Shibaura ST321
Power
21 hp
Production
unknown
Engine
Diesel, 3-cylinder
Transmission
Gear
Weight
1649 lbs [747 kg]
Drive
4WD
From the same series:
Introduction
Shibaura ST321 Compact Utility Tractor
The Shibaura ST321 is a compact utility tractor designed for versatile agricultural and landscaping applications. Manufactured in Matsumoto, Japan, this model belongs to the ST300 series and provides a balance of maneuverability and performance for small-scale operations.
Engine and Performance
The tractor is powered by a liquid-cooled, 3-cylinder Shibaura S773 diesel engine. With a displacement of 61.3 cubic inches (1.0 L) and a compression ratio of 23:1, the engine produces 21 horsepower at a rated speed of 2600 RPM. The system utilizes an electric starter and a 12V electrical architecture to ensure reliable ignition.
Transmission and Drivetrain
Operators can choose between two transmission types: a gear-driven transmission featuring 9 forward and 3 reverse speeds with a dry disc clutch, or an infinitely variable 2-range hydrostatic transmission. The tractor is equipped with four-wheel drive, power steering, wet disc brakes, and a mechanical rear differential lock to maintain traction and control across varied terrain.
Hydraulics and PTO
The hydraulic system utilizes an open-center design with a pump flow capacity of 4.9 gpm (18.5 lpm) and an operating pressure of 1849 psi (127.5 bar). For implement operation, the tractor features a Category I rear hitch with a lift capacity of 1474 lbs (668 kg). The rear PTO operates at 540 RPM, and a mid-mount PTO is available as an optional feature.
Dimensions and Operator Safety
The ST321 has a wheelbase of 55.3 inches (140 cm) and an overall length of 107.4 inches (272 cm). The machine weighs approximately 1650 lbs (750 kg) depending on the configuration. Safety is managed through a standard two-post folding ROPS (Roll-Over Protective Structure), and the operator station is designed to accommodate various tire options, including agricultural and lawn/turf configurations.
Conclusion
The Shibaura ST321 is an engineered solution for users requiring a compact, durable machine for light-duty utility work, turf management, or small-scale farming. Its combination of multiple transmission options and a robust hydraulic system allows it to interface with a wide range of standard implements.
Production Information of Shibaura, ST321
- Compact Utility tractor
- Built in Matsumoto, Japan
| Manufacturer | Shibaura |
|---|
Dimension and Tires Information of Shibaura, ST321
| Front tread | 33.3 inches [84 cm] |
|---|---|
| Wheelbase | 55.3 inches [140 cm] |
| Gear Height (ROPS) | 90 inches [228 cm] |
| Hydro Width | 46.8 inches [118 cm] |
| Length | 107.4 inches [272 cm] |
| Hydro Weight | 1649 lbs [747 kg] |
| Hydro Height (ROPS) | 88.2 inches [224 cm] |
| Gear Width | 44.8 inches [113 cm] |
| Rear tread | 35.3 to 37.7 inches [89 to 95 cm] |
| Hydro Clearance (front axle) | 8.8 inches [22 cm] |
| Gear Clearance (front axle) | 10.6 inches [26 cm] |
| Gear Weight | 1662 lbs [753 kg] |
| Ag front | 6-12 |
|---|---|
| Lawn/turf rear | 29x12.00-15 |
| Ag rear | 9.5-16 |
| Lawn/turf front | 20x8.00-10 |
Engine Specifications of Shibaura, ST321
- Shiabaura S773
- Liquid-cooled
- Diesel
- 3-cylinder
| Starter volts | 12 |
|---|---|
| Displacement | 61.3 ci [1.0 L] |
| Compression | 23:1 |
| Bore/Stroke | 3.03x2.83 inches [77 x 72 mm] |
| Coolant capacity | 3.7 qts [3.5 L] |
| Oil capacity | 3.5 qts [3.3 L] |
| Starter | Electric |
| Rated RPM | 2600 |
| Power | 21 hp [15.7 kW] |
Transmission Information of Shibaura, ST321
Transmission variants 1
| Type | Gear |
|---|---|
| Gears | 9 forward and 3 reverse |
| Clutch | Dry disc |
Transmission variants 2
| Type | Hydrostatic |
|---|---|
| Gears | Infinite forward and reverse (2-range) |
- 9-speed gear
- Hydrostatic
Mechanical Specs of Shibaura, ST321
- Four-wheel drive
- Two-post folding ROPS.
- Wet disc brakes
- Power steering
| Differential lock | Mechanical rear |
|---|
Power Information of Shibaura, ST321
| Mid PTO Type | 2000 |
|---|---|
| Gear Rear PTO | Transmission |
| Hydro Engine RPM | 561@2600 |
| Gear Engine RPM | 588@2600 |
| Hydro Rear PTO | Live |
| Gear Engine RPM | 2139@2600 |
| Mid PTO | Optional |
| Rear PTO Type | 540 (1.375) |
| Hydro Engine RPM | 2040@2600 |
Hydraulics Specifications of Shibaura, ST321
| Type | Open center |
|---|---|
| Pump flow | 4.9 gpm [18.5 lpm] |
| Capacity | 4.2 gal [15.9 L] |
| Pressure | 1849 psi [127.5 bar] |
Three-Point Hitch of Shibaura, ST321
| Rear Type | I |
|---|---|
| Rear lift | 1474 lbs [668 kg] |
Electrical System of Shibaura, ST321
| Ground | Negative |
|---|---|
| Battery volts | 12 |
| Charging volts | 14 |
| Charging system | Alternator |
| Charging amps | 40 |
Where it sits
With 21 HP, the Shibaura ST321 sits between ST318 (18 HP) and ST324 (24 HP) in Shibaura's range.
Frequently asked questions
How much horsepower does the Shibaura ST321 have?
The Shibaura ST321 delivers 21 HP.
What years was the Shibaura ST321 produced?
The Shibaura ST321 was produced in unknown.
What engine does the Shibaura ST321 have?
The Shibaura ST321 is powered by a Diesel, 3-cylinder engine.
What transmission does the Shibaura ST321 use?
The Shibaura ST321 uses a Gear transmission.
How much does the Shibaura ST321 weigh?
The Shibaura ST321 weighs 1649 lbs [747 kg].
Is the Shibaura ST321 4WD?
The Shibaura ST321 is available in 4WD.