 with infinite forward and reverse (2-range) gears.

The Kubota B7100HST utility tractor features:

The D650-AH diesel engine which produces 16.2 PS (11.9 kW; 16.0 HP) at 2,800 rpm of horsepower
Manual steering
Mechanical wet disc brakes brakes
Open operator station with two-post ROPS
Category I rear hitch with 180 kg (397 lbs) of maximum lift capacity
Front PTO with 2,800 rpm
Middle PTO with 2,500 rpm
Transmission rear PTO with 540 rpm

General specifications

General Specifications
Model	Kubota B7100HST
Tractor type	Utility tractor
Production years	1977-1984
Factory	Japan
Dimensions and weight
Length	2,120 mm (83.5 in)
Width	1,010 mm (39.8 in)
Height (steering wheel)	2WD: 1,170 mm (46.1 in) 4WD: 1,180 mm (46.5 in)
Wheel base	2WD: 1,380 mm (54.3 in) 4WD: 1,390 mm (54.7 in)
Ground clearance	2WD: 250 mm (9.8 in) 4WD: 240 mm (9.4 in)
Weight	2WD: 522 kg (1,151 lbs) 4WD: 573 kg (1,263 lbs)
Fuel capacity
Fuel tank capacity	13.0 liters (3.4 US gal.; 2.9 Imp. gal)

Engine

Engine Specifications
Engine model	D750-AH
Engine type	4-stroke, vertical, three-cylinders
Displacement	742 cm³, (45.3 cu·in)
Compression ratio:	22.0:1
Cylinder bore:	68.0 mm (2.68 in)
Piston stroke:	70.0 mm (2.76 in)
Max. horsepower	Gross: 16.2 PS (11.9 KW; 16.0 HP) at 2,800 rpm At PTO-shaft: 13.2 PS (9.7 KW; 13.0 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 pressure
Cylinder compression:	31.5 kgf/cm² (3.09 MPa, 448 psi)
Compression differential limit between cylinders:	10% or less
Valve clearance
Intake valve clearance:	0.150-0.200 mm (0.006-0.008 in)
Exhaust valve clearance:	0.150-0.200 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 liters (4.86 US.qts, 4.05 Imp. qts)

Transmission and chassis

Chassis, steering and brakes
Chassis	4×2 2WD or 4×4 MFWD 4WD
Steering type	Manual
Brakes	Mechanical wet disc brakes
Differential lock	Mechanical rear
Front axle differential case	1.5 liters (1.59 US.qts, 1.32 Imp. qts)
Front axle gear case	0.5 liters (0.53 US.qts, 0.44 Imp. qts)
Transmission
Transmission manufacturer or model	–
Transmission type	Hydrostatic
Gears	Infinite forward and reverse (2-range)
Speed	Forward: 14.5 kmh (9.0 mph) Reverse: 10.0 kmh (6.2 mph)
Transmission oil capacity	13.5 L (3.6 US. gal, 3 Imp. gal.)

Tires

Tires
Front tires	Ag:: 6.9-9 (2WD), 6-12 (4WD) Lawn/turf:: 20.5×8.00-10
Rear tires	Ag:: 8.3-16 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
Front PTO type	–
Front PTO speed	2,800 rpm
Middle PTO type	–
Middle PTO speed	2,500 rpm
Rear PTO type	Transmission
Rear PTO speed	540 rpm

Electrical system

Electrical system
Ground	Negative
Charging system	Alternator
Charging amps	–
Battery	12V 45Ah

Hydraulic system

Hydraulic system
Hydraulic type	Open center
Pressure	1710 psi (117.9 bar)
Pump flow	3.1 gpm (11.7 lpm)

Attachments

Kubota RC60-71: 60″ mid-mount mower deck with 3-blade and hydraulic lift
Cutting width width:	1,520 mm (60 in)
Kubota B1630C Loader
Height (at pin)	1,710 mm (67.7 in)
Lift (full at pin)	231 kg (510 lbs)
Breakout	353 kg (780 lbs)
Dump angle	46°
Rollback angle (ground line)	28°
Dump reach	510 mm (20.25 in)
Ground reach	1,220 mm (48.3 in)
Dump clearance	1,300 mm (51.5 in)
Bucket width	1,210 mm (48 in)

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.

Kubota B7100HST