Kubota GT-21
The Kubota GT-21 is a tractor produced by Kubota. It is equipped with a 85 ci 1.4 L engine. The listed engine power is Diesel (listed): 20.7 hp / 15.4 kW. Transmission: infinite forward and reverse (3-range). Operating weight: 1940 to 2028 pounds.
Engine Power
Diesel (listed): 20.7 hp / 15.4 kW
Fuel & Capacities
7.4 gal
28.0 L
Transmission
infinite forward and reverse (3-range)
Operating Weight
1940 to 2028 pounds
Overview
 | 2001 - 2002
GT SeriesCompact Utility tractor
GT Series
Compact Utility tractor |
|---|
Production | |
|---|---|
Manufacturer | Kubota |
Compact Utility tractor | |
Variants | |
|---|---|
GT-21 | gear |
GT-21F | hydrostatic |
GT-21J | large tire |
Kubota GT-21 Engine | |
|---|---|
Kubota 1.4L 3-cyl diesel | |
Fuel tank | 7.4 gal
28.0 L |
Engine details ...  | |
Kubota GT-21 Power | |
|---|---|
Engine | 20.7 hp
15.4 kW |
Mechanical | |
|---|---|
Four-wheel drive | |
Two-post folding ROPS. |
Tractor hitch | |
|---|---|
Rear Type | 1 |
Power Take-off (PTO) | |
|---|---|
Rear PTO Type | 540/750/1000 (1.375) |
Dimensions & Tires | |
|---|---|
Wheelbase | 57.1 inches
145 cm |
Weight | 1940 to 2028 pounds |
Front tire | 6-14 |
Rear tire | 8.3-24 |
Full dimensions and tires ...  | |
Electrical | |
|---|---|
Ground | negative |
Battery volts | 12 |
Engine
Engine Detail — 85 ci / 1.4 L Diesel
Manufacturer | Kubota D1403 |
Fuel Type | Diesel |
Configuration | 3-cylinder, liquid-cooled |
Displacement | 85 ci
1.4 L |
Bore/Stroke | 3.1x3.6 inches
79 x 91 mm |
Power | 20.7 hp
15.4 kW |
Rated RPM | 2600 |
Starter | electric |
Starter volts | 12 |
Transmission
Transmission options | |
|---|---|
12-speed | |
hydrostatic |
Transmission — 12 forward and 4 reverse
Gears | 12 forward and 4 reverse |
Three gears (1-3), plus reverse, in four ranges (creeper and 1-3). | |
 | |
Transmission — infinite forward and reverse (3-range) hydrostatic
Type | hydrostatic |
Gears | infinite forward and reverse (3-range) |
 | |
Dimensions
Kubota GT-21 Tires | |
|---|---|
Standard tires (ag) | Front: 6-14. Rear: 8.3-24 |
GT-21J Optional tires (ag) | Front: 6-14. Rear: 9.5-22 |
Dimensions | |
|---|---|
Wheelbase | 57.1 inches
145 cm |
Length | 110.4 inches
280 cm |
Width | 45.3 inches
115 cm |
Height (ROPS) | 74.6 inches
189 cm |
Height (cab) | 74.6 inches
189 cm |
Gear Weight | 1940 lbs
879 kg |
Hydro Weight | 2028 lbs
919 kg |
Ground clearance | 12.6 inches
32 cm |
Front tread | 37.4 inches
94 cm |
Rear tread | 36 to 40.8 inches
91 to 103 cm |
Photos
Kubota GT-21 tractor photo
Recommended Implements & Sizing Guide
Engineering recommendations for Kubota GT-21 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 GT-21.
Estimated Continuous Field Runtime: 6.9 hrs
Approximately 6.9 hours of continuous field operation at ~75% rated power on a full tank (7.4 gal / 28 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 GT-21 Specification Unit Converter
Convert power, fluid capacities, and operating weights between metric and imperial standards for Kubota GT-21.
Converted Equivalents:
Horsepower (HP)20.7 hp
Kilowatts (kW)15.4 kW
Metric Horsepower (PS / CV)21 PS
Direct Competitor Comparison
Compare Kubota GT-21 against same-era industry alternatives in the same horsepower class.
Current Model
Kubota
Kubota GT-21
Engine Power:Diesel (listed): 20.7 hp / 15.4 kW
★ Baseline Reference
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