Shibaura ST321 Specs, Price and Review (2026)
Lawn · 21 HP · Best for small farms and fuel efficiency
Power
21 HP (16 kW)
Fuel
Diesel
Transmission
Manual
PTO
18 HP @ 540 rpm
Weight
754 kg (1 t)
New price (est.)
$3,024 – $4,536
Est. used price
$907 – $2,948
Overview
Powered by a 21 HP engine, the Shibaura ST321 is a lawn and garden tractor designed for mowing, property maintenance, and light attachments. Built by Shibaura, the ST321 carries the engineering standards expected from this manufacturer. Here you will find all ST321 specs: engine displacement, fuel system, transmission gears, hydraulic flow, lift capacity, PTO speed, and tractor dimensions. Our ST321 review section below breaks down real-world strengths, trade-offs, and best use cases based on the technical specifications. Looking for the ST321 price? Our used market section estimates current resale values, and the listings panel links to live marketplace data. Scroll down for the complete Shibaura ST321 specification tables, suitability scores, price estimates, and links to similar tractors in our database.
TractorFit™ Analysis
Overall score
Based on specs and use-case fit for Shibaura ST321.
This model sits in the compact utility class with engine power suited to property maintenance and light duties. A manual gearbox offers straightforward operation and lower complexity. Best suited to residential and light commercial mowing and landscaping. PTO horsepower and speed options support mowers, hay tools, and other driven implements. Key specs include 21 HP, 18 HP PTO, 1 t operating weight, estimated used range $907–$2,948, and overall suitability 56/100.
Higher = simpler
Pros
- ✓Efficient consumption relative to power-to-weight and engine type.
- ✓Simple maintenance; mechanical transmission with lower repair costs.
- ✓High versatility: PTO and hydraulic options for multiple implements.
- ✓Strong value for money relative to power and features.
- ✓Reliable manual transmission with low maintenance cost.
Cons
- •Limited power for large-scale work or heavy equipment.
- •Limited capacity for intensive loader work.
- •Modest power-to-weight ratio; less agility in traction and on slopes.
- •Basic hydraulic system; limited for demanding implements.
Shibaura ST321 receives an overall suitability score of 56/100 from the TractorSuitability™ Engine. Ideal for small to mid-size farms (roughly 5–40 ha), light fieldwork, mowing, and properties where maneuverability matters, mixed use with multiple PTO and hydraulic implements, operations where fuel economy is a priority, tight spaces and transport on smaller trailers. The suitability sub-scores allow an objective comparison of performance across farm sizes and use types. With 21 HP and around 1 tons weight, it fits small and mid-size farms where maneuverability and running costs matter. Loader work rates 11/100; fuel efficiency index is 71/100. Maintenance is classified as Low: Mechanical transmission and straightforward engine design; lower repair costs and easier DIY or general dealer servicing. Operating cost tier is Low: Good fuel efficiency, strong value tier, and low maintenance complexity keep operating costs down. Versatility (71/100) reflects PTO and hydraulic options; cost tier (100/100) reflects value for money. It stands out in: value. It has relative limitations in: large farm, loader. Overall, it offers a balanced profile for its class. The TractorSuitability™ Engine uses manufacturer technical data only to compute these indices in an objective, reproducible way. We recommend comparing these scores with your specific acreage, crop type, and implement needs before deciding.
Real-world performance & ownership
Highlights
- Compact engine output suits mowing and light loader use.
- Manual transmission keeps design simple and ownership costs lower.
- Operating weight around 1 t aids maneuverability and transport.
- Rated PTO output of 18 HP supports mowers, hay tools, and other driven implements.
- Suitability profile is solid across typical use cases.
- Fuel efficiency scores well for its power class.
- Versatility index supports a wide range of tasks and attachments.
- Estimated used price range: $907–$2,948 USD.
Trade-offs
- Suitability scoring suggests above-average maintenance demands; consider repair history and local support.
- Loader suitability scores modestly; check front axle capacity and loader compatibility for heavy material work.
Best for
- Residential mowing
- Small property upkeep
- Light towing
- Fuel-conscious operation
- Mixed tasks and attachment use
Not ideal for
- Heavy, continuous loader work
- Low-maintenance-first buyers
- Large-acreage row-crop or heavy tillage
Shibaura ST321 — Pros and Cons
Pros
- Compact engine output suits mowing and light loader use.
- Manual transmission keeps design simple and ownership costs lower.
- Operating weight around 1 t aids maneuverability and transport.
- Rated PTO output of 18 HP supports mowers, hay tools, and other driven implements.
- Suitability profile is solid across typical use cases.
- Fuel efficiency scores well for its power class.
- Versatility index supports a wide range of tasks and attachments.
- Estimated used price range: $907–$2,948 USD.
Cons
- Suitability scoring suggests above-average maintenance demands; consider repair history and local support.
- Loader suitability scores modestly; check front axle capacity and loader compatibility for heavy material work.
