Kubota KB21X Tractor

Manufacturer	Kubota
Price	-
Model	KB21X
Equipment Type	Sub-Compact Utility Tractors
Factory

KUBOTA KB21X POWER

Engine

20.7hp / 15.4kW

ENGINE DETAIL

The Kubota KB21X features a compact D1105 diesel engine, offering a balance of efficiency and performance at 20.7hp, making it suitable for small to medium agricultural tasks. Its liquid-cooled, three-cylinder design enhances longevity and operational stability, while a 2600 RPM rating ensures adequate power delivery for demanding applications. However, its limited displacement of 1.1L may pose constraints for heavy-duty operations, necessitating careful matching to implement requirements.

Description	Kubota D1105 diesel 3-cylinder liquid-cooled
Displacement	68.5ci / 1.1L
Bore/Stroke	3.07x3.09inches / 78x 78mm
Power	20.7hp / 15.4kW
Rated RPM	2600
Starter	electric
Starter volts	12

KUBOTA KB21X ENGINE

The Kubota KB21X features a 1.1L 3-cylinder diesel engine, providing a compact and efficient power-to-weight ratio ideal for small to medium farming tasks. With a ROPS fuel tank capacity of 7.1 gallons (26.9L) and an optional cab tank of 5.6 gallons (21.2L), operators can benefit from extended operational time between refuels, though the smaller cab tank may require more frequent refills in heavy-use scenarios. Overall, this tractor combines versatility with fuel efficiency, making it suitable for tight spaces and diversified agricultural activities.

Description	Kubota 1.1L 3-cyl diesel
ROPS Fuel tank	7.1gal / 26.9L
Cab Fuel tank	5.6gal / 21.2L

TRANSMISSIONS OVERVIEW

The Kubota KB21X tractor features a versatile 9-speed transmission coupled with a 36-speed power shift system, providing enhanced operational flexibility for various farming tasks. The 36-speed option allows for precise control over speed and torque, beneficial for tasks requiring fine adjustments, such as tilling or planting. However, the complexity of the power shift system may require additional operator training to fully optimize performance and minimize potential mechanical issues.

Description

9-speed 36-speed power shift

TRANSMISSION 1

The Kubota KB21X tractor features a 9-speed transmission with forward and reverse gears, enhancing maneuverability during operations such as fieldwork and transport. Its dry disc clutch offers reliable power transfer but may require more maintenance compared to wet clutches in heavy-duty applications. The shuttle shift mechanism, providing three gears across three ranges, facilitates quick gear changes, making it advantageous for tasks requiring frequent speed adjustments, such as plowing or hauling.

Gears	9 forward and reverse
Clutch	dry disc
Description	Three gears (1-3) in three ranges with shuttle shift

TRANSMISSION 2

The Kubota KB21X features a power shift Glideshift transmission, offering a robust 36 forward and 24 reverse gears for versatile operation. Its sequential hydraulically-shifted system enhances precision in speed selection, although shifting ranges requires the tractor to be stationary and the clutch to be engaged, which can slow operational efficiency. This setup is ideal in applications requiring frequent speed adjustments, but may pose a challenge in high-intensity work scenarios needing quick range changes.

Transmission	Glideshift
Type	power shift
Gears	36 forward and 24 reverse
Description	Sequential hydraulically-shifted transmission. Twelve forward gears with three ranges. Tractor must be stopped, and clutch used, to shift ranges

MECHANICAL

The Kubota KB21X tractor features a robust 4x4 MFWD drivetrain, enhancing traction and stability in diverse terrains, which is ideal for agricultural applications. Its 9-speed transmission provides flexibility, while the optional 36-speed power shift allows for seamless gear changes under load, improving operational efficiency. The mechanical wet disc brakes deliver reliable stopping power, though they may require more maintenance compared to hydraulic systems; hence, proper upkeep is essential for optimal performance.

Chassis	4x4 MFWD 4WD
Steering	power
Brakes	mechanical wet disc
Cab	Two-post ROPS. Cab optional with air-conditioning
Transmissions	9-speed 36-speed power shift

POWER TAKE-OFF (PTO)

Rear RPM	540 (1.375)
Engine RPM	530@2600 / 799@2600 / 1182@2600/-662@2600

KUBOTA KB21X TIRES

The Kubota KB21X tractor is equipped with agricultural tires that enhance traction and stability in various field conditions. The front tire size of 6.00-12 and rear size of 9.5-20 provide a balanced load distribution, optimizing performance in both cultivation and transport scenarios. However, users should consider potential limitations in maneuverability on compacted surfaces due to tire width and profile.

Standard tires (ag)

Front: 6.00-12. Rear: 9.5-20

DIMENSIONS

ROPS Wheelbase	53.2inches / 135cm
Cab Wheelbase	53.7inches / 136cm
ROPS Length	92.3inches / 234cm
Cab Length	97.6inches / 247cm
ROPS Width	44.5inches / 113cm
Cab Width	47.6inches / 120cm
Height (ROPS)	74.8inches / 189cm
Height (cab)	77.2inches / 196cm
Ground clearance	13.8inches / 35cm
Front tread	33.5inches / 85cm
ROPS Rear tread	35inches / 88cm
Cab Rear tread	38.2inches / 97cm

KUBOTA KB21X WEIGHT

ROPS gear	1554lbs / 704kg
ROPS Glideshift	1609lbs / 729kg
Cab gear	1896lbs / 860kg
Cab Glideshift	1951lbs / 884kg

DIMENSIONS & TIRES

The Kubota KB21X tractor features a compact design with a narrow wheelbase of 53.2 inches (ROPS) and 53.7 inches (Cab), enhancing maneuverability in confined agricultural spaces. Weighing between 1554 to 1951 pounds, it offers a balance between stability and ease of transport, but may limit towing capacity under heavier loads. The tire dimensions (front: 6.00-12; rear: 9.5-20) facilitate good traction and flotation in soft conditions, making it suitable for various tasks such as landscaping and small-scale farming.

ROPS Wheelbase	53.2inches / 135cm
Cab Wheelbase	53.7inches / 136cm
Weight	1554 to 1951 pounds
Front tire	6.00-12
Rear tire	9.5-20

ELECTRICAL

Ground	negative
Battery volts	12

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