10-10-2025, 01:39 PM
Summary
The Terex 72-31 wheel loader, a robust machine from the golden era of American heavy equipment, remains a reliable workhorse for operators who understand its hydraulic and steering systems. Locating service manuals and understanding fluid reservoirs are key to keeping these vintage loaders operational.
Terex Company Background and Loader Lineage
Terex Corporation, founded in 1933 as a division of General Motors, evolved through acquisitions and innovations to become a global manufacturer of construction and mining equipment. The 72-series wheel loaders were introduced during the 1970s and 1980s, designed for rugged earthmoving tasks in quarries, logging yards, and municipal operations. The 72-31 model, part of this lineage, featured a mid-range frame size, articulated steering, and a high-capacity bucket suited for general-purpose loading.
By the late 1980s, Terex loaders like the 72-31 had gained a reputation for durability and simplicity. Though production numbers are hard to verify, estimates suggest several thousand units were sold across North America, with many still in service today.
Key Terminology and System Overview
On the Terex 72-31, the steering pump reservoir is commonly found behind the operator’s cab, near the articulation joint. To check the fluid level:
Manual Acquisition and Community Solutions
Operators seeking service manuals often turn to online marketplaces, where PDF versions covering multiple models (72-21 through 72-51) are sold. Prices range from $70 to $130 USD depending on completeness and format. Manuals typically include:
Anecdotes and Field Wisdom
One Canadian operator recalled buying a 72-31B and discovering the steering reservoir only after tracing hydraulic lines from the pump. Another shared that his older 72-20 had a tank mounted directly behind the cab, suggesting design continuity across models.
In Manitoba, two owners coordinated manual sharing after discovering they lived within 50 kilometers of each other. Their collaboration helped identify grease points and resolve a steering lag issue caused by low fluid and a clogged filter.
Maintenance Tips and Recommendations
To keep a Terex 72-31 in peak condition:
The Terex 72-31 remains a testament to American engineering—simple, powerful, and built to last. With proper maintenance and community support, these loaders continue to serve in gravel pits, farms, and municipal yards. Understanding the location of key components like the steering reservoir and investing in a comprehensive service manual are essential steps for any owner committed to keeping this classic machine alive.
The Terex 72-31 wheel loader, a robust machine from the golden era of American heavy equipment, remains a reliable workhorse for operators who understand its hydraulic and steering systems. Locating service manuals and understanding fluid reservoirs are key to keeping these vintage loaders operational.
Terex Company Background and Loader Lineage
Terex Corporation, founded in 1933 as a division of General Motors, evolved through acquisitions and innovations to become a global manufacturer of construction and mining equipment. The 72-series wheel loaders were introduced during the 1970s and 1980s, designed for rugged earthmoving tasks in quarries, logging yards, and municipal operations. The 72-31 model, part of this lineage, featured a mid-range frame size, articulated steering, and a high-capacity bucket suited for general-purpose loading.
By the late 1980s, Terex loaders like the 72-31 had gained a reputation for durability and simplicity. Though production numbers are hard to verify, estimates suggest several thousand units were sold across North America, with many still in service today.
Key Terminology and System Overview
- Steering Pump Reservoir: A dedicated tank that supplies hydraulic fluid to the steering system. Its location varies by model but is often mounted behind the cab or integrated into the main hydraulic tank.
- Hydraulic Fluid Level Check: Typically performed via a sight glass, dipstick, or fill cap inspection. Fluid should be checked with the loader parked on level ground and the engine off.
- Service Manual: A technical document detailing maintenance procedures, fluid capacities, torque specs, and system diagrams. Often sold in PDF format or as reprints from third-party vendors.
On the Terex 72-31, the steering pump reservoir is commonly found behind the operator’s cab, near the articulation joint. To check the fluid level:
- Ensure the loader is parked safely with the engine off.
- Locate the fill cap or sight glass on the reservoir.
- Use a clean dipstick if available, or visually inspect the fluid level.
- Top off with manufacturer-recommended hydraulic oil, typically ISO 46 or equivalent.
Manual Acquisition and Community Solutions
Operators seeking service manuals often turn to online marketplaces, where PDF versions covering multiple models (72-21 through 72-51) are sold. Prices range from $70 to $130 USD depending on completeness and format. Manuals typically include:
- Grease point maps
- Hydraulic schematics
- Electrical diagrams
- Maintenance intervals
Anecdotes and Field Wisdom
One Canadian operator recalled buying a 72-31B and discovering the steering reservoir only after tracing hydraulic lines from the pump. Another shared that his older 72-20 had a tank mounted directly behind the cab, suggesting design continuity across models.
In Manitoba, two owners coordinated manual sharing after discovering they lived within 50 kilometers of each other. Their collaboration helped identify grease points and resolve a steering lag issue caused by low fluid and a clogged filter.
Maintenance Tips and Recommendations
To keep a Terex 72-31 in peak condition:
- Inspect hydraulic filters monthly and replace every 500 hours.
- Grease all pivot points weekly, especially the articulation joint and bucket linkage.
- Monitor tire pressure and wear, as uneven inflation affects steering response.
- Check steering cylinder seals for leaks or play.
- Flush hydraulic fluid annually to remove contaminants and moisture.
The Terex 72-31 remains a testament to American engineering—simple, powerful, and built to last. With proper maintenance and community support, these loaders continue to serve in gravel pits, farms, and municipal yards. Understanding the location of key components like the steering reservoir and investing in a comprehensive service manual are essential steps for any owner committed to keeping this classic machine alive.
