Kubota B2231 compact utility tractor specs and service data

The Kubota B2231 is a compact utility tractor model from the B2 series, manufactured from 2018 by Kubota. It was available in four-wheel drive (4WD) version.

The Kubota B2231 is equipped with a 1.1 L (68.5 cu·in) three-cylinder diesel engine with 78.0 mm (3.07 in) of the cylinder bore and 78.4 mm (3.09 in) of the piston stroke, and one of two transmissions: a gear type transmission with 9 forward and 9 reverse gears or a hydrostatic transmission with infinite (3-range) forward and reverse gears.

The Kubota B2231 compact utility tractor features:

The Kubota D1105 diesel engine which produces 23 PS (16.9 kW; 22.7 HP) at 2,500 rpm of horsepower.
Power steering
Multi plate wet disc brakes
Open operator station with two-post ROPS or Cab (option)
Category I rear hitch with 970 kg (2,140 lbs) of maximum lift capacity
Optional middle PTO with 2,500 rpm
Independent rear PTO with 540 rpm

General specifications

General Specifications
Model	Kubota B2231
Tractor type	Compact utility tractor
Production years	2018-
Factory	–
Dimensions and weight
Length	2,730 mm (107.5 in)
Width	1,234 mm (48.6 in)
Height	2,327 mm (91.6 in)
Wheel base	1,500 mm (59.1 in)
Ground clearance	265 mm (10.4 in)
Weight	755 kg (1,664 lbs)
Fuel capacity
Fuel tank capacity	27.0 liters (7.1 US gal.; 5.9 Imp. gal)

Engine

Engine Specifications
Engine model	Kubota D1105
Engine type	4-stroke, SOHC, three-cylinders
Displacement	1.1 L, 1,123 cm³, (68.5 cu·in)
Bore and stroke	78.0 mm X 78.4 mm (3.07 in X 3.09 in)
Max. horsepower	23 PS (16.9 kW; 22.7 HP) at 2,500 rpm
Cooling system	Liquid-cooled
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 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	Power
Brakes	Multi plate wet disc
Transmission
Transmission manufacturer or model	–
Transmission type	Gear type
Gears	9 forward and 9 reverse
Speed	Forward: 20.1 kmh (12.5 mph) Reverse: 18.4 kmh (11.4 mph)
Transmission № 2
Transmission manufacturer or model	–
Transmission type	Hydrostatic
Gears	Infinite (3-range) forward and reverse
Speed	Forward: 21.7 kmh (13.5 mph) Reverse: 17.3 kmh (10.8 mph)

Tires

Tires
Front tires	Ag: 6-12
Rear tires	Ag: 9.5-16

Rear Hitch

Three-Point Hitch
Category	I
Control type	Position control
Lift capacity (at ends)	970 kg (2,140 lbs)

PTO (Power take-off shaft)

PTO
Middle PTO type	Optional
Middle PTO speed	2,500 rpm
Rear PTO type	Independent
Rear PTO speed	540 rpm

Electrical system

Electrical system
Ground	Negative
Charging system	Alternator
Charging amps	–
Battery	12V

Hydraulic system

Hydraulic system
Hydraulic type	Open center
Pump flow	8.7 gpm (32.9 lpm)

Attachments

Kubota 54″ mid-mount mower deck with 3-blade
Cutting width	1,370 mm (54 in)
Weight	148 kg (328 lb)
Cut height	30-100 mm (1.5 to 4 in)
Kubota 60″ mid-mount mower deck with 3-blade
Cutting width	1,520 mm (60 in)
Weight	160 kg (353 lb)
Cut height	30-100 mm (1.5 to 4 in)
Kubota LA424EC Loader
Height (to pin):	1,910 mm (75.4 in)
Clearance, dumped bucket:	1,440 mm (56.9 in)
Dump angle:	44°
Rollback angle:	25°
Lift to full height (at pin):	420 kg (926 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 B2231