Kubota GL21
The Kubota GL21 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: 16 forward and reverse. Operating weight: 2293 lbs 1040 kg.
Engine Power
Diesel (listed): 20.7 hp / 15.4 kW
Fuel & Capacities
7.1 gal
26.9 L
Transmission
16 forward and reverse
Operating Weight
2293 lbs
1040 kg
Overview
 | 1990 - 1992
GL SeriesCompact Utility tractor
GL Series
Compact Utility tractor |
|---|
Production | |
|---|---|
Manufacturer | Kubota |
Compact Utility tractor | |
Kubota GL21 Engine | |
|---|---|
Kubota 1.4L 3-cyl diesel | |
Fuel tank | 7.1 gal
26.9 L |
Engine details ...  | |
Kubota GL21 Power | |
|---|---|
Engine | 20.7 hp
15.4 kW |
Mechanical | |
|---|---|
Four-wheel drive | |
Power steering | |
Mechanical wet disc brakes | |
Open operator station. |
Tractor hitch | |
|---|---|
Rear Type | I |
Power Take-off (PTO) | |
|---|---|
Rear PTO Type | 568/803/985/1304 (1.375) |
Dimensions & Tires | |
|---|---|
Wheelbase | 61 inches
154 cm |
Weight | 2293 lbs
1040 kg |
Front tire | 6-14 |
Rear tire | 9.5-32 |
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 | |
|---|---|
16-speed gear | |
16-speed power shift |
Transmission — 16 forward and reverse gear
Type | gear |
Gears | 16 forward and reverse |
Four gears (1-4) in low/high ranges plus a creeper/field range shift with shuttle. | |
 | |
Transmission — 16 forward and reverse power shift
Type | power shift |
Gears | 16 forward and reverse |
Eight power shift gears in two ranges with shuttle. | |
Dimensions
Kubota GL21 Tires | |
|---|---|
Standard tires (ag) | Front: 6-14. Rear: 9.5-32 |
Dimensions | |
|---|---|
Wheelbase | 61 inches
154 cm |
Length | 116.1 inches
294 cm |
Width | 50.2 inches
127 cm |
Height | 56.7 inches
144 cm |
Weight | 2293 lbs
1040 kg |
Ground clearance | 13.2 inches
33 cm |
Front tread | 37.4 inches
94 cm |
Rear tread | 39.8/44.5 inches
101/113 cm |
Photos
Kubota GL21
Recommended Implements & Sizing Guide
Engineering recommendations for Kubota GL21 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 GL21.
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 GL21 Specification Unit Converter
Convert power, fluid capacities, and operating weights between metric and imperial standards for Kubota GL21.
Converted Equivalents:
Horsepower (HP)20.7 hp
Kilowatts (kW)15.4 kW
Metric Horsepower (PS / CV)21 PS
Direct Competitor Comparison
Compare Kubota GL21 against same-era industry alternatives in the same horsepower class.
Current Model
Kubota
Kubota GL21
Engine Power:Diesel (listed): 20.7 hp / 15.4 kW
★ Baseline Reference
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