International Harvester 645 Specs, Price and Review (2026)
Agricultural · 66 HP · Best for small farms and versatility
Power
66 HP (49 kW)
Fuel
Diesel
Transmission
Manual
PTO
56 HP @ 540 rpm
Weight
3,701 kg (4 t)
New price (est.)
$38,016 – $57,024
Est. used price
$13,306 – $39,917
Overview
As a agricultural tractor with 66 HP of power, the International Harvester 645 is built for mid-size farm fieldwork, loader use, and hay operations. As a International Harvester tractor, the 645 continues the brand's reputation for reliability and field performance. Below are the full 645 specs: engine specifications, transmission details, PTO ratings, hydraulic system data, and dimensions — everything you need for a buying decision. The 645 review data on this page is generated from specifications, helping you understand how it compares to similar tractors in its class. We include 645 price estimates — both new and used — to help you understand the cost of ownership and compare it against alternatives. Use the comparison tool below to set the International Harvester 645 against similar models, or browse the alternatives section for other tractors in this HP range.
TractorFitâ„¢ Analysis
Overall score
Based on specs and use-case fit for International Harvester 645.
With its specs, the mainstream farm segment for fieldwork, feeding, and material handling. Manual transmission keeps ownership costs down and is well understood for maintenance. Farm-oriented design prioritizes drawbar and PTO work, hydraulics, and durability. PTO specs determine compatibility with mowers, balers, and other powered attachments. Key specs include 66 HP, 56 HP PTO, 4 t operating weight, estimated used range $13,306–$39,917, and overall suitability 55/100.
Higher = simpler
Pros
- ✓Well suited to small and mid-size farms for power and maneuverability.
- ✓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.
International Harvester 645 receives an overall suitability score of 55/100 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. The suitability sub-scores allow an objective comparison of performance across farm sizes and use types. With 66 HP and around 4 tons weight, it fits small and mid-size farms where maneuverability and running costs matter. Loader work rates 29/100; fuel efficiency index is 65/100. 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 Moderate: Reasonable fuel efficiency and maintenance; operating costs are in line with the power class. Versatility (71/100) reflects PTO and hydraulic options; cost tier (74/100) reflects value for money. It stands out in: small farm. 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
- HP band suits full-season fieldwork and feeding.
- Manual transmission keeps design simple and ownership costs lower.
- 4 t operating weight fits a broad range of implements and conditions.
- Rated PTO output of 56 HP supports mowers, hay tools, and other driven implements.
- Suitability profile is solid across typical use cases.
- Versatility index supports a wide range of tasks and attachments.
- Estimated used price range: $13,306–$39,917 USD.
- Farm orientation targets fieldwork, PTO work, and reliability.
Trade-offs
- Maintenance complexity is rated on the higher side; factor in service access and parts availability.
- Loader and front attachment suitability is limited by design; best for lighter loader duties.
Best for
- Row-crop and hay operations
- Feeding and material handling
- Full-season fieldwork
- Mixed tasks and attachment use
Not ideal for
- Heavy, continuous loader work
- Low-maintenance-first buyers
International Harvester 645 — Pros and Cons
Pros
- HP band suits full-season fieldwork and feeding.
- Manual transmission keeps design simple and ownership costs lower.
- 4 t operating weight fits a broad range of implements and conditions.
- Rated PTO output of 56 HP supports mowers, hay tools, and other driven implements.
- Suitability profile is solid across typical use cases.
- Versatility index supports a wide range of tasks and attachments.
- Estimated used price range: $13,306–$39,917 USD.
- Farm orientation targets fieldwork, PTO work, and reliability.
Cons
- Maintenance complexity is rated on the higher side; factor in service access and parts availability.
- Loader and front attachment suitability is limited by design; best for lighter loader duties.
Used market insights
Estimated used price
$13,306 – $39,917 USD
High confidence
Estimate only. Actual prices vary by condition, hours, and region.