Used market insights
Estimated used price
$907 – $2,948 USD
High confidence
Estimate only. Actual prices vary by condition, hours, and region.
Buyer checklist
- Verify mower deck or attachment compatibility and condition.
- Check for oil leaks and transmission operation; HST repairs are costly.
- Confirm tire condition and that the machine fits your storage and access.
For used Shibaura ST321, check hours and blade deck condition. Verify PTO and transmission operation, and that attachments match.
Find Used Listings (International)
Find Shibaura Dealers Near You
Authorized dealerships selling and servicing Shibaura tractors.
Shibaura ST321 Videos
Community Discussions
Technical Specifications
What this means: Smaller engines favor residential use; check oil capacity and service intervals for your usage.
Engine
- Maximum Power (Gross)
- 21 HP (16 kW)
- Fuel Type
- Diesel
- Cooling
- Liquid
Compare with similar models
Better Alternatives
Frequently asked questions
What is the weight of the Shibaura ST321?
Operating weight is approximately 754 kg (1 tons).
Where can I find used Shibaura ST321 listings?
This page links to international marketplaces where you can search for used Shibaura ST321 tractors; listings are provided by third parties.
How much does a used Shibaura ST321 cost?
Used Shibaura ST321 tractors are often listed in the range of $907–$2,948 USD (high confidence). Actual prices depend on hours, condition, and region.
Does the Shibaura ST321 have a PTO?
Yes. The Shibaura ST321 has a rear PTO rated at 18 HP at 540 rpm.
What is the horsepower of the Shibaura ST321?
The Shibaura ST321 is rated at 21 HP (gross) (16 kW).
Is the Shibaura ST321 good for loader work?
TractorFit scores rate this model as less suited for loader work (11/100). Check front axle capacity and loader compatibility for your intended use.
What is the Shibaura ST321 best used for?
As a lawn tractor, the Shibaura ST321 is best for mowing, light loader work, and property maintenance.
What type of transmission does the Shibaura ST321 have?
The Shibaura ST321 uses a manual transmission.
Shibaura ST321: Complete Tractor Specifications and Technical Data
Overview
The Shibaura ST321 is a lawn tractor from Shibaura designed for landscaping and property maintenance. This comprehensive tractor specifications guide provides complete technical data, engine specifications, transmission details, dimensions, and hydraulic system capabilities. This lawn tractor features a 21 HP diesel engine with manual transmission, delivering reliable performance. Our tractor database provides detailed specifications and technical data for the Shibaura ST321, making it easy to compare with other models in the Shibaura lineup or across different brands.
Engine Specifications
The Shibaura ST321 is powered by a diesel engine that delivers 21 HP for property maintenance. Tractor horsepower is a critical specification that determines the machine's ability to handle various implements. The engine specifications demonstrate Shibaura's engineering expertise in creating efficient powerplants.
- Maximum Power: 21 HP (16 kW)
- Fuel Type: Diesel
- Cooling System: Liquid-cooled
Transmission Specifications
The Shibaura ST321 features a manual transmission system. Transmission type affects power delivery and operational efficiency. Different transmission types offer various advantages for different operating conditions and implement requirements.
Dimensions and Weight
Understanding tractor dimensions and weight is essential for storage, transport, and operational compatibility. The Shibaura ST321's specifications help determine if the tractor fits your operational requirements.
- Wheelbase: 1405 mm (55.3 in)
- Weight: 754 kg (1662 lbs)
Power Take-Off (PTO)
The PTO system allows the tractor to transfer engine power to driven implements. PTO specifications, including horsepower and speed ratings, are essential when selecting implements.
- PTO Speed: 540 rpm
- PTO Power: 18 HP (13 kW)
Performance and Applications
The Shibaura ST321 delivers 21 HP performance for landscaping and property maintenance tasks. Tractor performance metrics, including power output, hydraulic capabilities, and dimensions, determine the machine's suitability for various tasks. When evaluating tractor performance, consider your specific application requirements, operating conditions, and implement needs to ensure the Shibaura ST321 matches your operational demands.
Technical Data Summary
This guide provides complete technical data and detailed specifications for the Shibaura ST321. Key specifications include: 21 HP engine, manual transmission, 18 HP PTO, and 754 kg weight. These tractor specifications enable accurate comparisons with other models. Our tractor database provides comprehensive data for thousands of models, making it easy to research specifications and compare tractors.
Conclusion
The Shibaura ST321 is a versatile lawn tractor from Shibaura, designed for property maintenance. With its 21 HP diesel engine and manual transmission, weighing 1 tons, it provides efficient operation for landscaping work. This comprehensive guide offers all essential Shibaura ST321 tractor data and specifications for informed decision-making.
Conclusion
With 21 HP, the Shibaura ST321 is a solid choice for operators who need Residential mowing, Small property upkeep, Light towing. Check the price range shown above and compare with similar models to ensure it fits your budget. Use our comparison tool to stack the ST321 against other tractors in the same HP range before making a final decision.