Kubota B21

Kubota B21The Kubota B21 is a backhoe loader tractor model from the B series, manufactured from 2001 to 2007 by Kubota. It was available in four-wheel drive (4WD) version.

The Kubota B21 is equipped with a 1.0 L (61.1 cu·in) three-cylinder diesel engine with 76.0 mm (2.99 in) of the cylinder bore and 73.6 mm (2.9 in) of the piston stroke, and a hydrostatic transmission with infinite (3-range) forward and reverse gears.

The Kubota B21 backhoe loader tractor features:

  • The Kubota D1005 diesel engine which produces 21.4 PS (15.7 kW; 21.0 HP) at 2,600 rpm of horsepower
  • Hydrostatic power steering
  • Wet disc type brakes
  • Four-post ROPS/FOPS
  • Category I rear hitch with 460 kg (1,015 lbs) of maximum lift capacity
  • Live rear PTO with 540 rpm

General specifications

General Specifications
ModelKubota B21
Tractor typeBackhoe-loader tractor
Production years2001-2007
Dimensions and weight
Wheel base1,530 mm (60.2 in)
Weight1,810 kg (3,990 lbs)
Fuel capacity
Fuel tank capacity23.0 liters (6.1 US gal.; 5.1 Imp. gal)


Engine Specifications
Engine modelKubota D1005
Engine type4-stroke, SOHC, three-cylinders
Displacement1.0 L, 1,001 cm2, (61.1 cu·in)
Bore and stroke76.0 mm x 73.6 mm (3.0 in x 2.9 in)
Max. horsepower21.4 PS (15.7 kW; 21.0 HP) at 2,600 rpm
Cooling systemLiquid-cooled
Coolant capacity:3.4 L (3.6 US. qt, 3 Imp. qt.)
Fuel usedDiesel fuel
Starting systemElectric starting with 12V starter
Starting support deviceGlow plug in combustion chamber
GovernorAll speed mechanical governor
Charging systemAlternator 12V
PTO shaft rotationCounterclockwise
Valve clearance
Intake valve clearance:0.145-0.185 mm (0.0057-0.0073 in)
Exhaust valve clearance:0.145-0.185 mm (0.0057-0.0073 in)
Oil system
Lubrication system:Forced lubrication by trochoid pump
Oil type:CF or higher
Recommended oil:SAE 10W-30, 10W-40
Oil capacity:3.0 L (3.2 US. qt, 2.6 Imp. qt.)
Oil pressure: At idle speed: 49 MPa (0.5 kgf/cm2, 7 psi)
At rated speed: 196 to 441 MPa (2.0-4.5 kgf/cm2, 28 to 64 psi)
Oil filter:Full flow paper filter (Cartridge type)
Oil pressure indicating:Electrical type switch
Oil and oil filter change interval:Every 200 hours
Fuel system
Fuel injection pump:Bosch MD type mini fuel injection pump
Injection nozzle:Mini Nozzle (DNOPD)
Firing order:1-2-3
Injection pressure:13.73 MPa (140 kgf/cm2, 1,991 psi)

Transmission and chassis

Chassis, steering and brakes
Chassis4×4 MFWD 4WD
Steering typeHydrostatic power
BrakesWet disc type
Final driveMechanical rear
Transmission manufacturer or model
Transmission typeHydrostatic
GearsInfinite (3-range) forward and reverse
Speed Forward: 17.9 kmh (11.1 mph)
Reverse: 17.9 kmh (11.1 mph)
Transmission oil capacity27.6 L (7.3 US. gal, 6.1 Imp. gal.)


Front tires Industrial: 23×8.50-14
Rear tiresIndustrial: 12.4-16

Rear Hitch

Three-Point Hitch
Control typePosition control
Lift capacity (at 610 mm/ 24 in)460 kg (1,014 lbs)

PTO (Power take-off shaft)

Rear PTO typeLive
Rear PTO speed540 rpm

Electrical system

Electrical system
Charging system
Charging amps

Hydraulic system

Hydraulic system
Hydraulic typeOpen center
Hydraulic capacity27.6 L (7.3 US. gal, 6.1 Imp. gal.)
Pump flow7.1 gpm (26.9 lpm)
Steering flow1.3 gpm (4.9 lpm)
Total flow8.4 gpm (31.8 lpm)


Kubota loader
Height (to pin):2,550 mm (88.8 in)
Dump angle:45°
Rollback angle:40°
Breakout force (lift):700 kg (1543 lbs)
Lift to full height (at pin):420 kg (926 lbs)
Raise time to height3 s
Bucket width1,420 mm (56 in)
Kubota backhoe
Bucket width400 mm (16 in)
2-Foot flat digging depth2,320 mm (91.7 in)
Reach from pivot3,080 mm (121.3 in)
Bucket force1,410 kg (3,110 lbs)
Dipperstick force792 kg (1,748 lbs)
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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