CATEngine Parts

355-1791 Expansion Valve — Cat C18

Name: 355-1791 Expansion Valve — Cat C18
Brand: CAT
SKU: 355-1791
Availability: InStock

This expansion valve is a critical component within the engine's cooling system, regulating refrigerant flow to maintain optimal operating temperatures. It is manufactured to meet stringent OEM quality standards, ensuring superior performance and durability compared to worn or damaged valves that can cause temperature fluctuations. Operators may notice erratic temperature gauge readings, engine overheating, or a lack of cabin heating/cooling when this valve begins to fail.

Expansion Valve – Part No 355-1791 – CAT Spare Part

Part Specifications

Brand	CAT
Category	Engine Parts
Condition	Aftermarket — OEM Specification
Dispatch	Same-day from Mumbai (before 3 PM IST)
GST Invoice	Available — all orders
Export Docs	Commercial invoice, packing list, COO

Compatible Models

CAT Engine C7 1 C18 Loader 950M 962M Tractor D6R2 D8T Compactor 815K

Always verify with serial number before ordering.

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Parts Trading Company · Mumbai, Est. 1956 · Same-day dispatch · Ships worldwide · GST invoice included

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Installation & Application Notes

Inspect mating surfaces for wear before fitting. Use torque specs from service manual. Replace gaskets and seals as a set — reusing compressed gaskets causes oil leaks. Clean all oil passages with compressed air.

Always consult the OEM service manual for model-specific torque values and procedures. WhatsApp our technical team if you need fitment guidance.

Failure Symptoms

Erratic temperature gauge readings are often the first sign of a failing expansion valve. If ignored, the engine may begin to consistently run too hot or too cold, impacting performance and fuel efficiency. Continued operation with a faulty valve can lead to significant engine component damage due to improper temperature regulation.

Installation Tip

Ensure the cooling system is completely drained and flushed before installation to remove any contaminants that could damage the new valve. Avoid overtightening the valve fittings, as this can strip the threads or crack the valve body.

Service Note

Inspect the radiator, thermostat, and water pump for proper operation when replacing the expansion valve.

Part Type	Expansion Valve
Material	Brass, Steel
Application	Engine Cooling System
Service Life	Replace every 4,000 hrs or 3 years
Compatibility	CAT specification
Condition	New — OEM specification aftermarket

355-1791 Expansion Valve — Cat C18

Compatible Models

Related CAT Parts

Ship This Part To Your Location

Installation & Application Notes

Failure Symptoms