Kubota ST-30
The Kubota ST-30 is a tractor produced by Kubota. It is equipped with a 91.4 ci 1.5 L engine. The listed engine power is Diesel (listed): 28.7 hp / 21.4 kW. Transmission: infinite forward and reverse (3-range). Operating weight: 1962 to 2475 pounds.
Engine Power
Diesel (listed): 28.7 hp / 21.4 kW
Fuel & Capacities
7.1 gal
26.9 L
Transmission
infinite forward and reverse (3-range)
Operating Weight
1962 to 2475 pounds
Overview
 | 1997 - 2001
ST SeriesCompact Utility tractor
ST Series
Compact Utility tractor |
|---|
Production | |
|---|---|
Manufacturer | Kubota |
Compact Utility tractor | |
Kubota ST-30 Engine | |
|---|---|
Kubota 1.5L 4-cyl diesel | |
Fuel tank | 7.1 gal
26.9 L |
Engine details ...  | |
Kubota ST-30 Transmission | |
|---|---|
hydrostatic | |
Transmission details ...  |
Kubota ST-30 Power | |
|---|---|
Engine | 28.7 hp
21.4 kW |
PTO (claimed) | 23.2 hp
17.3 kW |
Mechanical | |
|---|---|
Four-wheel drive | |
Wet disc brakes | |
Two-post ROPS. Cab optional. |
Hydraulics | |
|---|---|
Pump flow | 5.6 gpm
21.2 lpm |
Tractor hitch | |
|---|---|
Rear Type | I |
Control | position control |
Rear lift (at 24"/610mm) | 1830 lbs
830 kg |
Power Take-off (PTO) | |
|---|---|
Rear PTO | independent |
Rear PTO Type | 540/800 |
Mid PTO Type | 1720/2490 |
Dimensions & Tires | |
|---|---|
Wheelbase | 63 inches
160 cm |
Weight | 1962 to 2475 pounds |
Front tire | 6.00-12 |
Rear tire | 9.5-22 |
Full dimensions and tires ...  | |
Electrical | |
|---|---|
Ground | negative |
Charging system | alternator |
Battery volts | 12 |
Engine
Engine Detail — 91.4 ci / 1.5 L Diesel
Manufacturer | Kubota V1505 |
Fuel Type | Diesel |
Configuration | 4-cylinder, liquid-cooled |
Displacement | 91.4 ci
1.5 L |
Bore/Stroke | 3.07x3.09 inches
78 x 78 mm |
Power | 28.7 hp
21.4 kW |
Rated RPM | 2600 |
Starter | electric |
Starter volts | 12 |
Transmission
Transmission — infinite forward and reverse (3-range) hydrostatic
Type | hydrostatic |
Gears | infinite forward and reverse (3-range) |
With 9.5-22 rear tires. | |
 | |
Dimensions
Kubota ST-30 Tires | |
|---|---|
Standard tires (ag) | Front: 6.00-12. Rear: 9.5-22 |
Lawn/turf front | 24x8.50-14 |
Lawn/turf rear | 13.6-16 |
Dimensions | |
|---|---|
Wheelbase | 63 inches
160 cm |
Length | 107.1 inches
272 cm |
Width | 47.2 inches*Minimum width with R1 tires.
119 cm |
Height (ROPS) | 90.5 inches
229 cm |
Height (cab) | 84.5 inches
214 cm |
ROPS Shipping weight | 1962 lbs
889 kg |
Cab Shipping weight | 2475 lbs
1122 kg |
Ground clearance | 9.3 inches
23 cm |
Front tread | 40.2 inches
102 cm |
Rear tread | 37.4 to 42.1 inches
94 to 106 cm |
Photos
Kubota ST-30
Kubota ST-30
Recommended Implements & Sizing Guide
Engineering recommendations for Kubota ST-30 based on its 28.7 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 | 5 ft (60 in)1.5 m | Medium Duty | Pasture maintenance and weeds up to 1.5" diameter. |
Rotary TillerSeedbed Prep | 54 to 60 in135 - 150 cm | Medium Duty | Thorough seedbed preparation in orchards and vegetable plots. |
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 ST-30.
Estimated Continuous Field Runtime: 4.8 hrs
Approximately 4.8 hours of continuous field operation at ~75% rated power on a full tank (7.1 gal / 26.9 L).
Estimated 75% Load Fuel Burn~1.5 gal/hr (5.6 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 ST-30 Specification Unit Converter
Convert power, fluid capacities, and operating weights between metric and imperial standards for Kubota ST-30.
Converted Equivalents:
Horsepower (HP)28.7 hp
Kilowatts (kW)21.4 kW
Metric Horsepower (PS / CV)29.1 PS
Direct Competitor Comparison
Compare Kubota ST-30 against same-era industry alternatives in the same horsepower class.
Current Model
Kubota
Kubota ST-30
Engine Power:Diesel (listed): 28.7 hp / 21.4 kW
★ Baseline Reference
International HarvesterMarket Competitor
International Harvester D-326
Engine Power:26
Production Years:1962 - 1965
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