Kubota B6100

Kubota B6100The Kubota B6100 is a utility tractor model manufactured from 1978 to 1984 by Kubota in Japan. It was available in two-wheel drive (B6100E) or four-wheel drive (B6100D) versions.

The Kubota B6100 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 gear shift transmission with 6 forward and 2 reverse gears and dry single plate type clutch.

The Kubota B6100 utility tractor features:

  • The D650-A 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 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
  • Rear PTO with 540/750/1,000 rpm
  • 13.0 liters (3.4 US gal.; 2.9 Imp. gal) fuel tank

General specifications

General Specifications
ModelKubota B6100
Tractor typeUtility tractor
Production years1978-1984
Dimensions and weight
Length1,690 mm (66.5 in)
Width 2WD: 920 mm (36.2 in)
4WD: 970 mm (38.2 in)
Height (steering wheel) 2WD: 1,145 mm (45.1 in)
4WD: 1,130 mm (44.5 in)
Wheel base1,240 mm (48.8 in)
Ground clearance240 mm (9.0 in)
Weight 2WD: 439 kg (968 lbs)
4WD: 469 kg (1,034 lbs)
Fuel capacity
Fuel tank capacity13.0 liters (3.4 US gal.; 2.9 Imp. gal)


Engine modelKubota D650-A
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 wet disc brakes
Differential lockMechanical rear
Front axle differential case0.5 liters (0.53 US.qts, 0.44 Imp. qts)
Front axle gear case0.15 liters (0.16 US.qts, 0.13 Imp. qts)
Transmission manufacturer or model
Transmission typeGear shift with dry single plate type clutch
Gears6 forward and 2 reverse
Speed Forward: 13.8 kmh (8.6 mph)
Reverse: 6.95 kmh (4.3 mph)
Transmission oil capacity11.5 L (3 US. gal, 2.5 Imp. gal.)


Front tires Ag: 4.00-9, 6.90-6 (2WD); 6-12 (4WD)
Lawn/turf: 20×8.00-10 (2WD), 20.5×8.00-10 (4WD)
Rear tires Ag: 7.00-16
Lawn/turf: 29×12.00-15 (2WD), 27×8.50-10 (4WD)

Rear Hitch

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

PTO (Power take-off shaft)

Front PTO type
Front PTO speed2,800 rpm
Rear PTO typeTransmission
Rear PTO speed540/750/1,000 rpm

Electrical system

Electrical system
Charging systemAlternator
Charging amps
Battery12V 45Ah

Hydraulic system

Hydraulic system
Hydraulic typeOpen center
Pressure1710 psi (117.9 bar)
Pump flow3.1 gpm (11.7 lpm)


Kubota B222: 48″ front-mount two-stage snow blower
Cleaning width:1,210 mm (48 in)
Cleaning height:580 mm (23 in)
Kubota B1630 Loader
Height (at pin)1,750 mm (69.2 in)
Lift (full at pin)263 kg (580 lbs)
Breakout430 kg (950 lbs)
Dump angle39°
Rollback angle (ground line)20°
Dump reach530 mm (20.9 in)
Ground reach1,190 mm (46.9 in)
Dump clearance1,370 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 angle39°
Dump reach550 mm (22.0 in)
Dump clearance1,410 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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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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