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The Caterpillar 931 tracked loader is a versatile machine extensively used in construction, mining, and material handling applications. Introduced in the early 1970s, the 931 series set standards for durability, power, and operational efficiency in the medium-sized track loader class.
Development and History
The first Caterpillar 931 was launched in 1973 as part of Caterpillar's expansion into dedicated track loaders featuring sealed and lubricated track systems (SALT). This model replaced earlier designs by offering improved undercarriage longevity and enhanced operator comfort. Over the years, the series evolved into variants such as the 931B and 931C with upgrades in engine performance, hydraulics, and operator environment.
Engine and Powertrain
A mining contractor using Caterpillar 931B loaders noted the significant reduction in maintenance time after transitioning to SALT undercarriages. The extended track life reduced unexpected downtime, allowing for longer continuous operation on abrasive surfaces. Operators also appreciated the loaders’ balanced power and stability when handling heavy payloads.
Maintenance and Service Recommendations
The Caterpillar 931 tracked loader is an iconic, durable medium-sized loader ideal for demanding operational environments. With improvements such as sealed and lubricated tracks and hydrostatic transmissions, this model combines efficiency with longevity. Proper maintenance and genuine parts usage are key to maximizing its service life, making it a trusted machine among operators seeking reliable productivity.
Development and History
The first Caterpillar 931 was launched in 1973 as part of Caterpillar's expansion into dedicated track loaders featuring sealed and lubricated track systems (SALT). This model replaced earlier designs by offering improved undercarriage longevity and enhanced operator comfort. Over the years, the series evolved into variants such as the 931B and 931C with upgrades in engine performance, hydraulics, and operator environment.
Engine and Powertrain
- Powered by the Caterpillar 3204 diesel engine, a water-cooled 4-cylinder unit producing approximately 62 horsepower.
- Engine displacement stands at 317.4 cubic inches, combining reliable power with moderate fuel consumption.
- Equipped with a hydrostatic transmission offering smooth power delivery and precise speed control.
- Operating weight approximately 15,200 lbs (about 6,895 kg), striking a balance between compactness and power.
- Features sealed and lubricated tracks (SALT) introduced in 1977, enhancing track life and reducing maintenance.
- Track width options typically include 14-inch single grouser pads.
- Durable rollers, idlers, and sprockets are engineered for extreme working conditions, boosting reliability and uptime.
- Track adjusters incorporate springs and seal kits designed to keep track tension optimized under demanding terrains.
- Operating speeds reach around 6.9 mph (11.1 km/h), allowing efficient movement on site.
- Bucket capacity ranges from 0.9 to 1.1 cubic yards, suitable for various loading tasks.
- Breakout forces and lift capacities provide robust material handling capabilities for medium loads.
- Ground clearance of about 1.04 feet enables maneuverability on uneven ground.
- Machine width measures approximately 5.84 feet outside of tracks, fitting many standard workspaces.
- Spacious cab designed to enhance visibility and control comfort.
- Control configurations evolved over time to improve operator efficiency and reduce fatigue.
- Maintenance access designed for ease of service on engine and undercarriage components.
- Sealed and Lubricated Track (SALT): Track chain design filled with lubricant and sealed from contaminants, extending track life.
- Hydrostatic Transmission: Power transmission system using hydraulic fluid pressure to deliver smooth, controllable speed changes.
- Breakout Force: The maximum amount of force exerted by the bucket or loader arms during digging or lifting.
- Grouser: The projections on track shoes that provide traction.
- Operating Weight: Total machine weight including fluids, attachments, and operator.
A mining contractor using Caterpillar 931B loaders noted the significant reduction in maintenance time after transitioning to SALT undercarriages. The extended track life reduced unexpected downtime, allowing for longer continuous operation on abrasive surfaces. Operators also appreciated the loaders’ balanced power and stability when handling heavy payloads.
Maintenance and Service Recommendations
- Regular inspection of track tension and condition of rollers, idlers, and sprockets essential for undercarriage longevity.
- Engine oil and filter changes as recommended by Caterpillar guidelines to maintain engine health.
- Hydraulic fluid and filter maintenance to ensure smooth for boom and bucket operation.
- Brake and control lever checks to maintain safe operation.
- Use genuine Caterpillar parts for replacement to preserve performance and warranty.
The Caterpillar 931 tracked loader is an iconic, durable medium-sized loader ideal for demanding operational environments. With improvements such as sealed and lubricated tracks and hydrostatic transmissions, this model combines efficiency with longevity. Proper maintenance and genuine parts usage are key to maximizing its service life, making it a trusted machine among operators seeking reliable productivity.
