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
Model Kubota B21
Tractor type Backhoe-loader tractor
Production years 2001-2007
Dimensions and weight
Wheel base 1,530 mm (60.2 in)
Weight 1,810 kg (3,990 lbs)
Fuel capacity
Fuel tank capacity 23.0 liters (6.1 US gal.; 5.1 Imp. gal)


Engine Specifications
Engine model Kubota D1005
Engine type 4-stroke, SOHC, three-cylinders
Displacement 1.0 L, 1,001 cm2, (61.1 cu·in)
Bore and stroke 76.0 mm x 73.6 mm (3.0 in x 2.9 in)
Max. horsepower 21.4 PS (15.7 kW; 21.0 HP) at 2,600 rpm
Cooling system Liquid-cooled
Coolant capacity: 3.4 L (3.6 US. qt, 3 Imp. qt.)
Fuel used Diesel fuel
Starting system Electric starting with 12V starter
Starting support device Glow plug in combustion chamber
Governor All speed mechanical governor
Charging system Alternator 12V
PTO shaft rotation Counterclockwise
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
Chassis 4×4 MFWD 4WD
Steering type Hydrostatic power
Brakes Wet disc type
Final drive Mechanical rear
Transmission manufacturer or model
Transmission type Hydrostatic
Gears Infinite (3-range) forward and reverse
Speed Forward: 17.9 kmh (11.1 mph)
Reverse: 17.9 kmh (11.1 mph)
Transmission oil capacity 27.6 L (7.3 US. gal, 6.1 Imp. gal.)


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

Rear Hitch

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

PTO (Power take-off shaft)

Rear PTO type Live
Rear PTO speed 540 rpm

Electrical system

Electrical system
Ground Negative
Charging system
Charging amps
Battery 12V

Hydraulic system

Hydraulic system
Hydraulic type Open center
Hydraulic capacity 27.6 L (7.3 US. gal, 6.1 Imp. gal.)
Pump flow 7.1 gpm (26.9 lpm)
Steering flow 1.3 gpm (4.9 lpm)
Total flow 8.4 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 height 3 s
Bucket width 1,420 mm (56 in)
Kubota backhoe
Bucket width 400 mm (16 in)
2-Foot flat digging depth 2,320 mm (91.7 in)
Reach from pivot 3,080 mm (121.3 in)
Bucket force 1,410 kg (3,110 lbs)
Dipperstick force 792 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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