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CAT 955L Track Loader Overview
The Caterpillar 955L is a mid-size track loader introduced in the 1970s, designed for excavation, loading, and grading in rugged terrain. Powered by the CAT 3304 diesel engine, it delivers approximately 125 horsepower and features a torque converter drive, hydraulic loader arms, and a robust undercarriage. The 955L was widely adopted in construction, mining, and agriculture, with thousands of units sold globally. Its mechanical simplicity and durable frame make it a favorite among operators maintaining older fleets.
Caterpillar Inc., founded in 1925, has long supported legacy machines like the 955L through its dealer network and aftermarket parts. The engine in the 955L is known for tolerating a range of oil viscosities, but choosing the right grade is essential for longevity and performance.
Oil Viscosity and Climate Considerations
Operators often ask whether 20W-50 oil is appropriate for the CAT 955L, especially in regions with hot summers and mild winters. While 20W-50 offers high-temperature protection, it may be too thick for cold starts, particularly in climates where temperatures drop near freezing.
Recommended oil grades include:
Some operators worry that lower-viscosity oils like 15W-40 may pass through worn piston rings and increase oil consumption. While this is theoretically possible in engines with excessive wear, modern multi-grade oils are engineered to maintain film strength and reduce volatility.
In Athens, Greece, where summer temperatures exceed 35°C and winter rarely drops below freezing, 15W-40 is considered optimal. It provides sufficient protection during hot operation while remaining fluid enough for cold starts.
Field Anecdote and Practical Insight
A civil engineer in Greece reported using 15W-40 in his CAT 955L for over a decade without increased oil consumption or startup issues. He emphasized regular oil changes and monitoring for blow-by as key practices. In Venezuela, an operator preferred 20W-50 due to consistently high ambient temperatures and heavy-duty cycles, noting that cold starts were never a concern.
In Missouri, a retired mechanic recalled that straight 30W was the standard in the 1970s, but modern oils offer better protection and flexibility. He advised against using 20W-50 in machines that operate in variable climates or sit idle during winter.
Recommendations for Technicians and Owners
While 20W-50 oil may work in consistently hot environments, 15W-40 remains the most versatile and widely recommended choice for the CAT 955L. It supports cold starts, maintains viscosity under load, and aligns with modern diesel engine requirements. With proper maintenance and oil selection, the 955L can continue operating reliably for decades.
The Caterpillar 955L is a mid-size track loader introduced in the 1970s, designed for excavation, loading, and grading in rugged terrain. Powered by the CAT 3304 diesel engine, it delivers approximately 125 horsepower and features a torque converter drive, hydraulic loader arms, and a robust undercarriage. The 955L was widely adopted in construction, mining, and agriculture, with thousands of units sold globally. Its mechanical simplicity and durable frame make it a favorite among operators maintaining older fleets.
Caterpillar Inc., founded in 1925, has long supported legacy machines like the 955L through its dealer network and aftermarket parts. The engine in the 955L is known for tolerating a range of oil viscosities, but choosing the right grade is essential for longevity and performance.
Oil Viscosity and Climate Considerations
Operators often ask whether 20W-50 oil is appropriate for the CAT 955L, especially in regions with hot summers and mild winters. While 20W-50 offers high-temperature protection, it may be too thick for cold starts, particularly in climates where temperatures drop near freezing.
Recommended oil grades include:
- 15W-40: A widely used multi-grade diesel engine oil that balances cold-start performance with high-temperature protection. Suitable for most climates and commonly used in heavy equipment.
- 10W-30: Offers better cold-start flow and is ideal for machines operating in cooler regions or during winter months.
- 30W (Straight Weight): Historically used in older CAT engines, but less common today due to limited cold-start protection.
- Multi-Grade Oil: Engine oil formulated to perform across a range of temperatures, indicated by two numbers (e.g., 15W-40).
- W (Winter): Refers to the oil’s viscosity at cold temperatures, not weight.
- Viscosity Index: A measure of how much an oil’s thickness changes with temperature.
Some operators worry that lower-viscosity oils like 15W-40 may pass through worn piston rings and increase oil consumption. While this is theoretically possible in engines with excessive wear, modern multi-grade oils are engineered to maintain film strength and reduce volatility.
In Athens, Greece, where summer temperatures exceed 35°C and winter rarely drops below freezing, 15W-40 is considered optimal. It provides sufficient protection during hot operation while remaining fluid enough for cold starts.
Field Anecdote and Practical Insight
A civil engineer in Greece reported using 15W-40 in his CAT 955L for over a decade without increased oil consumption or startup issues. He emphasized regular oil changes and monitoring for blow-by as key practices. In Venezuela, an operator preferred 20W-50 due to consistently high ambient temperatures and heavy-duty cycles, noting that cold starts were never a concern.
In Missouri, a retired mechanic recalled that straight 30W was the standard in the 1970s, but modern oils offer better protection and flexibility. He advised against using 20W-50 in machines that operate in variable climates or sit idle during winter.
Recommendations for Technicians and Owners
- Use 15W-40 for Mixed Climates: Balances protection and flow across seasons.
- Avoid 20W-50 Unless in Constant Heat: Too thick for cold starts and may strain the starter.
- Monitor Oil Consumption and Blow-By: Indicates ring wear or valve guide issues.
- Change Oil Every 250–300 Hours: Prevents sludge and maintains engine health.
- Use API CH-4 or Higher Spec Oils: Ensures compatibility with diesel engines and additive packages.
While 20W-50 oil may work in consistently hot environments, 15W-40 remains the most versatile and widely recommended choice for the CAT 955L. It supports cold starts, maintains viscosity under load, and aligns with modern diesel engine requirements. With proper maintenance and oil selection, the 955L can continue operating reliably for decades.
