Compare/Kubota B7510 vs Kubota KB21X

Kubota B7510 vs Kubota KB21X

Verdict: Kubota B7510 vs Kubota KB21X

The Kubota B7510 and the Kubota KB21X are both tractors — here is how they stack up on the figures that matter. Both are rated at the same 21 hp. Kubota B7510 is the lighter machine (1,323 kg vs 1,554 kg), which helps on soft ground and transport, while the heavier model carries more ballast for traction-limited draft work. Kubota KB21X holds more fuel (26.9 L vs 20.1 L) for longer stints between fills. Kubota KB21X is the newer design (2009 vs 2004). Use the full side-by-side spec tables below to weigh the details against your own operation, and confirm with a dealer demo.

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Tell us about your operation

Acreage600 acBudgetMain crop / use

Fit & specs

Kubota

Fit score

Best match

Clear

Kubota

Fit score

Best match

Clear

Rated power

21 hp

Confidence

98%

Guide price

—

Overview

Manufacturer

KubotaReference

liquid-cooled inlineReference

Sequential hydraulically-shifted transmission. Twelve forward gears with three ranges. Tractor must be stopped, and clutch used, to shift ranges.Reference

Final drives

spur gearReference

—

Differential lock

mechanical rearReference

—

Steering

power assistReference

—

Variants

B7510DT

gearReference

—

B7510DTN

narrowReference

—

B7510HSD

hydrostaticReference

—

KB21X

—

wheeledReference

KB21X-PC

—

half-trackReference

Engine

Fuel tank

20.1 LReference

26.9 LReference

Engine (gross)

15.7 kWReference

—

Displacement

1.0 LReference

1.1 LReference

Bore/Stroke

76 x 74 mmReference

78 x 78 mmReference

Power (gross)

15.7 kWReference

—

Air cleaner

dual paper elementReference

—

Rated RPM

2600Reference

Torque

59.7 NmReference

—

Starter volts

12Reference

Oil capacity

13.5 LReference

—

Coolant capacity

3.8 LReference

—

Fuel Type

DieselReference

dieselReference

No of Cylinders

3 CylinderReference

3 cylinderReference

Rated engine speed

2,600 RPMReference

Engine torque at rated speed

20 kgReference

—

Bore and stroke

2.992x2.898 inchesReference

3.07x3.09 inchesReference

Cooling system

liquid-cooledReference

ROPS Fuel tank

—

26.9 LReference

Cab Fuel tank

—

21.2 LReference

Engine

—

15.4 kWReference

Power

—

15.4 kWReference

Starter

—

electricReference

Transmission

Gear Weight

600 kgReference

—

Gears

6 forward and 2 reverseReference

36 forward and 24 reverseReference

Clutch

dry discReference

Transmission Type

HSTReference

PowershiftReference

ROPS gear

—

704 kgReference

Cab gear

—

860 kgReference

Transmission

—

GlideshiftReference

forward and reverse options

—

9 F and 9 R | Power Shift : 36 F and 24 RReference

Wheel Drive

—

4WDReference

PTO & Hydraulics

Gear PTO (claimed)

12.7 kWReference

—

Hydro PTO (claimed)

11.9 kWReference

—

Type

gearReference

power shiftReference

Valves

2 (DTN)Reference

—

Pump flow

16.7 lpmReference

—

Total flow

26.5 lpmReference

—

Steering flow

9.8 lpmReference

—

Rear Type

IReference

0Reference

Control

position control (DTN)Reference

—

Rear lift (at ends)

750 kgReference

—

Rear lift (at 24"/610mm)

750 kgReference

—

Gear Rear PTO

transmissionReference

—

Hydro Rear PTO

independentReference

—

Rear PTO Type

540 (1.375)Reference

Engine RPM

960Reference

-662@2600Reference

Mid PTO Type

2500Reference

—

Dimensions

Wheelbase

150 cmReference

136.4 cmReference

Weight

383 kgReference

1554 to 1951 poundsReference

Front tire

6-12Reference

6.00-12Reference

Rear tire

9.5-16Reference

9.5-20Reference

Standard tires (ag)

