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Legacy of the International 175C
The International Harvester 175C track loader, introduced in the early 1970s, was a continuation of IH’s commitment to building robust, versatile earthmoving equipment. As part of the 175 series, the 175C featured significant upgrades over its predecessors, including improved hydraulics, a more powerful engine, and enhanced operator ergonomics. By 1974, the 175C had become a staple in construction, land clearing, and industrial site preparation across North America.
Following the merger of International Harvester’s construction division into Dresser Industries in the 1980s, many parts and manuals were rebranded under the Dresser name. However, the core mechanical systems remained consistent, making cross-referencing between IH and Dresser documentation a viable strategy for owners and restorers.
Core Specifications and Engine Options
The 175C was typically powered by the DT-466 diesel engine, a turbocharged inline-six known for its torque and reliability. Key specifications include:
Manuals and Documentation Challenges
Finding accurate operating and maintenance manuals for the 175C can be difficult due to the age of the machine and the transition from IH to Dresser. Manuals were published in multiple editions, often with minor revisions. Some key types include:
Maintenance and Operating Tips
To keep a 175C running reliably:
Fuel Efficiency and Field Use
The DT-466 engine is known for its fuel efficiency relative to its power output. In forestry applications, the 175C can clear brush and push logs with minimal strain. In urban demolition, its compact frame and strong lift capacity make it ideal for basement excavation and debris loading.
A contractor in Alabama noted that his post-1978 175C averaged 5 gallons per hour during heavy grading, with fuel costs offset by reduced downtime and minimal electronic failures.
Recommendations for Owners and Restorers
The International 175C remains a respected and capable track loader decades after its release. With proper documentation, maintenance, and community support, these machines continue to serve in grading, clearing, and excavation roles across North America. Whether restoring a 1974 model or operating a late-series Dresser variant, understanding the machine’s history and systems is key to unlocking its full potential.
The International Harvester 175C track loader, introduced in the early 1970s, was a continuation of IH’s commitment to building robust, versatile earthmoving equipment. As part of the 175 series, the 175C featured significant upgrades over its predecessors, including improved hydraulics, a more powerful engine, and enhanced operator ergonomics. By 1974, the 175C had become a staple in construction, land clearing, and industrial site preparation across North America.
Following the merger of International Harvester’s construction division into Dresser Industries in the 1980s, many parts and manuals were rebranded under the Dresser name. However, the core mechanical systems remained consistent, making cross-referencing between IH and Dresser documentation a viable strategy for owners and restorers.
Core Specifications and Engine Options
The 175C was typically powered by the DT-466 diesel engine, a turbocharged inline-six known for its torque and reliability. Key specifications include:
- Operating weight: ~35,000 lbs (15,875 kg)
- Engine output: ~150 hp
- Transmission: Powershift with torque converter
- Bucket capacity: ~2.5–3.0 cubic yards
- Track type: Double grouser steel pads
Manuals and Documentation Challenges
Finding accurate operating and maintenance manuals for the 175C can be difficult due to the age of the machine and the transition from IH to Dresser. Manuals were published in multiple editions, often with minor revisions. Some key types include:
- Operator’s Manual: Covers daily checks, controls, and basic operation
- Service Manual: Includes hydraulic schematics, engine teardown procedures, and troubleshooting guides
- Parts Catalog: Exploded diagrams and part numbers for ordering replacements
Maintenance and Operating Tips
To keep a 175C running reliably:
- Change engine oil every 100 hours using SAE 30 or 15W-40 depending on climate
- Inspect hydraulic filters and fluid every 250 hours
- Grease all pivot points weekly, especially bucket pins and track rollers
- Monitor transmission fluid for discoloration or metal particles
- Check track tension monthly and adjust to manufacturer specs
Fuel Efficiency and Field Use
The DT-466 engine is known for its fuel efficiency relative to its power output. In forestry applications, the 175C can clear brush and push logs with minimal strain. In urban demolition, its compact frame and strong lift capacity make it ideal for basement excavation and debris loading.
A contractor in Alabama noted that his post-1978 175C averaged 5 gallons per hour during heavy grading, with fuel costs offset by reduced downtime and minimal electronic failures.
Recommendations for Owners and Restorers
- Use Dresser-branded manuals when IH originals are unavailable
- Cross-reference engine specs with DT-466 service literature
- Join vintage equipment forums and owner groups for parts sourcing
- Keep a printed wiring diagram and hydraulic schematic in the cab
- Consider retrofitting LED work lights and modern seat suspension for comfort
The International 175C remains a respected and capable track loader decades after its release. With proper documentation, maintenance, and community support, these machines continue to serve in grading, clearing, and excavation roles across North America. Whether restoring a 1974 model or operating a late-series Dresser variant, understanding the machine’s history and systems is key to unlocking its full potential.
