Kubota B21 backhoe loader tractor specs and service data

The 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
Factory	–
Dimensions and weight
Length	–
Width	–
Height	–
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

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
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.)

Tires

Tires
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)

PTO
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)

Attachments

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.

Kubota B21