Front: 5-12. Rear: 8-16 (DTN)Reference

Front: 6.00-12. Rear: 9.5-20Reference

Length

230 cmReference

—

DTN Length

227 cmReference

—

Width

107 cmReference

—

DTN Width

89 cmReference

—

Hydro Weight

620 kgReference

—

Ground clearance

30 cmReference

35 cmReference

DTN Ground clearance

29 cmReference

—

Steering wheel

132 cmReference

—

DTN Steering wheel

130 cmReference

—

ROPS Wheelbase

—

135 cmReference

Cab Wheelbase

—

136 cmReference

ROPS Length

—

234 cmReference

Cab Length

—

247 cmReference

ROPS Width

—

113 cmReference

Cab Width

—

120 cmReference

Height (ROPS)

—

189 cmReference

Height (cab)

—

196 cmReference

Front tread

—

85 cmReference

ROPS Rear tread

—

88 cmReference

Cab Rear tread

—

97 cmReference

ROPS Glideshift

—

729 kgReference

Cab Glideshift

—

884 kgReference

Kubota B7510 attachments

Electrical

Ground

negativeReference

Battery CCA

433Reference

—

Battery volts

12Reference

Total cold cranking amps

433Reference

—

Attachment overview

Kubota B4672 Backhoe

Backhoe type

Kubota B4672 BackhoeReference

—

Transport height

171 cmReference

—

Bucket width

60 cmReference

—

Digging depth

187 cmReference

—

Reach from pivot

249 cmReference

—

Loading height

165 cmReference

—

Bucket Rotation

180°Reference

—

Swing Arc

180°Reference

—

Bucket force

1338 kgReference

—

Dipperstick force

789 kgReference

—

Kubota B7510 Height

ROPS

194 cmReference

—

DTN ROPS

191 cmReference

—

General

Make & Model

KubotaReference

Rollover protective structure

Two-post ROPSReference

Two-post ROPS.Reference

Capacities

Capacity

61.1 ciReference

68.5 ciReference

Crankcase oil volume

3.2 qtsReference

—

PTO

Rear PTO Power

AvailableReference

—

Rear PTO RPM

960 RPMReference

540 RPMReference

Mid PTO

AvailableReference

—

Mid PTO RPM

2,500 RPMReference

—

Engine Speed on Rear PTO speed

—

1,182@2,600 RPMReference

Steering & brakes

Brakes

wet discReference

mechanical wet discReference

Steering type

power assistReference

powerReference

Hydraulics

Hydraulics Type

open centerReference

—

Remote Valves

1 valvesReference

—

Steering & Implements flow

2.6 gpm (4.4 gpm)Reference

—

Rear Hitch category (SAE designation)

Category IReference

Category 0Reference

Rear Hitch maximum lift capacity

615.1 kgReference

—

Rear Hitch Sensing Type

quarter inching valve | position control (DTN)Reference

—

Dimensions & weight

Height Over ROPS

194.1 cmReference

190 cmReference

Overall Length

230.1 cmReference

247.9 cmReference

Overall Width

107.7 cmReference

120.9 cmReference

Height Over Cab

—

196.1 cmReference

Overall weight

—

704.9 kgReference

Wheels & tyres

Rear Wheel Type

Standard tires (ag) : Rear: 9.5-16Reference

Ag: 9.5-20Reference

Front Wheel Type

Standard tires (ag)\\tFront: 6-12.Reference

Ag: 6.00-12Reference

Rear wheel tread range

—

97 cmReference

Front Wheel tread range

—

85.1 cmReference

Power

Max Power

—

20.7 hpReference

Operator station

Cab Availability

—

AvailableReference

Fit score weighs budget, operation size, crop match and data confidence against the details above. It’s guidance, not advice — always confirm with a dealer demo.