Kubota B7100 utility tractor specs and service data

The Kubota B7100 is an utility tractor model manufactured from 1976 to 1985 by Kubota in Japan. It was available in two-wheel drive (B7100E) or four-wheel drive (B7100D) versions.

The Kubota B7100 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 an unsynchronized gear transmission with 6 forward and 2 reverse gears and dry plate type clutch.

The Kubota B7100 utility tractor features:

The D650-A diesel engine which produces 16.2 PS (11.9 kW; 16.0 HP) at 2,800 rpm of gross 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.
Transmission type rear PTO with 540 rpm
13.0 liters (3.4 US gal.; 2.9 Imp. gal) fuel tank

Kubota B7100 serial numbers (clutch housing, left side):
1976: 10001
1977: 13931
1978: 36646
1979: 54221
1980: 64448
1981: 70678
1982: 74217
1983: 76009
1984: 77309
1985: 78435

General specifications

General Specifications
Model	Kubota B7100
Tractor type	Utility tractor
Production years	1976-1985
Factory	Japan
Dimensions and weight
Length	2,000 mm (78.7 in)
Width	1,010 mm (39.8 in)
Height (steering wheel)	1,150 mm (45.3 in)
Wheelbase	1,250 mm (49.2 in)
Ground clearance	280 mm (11 in)
Weight	489 kg (1,078 lbs)
Fuel capacity
Fuel tank capacity	13.0 liters (3.4 US gal.; 2.9 Imp. gal)

Engine

Engine Specifications
Engine model	D750-A
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	0.7 liters (0.74 US.qts, 0.62 Imp. qts)
Front axle gear case	0.15 liters (0.16 US.qts, 0.13 Imp. qts)
Transmission
Transmission manufacturer or model	–
Transmission type	Unsynchronized gear with dry plate type clutch
Gears	6 forward and 2 reverse
Speed	Forward: 13.4 kmh (8.3 mph) Reverse: 6.7 kmh (4.2 mph)
Transmission oil capacity	11.5 L (3 US. gal, 2.5 Imp. gal.)

Tires

Tires
Front tires	Ag:: 6-12 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
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 B222: 48″ front-mount two-stage snow blower
Cleaning width:	1,210 mm (48 in)
Cleaning height:	580 mm (23 in)
Kubota B748: 48″ front-mount two-stage snow blower
Cleaning width:	1,210 mm (48 in)
Kubota B1630 Loader
Height (at pin)	1,750 mm (69.2 in)
Lift (full at pin)	263 kg (580 lbs)
Breakout	430 kg (950 lbs)
Dump angle	39°
Rollback angle (ground line)	20°
Dump reach	530 mm (20.9 in)
Ground reach	1,190 mm (46.9 in)
Dump clearance	1,370 mm (54.1 in)
Bucket width	1,060 mm (42 in) 1,210 mm (48 in) 1,370 mm (54 in)
Kubota B219 Loader
Height (at pin)	1,860 mm (73.5 in)
Lift (full at pin)	226 kg (500 lbs)
Dump angle	39°
Dump reach	550 mm (22.0 in)
Dump clearance	1,410 mm (55.75 in)
Bucket width	960 mm (38 in) 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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Kubota B7100