International Harvester IH-175B Overview

[MikePhua]

Introduction
The International Harvester IH-175B is a mid-sized excavator that became notable for its versatility and durability in construction and agricultural projects. Produced during the late 1960s and early 1970s, this model represents a period when International Harvester was expanding its heavy machinery lineup to compete globally. The IH-175B was designed to handle moderate excavation, grading, and lifting tasks efficiently, making it a popular choice for contractors seeking reliable performance at a reasonable cost.
Development and Company Background
International Harvester, founded in 1902, initially focused on agricultural machinery before expanding into construction equipment. The IH-175B was developed as part of International Harvester’s mid-range excavator series, aimed at bridging the gap between smaller compact models and larger industrial units. By the time the IH-175B entered the market, International Harvester had already established a reputation for producing durable engines, robust hydraulics, and user-friendly controls. The company emphasized long-term serviceability and ease of maintenance, factors that contributed to the machine’s longevity and widespread adoption.
Technical Specifications

• Operating weight: approximately 17,500 kg (38,600 lbs)
  
• Engine: diesel, 6-cylinder, delivering around 105–120 horsepower
  
• Maximum digging depth: 4.8 meters (15.7 feet)
  
• Bucket capacity: 0.65–0.85 cubic meters (0.85–1.1 cubic yards)
  
• Hydraulic system: open-center, with auxiliary circuit options for attachments
  
• Swing radius: full 360-degree rotation capability
  
• Travel speed: up to 4.5 km/h (2.8 mph)
  

The IH-175B also featured reinforced undercarriage tracks, allowing it to operate on uneven and moderately soft terrain. The cab was designed to provide reasonable operator comfort for the era, with straightforward controls that minimized the learning curve for new operators.
Operational Features and Advantages
The IH-175B excelled in general-purpose excavation, trenching, and material handling. Its mid-sized frame allowed access to tighter job sites where larger machines could not maneuver efficiently. Operators appreciated the hydraulic responsiveness and predictable digging performance, which reduced operator fatigue during long workdays. The machine’s reliability was enhanced by the robust International Harvester diesel engine, which could run long hours without major service.
Maintenance and Common Solutions
Owners of the IH-175B frequently note the importance of routine hydraulic checks, track tension adjustments, and engine oil monitoring. Common maintenance practices include:

• Inspecting hydraulic lines for leaks or wear
  
• Greasing all pivot points at regular intervals to prevent premature wear
  
• Checking undercarriage track alignment and adjusting as needed
  
• Monitoring cooling system to avoid overheating during heavy workloads
  

With proper maintenance, many IH-175B units remain operational even decades after their original production, a testament to the design’s durability.
Sales and Market Presence
While exact production numbers are limited, it is estimated that several thousand IH-175B units were produced globally, with significant sales in North America and Europe. The model was often favored by small to mid-sized contractors who required a reliable mid-range excavator without the expense of larger industrial models. Over time, the IH-175B has become a collector’s item for vintage construction machinery enthusiasts, valued for its classic design and historical significance.
Conclusion
The International Harvester IH-175B remains a benchmark in mid-sized excavator design, combining rugged construction, practical hydraulics, and operator-friendly features. Its legacy highlights International Harvester’s commitment to durability, serviceability, and performance during a pivotal era in heavy machinery development. For modern collectors or operators maintaining older equipment, the IH-175B offers both historical value and functional reliability, making it a noteworthy piece of construction history.
References and Notes

• Mid-range excavator specifications are based on manufacturer data and historical brochures.
  
• Operational and maintenance guidance reflects typical practices for diesel-powered excavators of this era.