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Shibaura ST321

The Shibaura ST321 is a compact utility tractor built in Matsumoto, Japan by Shibaura. It features a 1.0L 3-cylinder liquid-cooled diesel engine producing 21 hp (15.7 kW) with a 9-speed gear or hydrostatic transmission option. The tractor includes four-wheel drive, mechanical rear differential lock, power steering, wet disc brakes, and a two-post folding ROPS. It has a fuel capacity of 5.3 gallons (20.1 L) and a hydraulic system capacity of 4.2 gallons (15.9 L) with an open center type hydraulic system. The PTO offers both gear and hydrostatic rear PTO options with a 540 RPM rear PTO and an optional mid PTO at 2000 RPM. Dimensions include a 55.3 inch (140 cm) wheelbase, length of 107.4 inches (272 cm), and weight ranging from 1649 to 1662 pounds depending on transmission type. Tires vary for agricultural and lawn/turf use. Electrical system is negative ground with a 40 amp alternator charging a 12 volt battery.
Shibaura ST321compact utility tractor21 hp tractorShibaura tractor specsST321 engineST321 transmissionST321 dimensions
Power21 hp
Foundedunknown
ModelST321

Technical Specifications

Detailed specifications and technical data for Shibaura ST321

Power

Engine:21 hp (15.7 kW)
PTO (claimed):17 hp (12.7 kW)

Tires

Ag rear:9.5-16
Ag front:6-12
Lawn/turf rear:29x12.00-15
Lawn/turf front:20x8.00-10

Engine

Type:diesel
Model:Shiabaura S773
Power:21 hp (15.7 kW)
Cooling:liquid-cooled
Starter:electric
Cylinders:3-cylinder
Rated RPM:2600
Bore/Stroke:3.03x2.83 inches (77 x 72 mm)
Compression:23:1
Displacement:61.3 ci (1.0 L)
Oil capacity:3.5 qts (3.3 L)
Starter volts:12
Coolant capacity:3.7 qts (3.5 L)

Capacity

Fuel:5.3 gal (20.1 L)
Hydraulic system:4.2 gal (15.9 L)

Dimensions

Length:107.4 inches (272 cm)
Wheelbase:55.3 inches (140 cm)
Gear Width:44.8 inches (113 cm)
Rear tread:35.3 to 37.7 inches (89 to 95 cm)
Front tread:33.3 inches (84 cm)
Gear Weight:1662 lbs (753 kg)
Hydro Width:46.8 inches (118 cm)
Hydro Weight:1649 lbs (747 kg)
Gear Height (ROPS):90 inches (228 cm)
Hydro Height (ROPS):88.2 inches (224 cm)
Gear Clearance (front axle):10.6 inches (26 cm)
Hydro Clearance (front axle):8.8 inches (22 cm)

Electrical

Ground:negative
Battery volts:12
Charging amps:40
Charging volts:14
Charging system:alternator

Hydraulics

Type:open center
Capacity:4.2 gal (15.9 L)
Pressure:1849 psi (127.5 bar)
Pump flow:4.9 gpm (18.5 lpm)

Mechanical

ROPS:Two-post folding ROPS
Drive:Four-wheel drive
Brakes:Wet disc brakes
Power steering:yes
Differential lock:mechanical rear

Production

Type:Compact Utility tractor
Built in:Matsumoto, Japan
Manufacturer:Shibaura

Transmission

Gear Type:gear
Gear Gears:9 forward and 3 reverse
Gear Clutch:dry disc
Hydrostatic Type:hydrostatic
Hydrostatic Gears:infinite forward and reverse (2-range)
Transmission options:9-speed gear, hydrostatic

Tractor hitch

Rear Type:I
Rear lift:1474 lbs (668 kg)

Power Take-off (PTO)

Mid PTO:optional
Mid PTO Type:2000
Gear Rear PTO:transmission
Rear PTO Type:540 (1.375)
Hydro Rear PTO:live
Gear Engine RPM:588@2600
Hydro Engine RPM:561@2600
Gear Engine RPM (Mid PTO):2139@2600
Hydro Engine RPM (Mid PTO):2040@2600

Related Models

Shibaura ST318

Model:ST318

Shibaura ST324

Model:ST324