Cat 289D Coolant Type Discussion

[MikePhua]

A user recently asked on the forum about the coolant type for the Cat 289D track skid steer loader. They are considering replacing the coolant and wanted to confirm which type would ensure optimal performance and long-term stability for the machine. Different coolant types have various chemical compositions, and choosing the correct one is crucial for preventing engine overheating and corrosion.
Recommended Coolant Types

1. Official CAT Recommended Coolant
   For the Cat 289D, the recommended coolant is the CAT-branded coolant. This coolant is designed to ensure efficient operation of the engine and cooling system under high temperatures, while also protecting the system from corrosion. CAT coolant typically has a longer service life and superior anti-freeze properties.
   
2. Universal Coolant
   If CAT-branded coolant is unavailable, users can opt for a universal ethylene glycol-based coolant. This type of coolant is typically compatible with most brands of machinery, but it should meet the specifications required for the Cat 289D. It is advisable to choose a coolant with anti-corrosion and anti-rust properties, especially for areas with cold climates, as freeze protection is vital.
   

Coolant Replacement Recommendations

1. Regularly Check Coolant Condition
   Even when using the recommended coolant, it's essential to regularly check its condition. The coolant should remain clean, free of sediment or oil contamination. If the coolant turns discolored or shows signs of contaminants, it should be replaced.
   
2. Ensure Proper Mixing Ratio
   Most coolants require mixing with water in the correct ratio. Typically, a 50% coolant and 50% deionized water mix is recommended. This ratio helps ensure the coolant performs well under both freezing and high-temperature conditions.
   
3. Inspect the Cooling System
   When replacing the coolant, it's important to inspect the cooling system for leaks, particularly around the water pump, radiator, and connecting hoses. Regularly check for cracks or wear in the system’s hoses and connections to prevent coolant leaks.
   

Conclusion
For the Cat 289D track skid steer loader, using the CAT-recommended coolant is the best option to ensure long-term, stable operation of the engine cooling system. If CAT-branded coolant is not available, an ethylene glycol-based universal coolant may be used, as long as it has anti-corrosion properties and meets the machine's specifications. During coolant replacement, always inspect the coolant’s condition and the cooling system for leaks, and maintain the proper mix ratio to ensure the cooling system functions effectively in various working conditions.