Kubota B7100HST

Kubota B7100HST (1977-1984) compact utility tractor specifications and reviews

Kubota B7100 HSTThe Kubota B7100HST is a compact utility tractor, manufactured by Kubota since 1977 to 1984. The B7100HST tractor is equipped with Kubota D750-AH diesel engine with 0.8 L (750 cc, 46.5 cu-in) of displacement and hydrostatic transmission with infinite 2-range forward and 2-range reverse gears.

The Kubota B7100 HST utility tractor used a three-cylinder liquid-cooled diesel engine Kubota D750-AH with 762 cc (46.5 cu-in) of displacement. This motor has 68.0 mm (2.68 in) of the cylinder bore and 70.0 mm (2.76 in) of the piston stroke. Compression ratio rating is 22.0:1. The engine produced 16.2 PS (11.9 KW; 16.0 HP) at 2,800 rpm of horsepower and 43.1 Nm (4.4 kg·m; 31.81 lbf·ft) at 1,800 rpm of torque.

The Kubota B7100 HST is equipped with a hydrostatic transmission. This transmission has 2-range forward (5.6-14.5 km/h, 3.5-9.0 mph) and 2-range reverse gears (3.9-10.0 km/h, 2.4-6.2 mph).

The Kubota B7100 hydro is avalible in two versions:

  • Kubota B7100HST-E – two-wheel variant 4×2 2WD
  • Kubota B7100HST-D – four-wheel variant 4×4 MFWD 4WD

The tractor used manual steering, brakes with a differential mechanical expanding shoe, open center hydraulic system and foot pedal operated the differential lock. The B7100 HST has an open operator station.

General specifications

General Specifications
ModelKubota B7100 HST
Tractor typeСompact utility tractor
Production years1977-1984
Dimensions and weight
Length2,120 mm (83.8 in.)
Width1,010 mm (40.1 in.)
Height (steering wheel) 2WD: 1,170 mm (46.1 in.)
4WD: 1,180 mm (46.7 in.)
Wheelbase 2WD: 1,380 mm (54.7 in.)
4WD: 1,390 mm (55.1 in.)
Ground clearance 2WD: 250 mm (10.2 in.)
4WD: 240 mm (9.5 in.)
Front tread 2WD: 690 mm (27.4 in.)
4WD: 850 mm (33.5 in.)
Weight 2WD: 522 kg (1,151 lb.)
4WD: 573 kg (1,265 lb.)
Fluid capacity
Fuel tank capacity12.9 liters (3.4 US gal, 2.8 Imp. gal)
Oil capacity3.9 liters (4.1 US.qts, 3.4 Imp. qts)
Coolant capacity4.6 liters (4.9 US.qts, 4.0 Imp. qts)
Front axle differential case1.5 liters (1.6 US.qts, 1.3 Imp. qts)
Front axle gear case0.5 liters (0.5 US.qts, 0.45 Imp. qts)
Hydraulic luid capacity:13.6 liters (3.6 US gal, 3 Imp. gal)
Electrical system
Battery12V 45Ah
Cabin type
Cabin type Standard: Open operator station
Optional: Two-post fixed ROPS (Rollover protection structure)


Engine modelKubota D750-AH
Engine type4-stroke, vertical, three-cylinders
Displacement742 cm3, (45.3 cu·in)
Cylinder bore:68.0 mm (2.68 in)
Piston stroke:70.0 mm (2.76 in)
Compression ratio:22.0:1
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. torque43.1 Nm (4.4 kg·m; 31.81 lbf·ft) at 1,800 rpm
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, 0.8 kW)
Starting support deviceGlow plug in combustion chamber
GovernorCentrifugal ball mechanical governor
PTO shaft rotationCounterclockwise (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 (4.1 US.qts, 3.4 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 capacity4.6 liters (4.9 US.qts, 4.0 Imp. qts)

Transmission and chassis

Transmission and chassis
Chassis B7100HST-E: 4×2 2WD
B7100HST-D: 4×4 MFWD 4WD
SteeringManual type
Differential lockMechanical rear
BrakesDifferential mechanical expanding shoe
Transmission typeHydrostatic
Gears2 forward and 2 reverse
Ground speed Forward: 5.6-14.5 km/h, (3.5-9.0 mph)
Reverse: 3.9-10.0 km/h, (2.4-6.2 mph)


Tires size
Front tires Standard: 6.9-9 (2WD), 6-12 (4WD)
Lawn and turf: 20.5×8.0-10
Rear tires Standard: 8.3-16
Lawn and turf: 29×12.0-15

PTO and 3-point linkage

PTO (Power take-off shaft)
PTO Type:Rear, transmission
PTO Speed: Rear: 540 / 750 / 1,000 rpm
Rear: 2,500 rpm
Front: 2,800 rpm
Hydraulic lift
3-point linkage:Category I
Control system:
No. of remote valves:
Max lifting capacity (at link end):181 kg (400 lb)

Hydraulic system

Hydraulic system
Type:Closed center
Hydraulic luid capacity:13.6 L (3.6 gal.)
Hydraulic flow:11.4 lpm (3.0 gpm)


Kubota RC60-71: 60″ mid-mount mower deck with 3-blade and hydraulic lift
Cutting width:1,520 mm (60.0 in)
Kubota B222: 48″ front-mount two-stage snow blower
Cleaning width:1,210 mm (48.0 in)
Cleaning height:580 mm (23.0 in)
Kubota B1630C Loader
Height (at pin)1,710 mm (67.7 in)
Lift (full at pin)231 kg (510 lbs)
Breakout353 kg (780 lbs)
Dump angle46°
Rollback angle (ground line)28°
Dump reach510 mm (20.25 in)
Ground reach1,220 mm (48.3 in)
Dump clearance1,300 mm (51.5 in)
Bucket width1,210 mm (48 in)

Serial numbers

Serial numbers (Location on clutch housing, left side)

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