Buyer checklist
- Check engine and PTO hours; service history matters for long-term reliability.
- Confirm PTO speed (540/1000) and HP match your mowers, balers, or other implements.
- Inspect hydraulics and three-point hitch condition; repair costs can be high.
For used International Harvester 645, hours and service history matter. Confirm PTO and hydraulic operation, tire condition, and that implements match your HP and category.
Find Used Listings (International)
Technical Specifications
What this means: Cylinder count and displacement affect smoothness and repair complexity; compare to similar models in the same HP band.
Engine
- Maximum Power (Gross)
- 66 HP (49 kW)
- Fuel Type
- Diesel
- Cooling
- Liquid
Compare with similar models
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Frequently asked questions
How much does a used International Harvester 645 cost?
Used International Harvester 645 tractors are often listed in the range of $13,306–$39,917 USD (high confidence). Actual prices depend on hours, condition, and region.
Does the International Harvester 645 have a PTO?
Yes. The International Harvester 645 has a rear PTO rated at 56 HP at 540 rpm.
What is the horsepower of the International Harvester 645?
The International Harvester 645 is rated at 66 HP (gross) (49 kW).
Is the International Harvester 645 good for loader work?
TractorFit scores rate this model as less suited for loader work (29/100). Check front axle capacity and loader compatibility for your intended use.
What is the International Harvester 645 best used for?
As a farm tractor, the International Harvester 645 is suited to fieldwork, PTO-driven implements, hay work, and general estate or small-farm tasks.
What type of transmission does the International Harvester 645 have?
The International Harvester 645 uses a manual transmission.
What should I check when buying a used International Harvester 645?
Verify hours, condition, service history, PTO operation, hydraulics, and tire wear. Confirm weight and dimensions if you need to transport or match implements.
International Harvester 645: Complete Tractor Specifications and Technical Data
Overview
The International Harvester 645 is a agricultural tractor from International Harvester designed for agricultural operations. This comprehensive tractor specifications guide provides complete technical data, engine specifications, transmission details, dimensions, and hydraulic system capabilities. This agricultural tractor features a 66 HP diesel engine with manual transmission, delivering reliable performance. Our tractor database provides detailed specifications and technical data for the International Harvester 645, making it easy to compare with other models in the International Harvester lineup or across different brands.
Engine Specifications
The International Harvester 645 is powered by a diesel engine that delivers 66 HP for agricultural tasks. Tractor horsepower is a critical specification that determines the machine's ability to handle various implements. The engine specifications demonstrate International Harvester's engineering expertise in creating efficient powerplants.
- Maximum Power: 66 HP (49 kW)
- Fuel Type: Diesel
- Cooling System: Liquid-cooled
Transmission Specifications
The International Harvester 645 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 International Harvester 645's specifications help determine if the tractor fits your operational requirements.
- Weight: 3701 kg (8159 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: 56 HP (42 kW)
Performance and Applications
The International Harvester 645 delivers 66 HP performance for agricultural applications including plowing, planting, and harvesting. 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 International Harvester 645 matches your operational demands.
Technical Data Summary
This guide provides complete technical data and detailed specifications for the International Harvester 645. Key specifications include: 66 HP engine, manual transmission, 56 HP PTO, and 3701 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 International Harvester 645 is a reliable agricultural tractor from International Harvester, designed for modern farming operations. With its 66 HP diesel engine and manual transmission, weighing 4 tons, it provides dependable performance for agricultural tasks. This comprehensive guide offers all essential International Harvester 645 tractor data and specifications for informed decision-making.
Conclusion
With 66 HP, the International Harvester 645 is a solid choice for operators who need Row-crop and hay operations, Feeding and material handling, Full-season fieldwork. Check the price range shown above and compare with similar models to ensure it fits your budget. Use our comparison tool to stack the 645 against other tractors in the same HP range before making a final decision.