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The 955L’s Place in Track Loader History
The Caterpillar 955L track loader, introduced in the mid-1970s, was part of Caterpillar’s evolution from cable-operated machines to fully hydraulic systems. Built in Peoria, Illinois, the 955L replaced the earlier 955K and featured a more powerful 3306 diesel engine, improved hydrostatic steering, and a refined operator station. With an operating weight of around 32,000 pounds and a bucket capacity of 2.5 cubic yards, the 955L was designed for versatility in construction, demolition, and material handling.
Caterpillar’s dominance in the track loader market during the 1970s and 1980s was unmatched. The 955L sold in the thousands across North America, Europe, and Australia, often praised for its reliability and ease of maintenance. However, like many machines of its era, age-related wear and mechanical quirks have become common topics among owners and mechanics.
Understanding Steering Pedal Mechanics
The 955L uses a pedal-actuated clutch and brake system for steering. Each pedal controls the clutch and brake on its respective side—left or right. When pressed, the pedal disengages the clutch and applies the brake, allowing the machine to pivot. Upon release, springs and linkages return the pedal to its resting position, re-engaging the clutch.
Key components involved in pedal return include:
Common Symptoms and Root Causes
A frequent issue reported by operators is a left steering pedal that fails to return fully after a hard press. This can leave the left clutch partially disengaged, causing drag, reduced power to the left track, and increased fuel consumption. The machine may still turn properly, but the lingering disengagement can lead to premature clutch wear.
Typical causes include:
Field Remedies and Preventive Measures
Operators and mechanics have developed several field-tested solutions to address pedal return issues:
A retired operator from North Carolina recalled a 955L used in hurricane debris cleanup that developed a sticky left pedal after weeks of wet operation. Rather than disassembling the linkage, the crew used a mix of diesel and transmission fluid to flush the pivot points. Within minutes, the pedal began returning normally. While not a permanent fix, it bought them time until a full teardown was possible.
Another story from a demolition site in Texas involved a 955L that had no grease fittings on the pedal assembly. The mechanic fabricated a grease port using a drill and tap kit, allowing regular lubrication and eliminating the issue entirely.
Design Limitations and Modern Comparisons
Unlike modern hydrostatic loaders, the 955L relies on mechanical linkages and clutch packs, which are more prone to wear and require manual adjustment. Newer machines like the Cat 963K use joystick steering and electronically controlled transmissions, reducing operator fatigue and improving responsiveness.
However, the 955L remains popular among small contractors and restoration enthusiasts due to its simplicity and robust build. Its mechanical systems, while dated, are serviceable with basic tools and field knowledge—making it a favorite in regions with limited dealer access.
Recommendations for Long-Term Reliability
To maintain optimal steering performance on a 955L:
Conclusion
The Caterpillar 955L’s steering pedal system, while mechanically straightforward, demands attention as the machine ages. Uneven pedal return is often a symptom of deeper wear or neglect—but with proper care, the issue can be resolved without major overhaul. For operators who value tactile control and mechanical feedback, the 955L remains a testament to Caterpillar’s durable design philosophy.
The Caterpillar 955L track loader, introduced in the mid-1970s, was part of Caterpillar’s evolution from cable-operated machines to fully hydraulic systems. Built in Peoria, Illinois, the 955L replaced the earlier 955K and featured a more powerful 3306 diesel engine, improved hydrostatic steering, and a refined operator station. With an operating weight of around 32,000 pounds and a bucket capacity of 2.5 cubic yards, the 955L was designed for versatility in construction, demolition, and material handling.
Caterpillar’s dominance in the track loader market during the 1970s and 1980s was unmatched. The 955L sold in the thousands across North America, Europe, and Australia, often praised for its reliability and ease of maintenance. However, like many machines of its era, age-related wear and mechanical quirks have become common topics among owners and mechanics.
Understanding Steering Pedal Mechanics
The 955L uses a pedal-actuated clutch and brake system for steering. Each pedal controls the clutch and brake on its respective side—left or right. When pressed, the pedal disengages the clutch and applies the brake, allowing the machine to pivot. Upon release, springs and linkages return the pedal to its resting position, re-engaging the clutch.
Key components involved in pedal return include:
- Pivot bushings and shafts
- Return springs
- Linkage rods and clevis joints
- Brake adjustment rods
- Floor plate clearance
Common Symptoms and Root Causes
A frequent issue reported by operators is a left steering pedal that fails to return fully after a hard press. This can leave the left clutch partially disengaged, causing drag, reduced power to the left track, and increased fuel consumption. The machine may still turn properly, but the lingering disengagement can lead to premature clutch wear.
Typical causes include:
- Corroded pivot points lacking lubrication
- Debris buildup under the floor plate
- Weak or stretched return springs
- Worn brake rod bushings
- Misadjusted clutch linkage
Field Remedies and Preventive Measures
Operators and mechanics have developed several field-tested solutions to address pedal return issues:
- Lubrication Sweep
Remove the floor plate and apply penetrating oil (e.g., WD-40 or diesel fuel mix) to every joint from the pedal pivot to the brake rod. This often frees up seized bushings and restores smooth movement.
- Heat Treatment
Carefully heating the pedal pivot point with a torch until cherry red can break up internal rust. This method should be used cautiously, with a water hose nearby to prevent fire hazards.
- Spring Replacement and Adjustment
Inspect and replace return springs if they appear stretched or fatigued. Ensure the adjustment rod connecting to the brake is not elongated or loose, which can affect pedal geometry.
- Linkage Realignment
Check for misaligned or bent linkage rods. Even a slight deviation can cause binding. Re-bending or replacing rods can restore proper pedal travel.
- Routine Cleaning
Periodically remove the floor plate and clean out accumulated dirt, rust flakes, and oil sludge. This simple step can prevent long-term binding and wear.
A retired operator from North Carolina recalled a 955L used in hurricane debris cleanup that developed a sticky left pedal after weeks of wet operation. Rather than disassembling the linkage, the crew used a mix of diesel and transmission fluid to flush the pivot points. Within minutes, the pedal began returning normally. While not a permanent fix, it bought them time until a full teardown was possible.
Another story from a demolition site in Texas involved a 955L that had no grease fittings on the pedal assembly. The mechanic fabricated a grease port using a drill and tap kit, allowing regular lubrication and eliminating the issue entirely.
Design Limitations and Modern Comparisons
Unlike modern hydrostatic loaders, the 955L relies on mechanical linkages and clutch packs, which are more prone to wear and require manual adjustment. Newer machines like the Cat 963K use joystick steering and electronically controlled transmissions, reducing operator fatigue and improving responsiveness.
However, the 955L remains popular among small contractors and restoration enthusiasts due to its simplicity and robust build. Its mechanical systems, while dated, are serviceable with basic tools and field knowledge—making it a favorite in regions with limited dealer access.
Recommendations for Long-Term Reliability
To maintain optimal steering performance on a 955L:
- Lubricate all pedal and linkage joints every 100 hours
- Inspect return springs quarterly and replace as needed
- Keep the floor plate area clean and dry
- Adjust clutch linkages annually or after any major repair
- Consider retrofitting grease fittings if none exist
Conclusion
The Caterpillar 955L’s steering pedal system, while mechanically straightforward, demands attention as the machine ages. Uneven pedal return is often a symptom of deeper wear or neglect—but with proper care, the issue can be resolved without major overhaul. For operators who value tactile control and mechanical feedback, the 955L remains a testament to Caterpillar’s durable design philosophy.
