Kubota KB21X
The Kubota KB21X is a tractor produced by Kubota. It is equipped with a 68.5 ci 1.1 L engine. The listed engine power is Diesel (listed): 20.7 hp / 15.4 kW. Transmission: Glideshift. Operating weight: 1554 to 1951 pounds.
Engine Power
Diesel (listed): 20.7 hp / 15.4 kW
Fuel & Capacities
7.1 gal
26.9 L
Transmission
Glideshift
Operating Weight
1554 to 1951 pounds
Overview
 | 2009 - 2014
KB Kingbull Extra SeriesSub-Compact Utility tractor
KB Kingbull Extra Series
Sub-Compact Utility tractor |
|---|
Production | |
|---|---|
Manufacturer | Kubota |
Sub-Compact Utility tractor | |
Variants | |
|---|---|
KB21X | wheeled |
KB21X-PC | half-track |
Kubota KB21X Engine | |
|---|---|
Kubota 1.1L 3-cyl diesel | |
ROPS Fuel tank | 7.1 gal
26.9 L |
Cab Fuel tank | 5.6 gal
21.2 L |
Engine details ...  | |
Kubota KB21X Power | |
|---|---|
Engine | 20.7 hp
15.4 kW |
Mechanical | |
|---|---|
Four-wheel drive | |
Power steering | |
Mechanical wet disc brakes | |
Two-post ROPS. Cab optional with air-conditioning. |
Tractor hitch | |
|---|---|
Rear Type | 0 |
Power Take-off (PTO) | |
|---|---|
Rear PTO Type | 540 (1.375) |
Engine RPM | 530@2600 |
799@2600 | |
1182@2600 | |
-662@2600 | |
Dimensions & Tires | |
|---|---|
ROPS Wheelbase | 53.2 inches
135 cm |
Cab Wheelbase | 53.7 inches
136 cm |
Weight | 1554 to 1951 pounds |
Front tire | 6.00-12 |
Rear tire | 9.5-20 |
Full dimensions and tires ...  | |
Electrical | |
|---|---|
Ground | negative |
Battery volts | 12 |
Engine
Engine Detail — 68.5 ci / 1.1 L Diesel
Manufacturer | Kubota D1105 |
Fuel Type | Diesel |
Configuration | 3-cylinder, liquid-cooled |
Displacement | 68.5 ci
1.1 L |
Bore/Stroke | 3.07x3.09 inches
78 x 78 mm |
Power | 20.7 hp
15.4 kW |
Rated RPM | 2600 |
Starter | electric |
Starter volts | 12 |
Transmission
Transmission options | |
|---|---|
9-speed | |
36-speed power shift |
Transmission — 9 forward and reverse
Gears | 9 forward and reverse |
Clutch | dry disc |
Three gears (1-3) in three ranges with shuttle shift. | |
 | |
Transmission — Glideshift
Transmission | Glideshift |
Type | power shift |
Gears | 36 forward and 24 reverse |
Sequential hydraulically-shifted transmission. Twelve forward gears with three ranges. Tractor must be stopped, and clutch used, to shift ranges. | |
 | |
Dimensions
Kubota KB21X Tires | |
|---|---|
Standard tires (ag) | Front: 6.00-12. Rear: 9.5-20 |
Dimensions | |
|---|---|
ROPS Wheelbase | 53.2 inches
135 cm |
Cab Wheelbase | 53.7 inches
136 cm |
ROPS Length | 92.3 inches
234 cm |
Cab Length | 97.6 inches
247 cm |
ROPS Width | 44.5 inches
113 cm |
Cab Width | 47.6 inches
120 cm |
Height (ROPS) | 74.8 inches
189 cm |
Height (cab) | 77.2 inches
196 cm |
Ground clearance | 13.8 inches
35 cm |
Front tread | 33.5 inches
85 cm |
ROPS Rear tread | 35 inches
88 cm |
Cab Rear tread | 38.2 inches
97 cm |
Kubota KB21X Weight | |
|---|---|
ROPS gear | 1554 lbs
704 kg |
ROPS Glideshift | 1609 lbs
729 kg |
Cab gear | 1896 lbs
860 kg |
Cab Glideshift | 1951 lbs
884 kg |
Photos
Kubota KB21X tractor photo
Recommended Implements & Sizing Guide
Engineering recommendations for Kubota KB21X based on its 20.7 HP power envelope and ASAE agricultural standards.
| Implement & Operation | Recommended Size | Workload Rating | Engineering Notes |
|---|---|---|---|
Moldboard PlowPrimary Tillage | 1 to 2 Bottom (12")1 - 2 铧 (30 cm) | Light Duty | Ideal for garden plots and light sandy soil. |
Rotary Cutter / MowerMowing & Clearing | 4 ft (48 in)1.2 m | Light Duty | Pasture clipping and light brush under 1" diameter. |
Rotary TillerSeedbed Prep | 42 to 48 in105 - 120 cm | Light Duty | Covers compact tractor tire width. |
Disc HarrowSecondary Tillage | 5 to 6 ft (16-18" discs)1.5 - 1.8 m (40-45 cm 耙片) | Light Duty | Small acreage soil break-up and secondary aeration. |
Sizing & Soil Condition NoteActual implement sizing varies depending on local soil conditions (heavy clay vs sandy loam), field slope, and operating speed. Heavy tillage implements may require front ballast weights and wheel weights.
Fluids, Capacities & Working Autonomy
Standard fluid requirements, service intervals, and continuous runtime estimates for Kubota KB21X.
Estimated Continuous Field Runtime: 6.6 hrs
Approximately 6.6 hours of continuous field operation at ~75% rated power on a full tank (7.1 gal / 26.9 L).
Estimated 75% Load Fuel Burn~1.1 gal/hr (4.1 L/hr)
Engine Crankcase Oil
SAE 15W-40 (Heavy Duty Diesel)
Standard Spec: API CK-4 / CJ-4 Heavy Duty
Service Interval: 150 – 250 Hours
Transmission & Hydraulic System
UTTO (Universal Tractor Transmission Oil)
Standard Spec: ISO VG 46 / 68 (Wet Brake & Trans Compatible)
Service Interval: 600 – 1000 Hours
Engine Cooling System
50/50 Ethylene Glycol Pre-mix
Standard Spec: ASTM D6210 / Heavy-Duty OAT Antifreeze
Service Interval: 2 Years / 1500 Hours
Kubota KB21X Specification Unit Converter
Convert power, fluid capacities, and operating weights between metric and imperial standards for Kubota KB21X.
Converted Equivalents:
Horsepower (HP)20.7 hp
Kilowatts (kW)15.4 kW
Metric Horsepower (PS / CV)21 PS
Direct Competitor Comparison
Compare Kubota KB21X against same-era industry alternatives in the same horsepower class.
Current Model
Kubota
Kubota KB21X
Engine Power:Diesel (listed): 20.7 hp / 15.4 kW
★ Baseline Reference
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