CATElectrical Parts

7W3773 Pulley-Crankshaft — Cat 120H 120H es

This crankshaft pulley is a critical component of the engine's accessory drive system, responsible for transmitting rotational power to components like the alternator, water pump, and air conditioning compressor. It is manufactured to meet stringent OEM material and dimensional standards, ensuring a precise fit and optimal performance compared to a worn or damaged pulley that may exhibit cracks or imbalance. Operator symptoms of a failing pulley include unusual noises from the front of the engine, such as squealing or rattling, and potential intermittent operation of driven accessories.

Pulley-Crankshaft – Part No 7W3773 – CAT Spare Part
Part Specifications
BrandCAT
CategoryElectrical Parts
ConditionAftermarket — OEM Specification
DispatchSame-day from Mumbai (before 3 PM IST)
GST InvoiceAvailable — all orders
Export DocsCommercial invoice, packing list, COO

Compatible Models

Always verify with serial number before ordering.

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Installation & Application Notes

Disconnect main battery before working on electrical components. Use dielectric grease on all connector pins. Check ground connections — most electrical faults trace to poor grounds. Test with multimeter before installing new parts.

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

Part TypeCrankshaft Pulley
MaterialCast Iron
ApplicationEngine Accessory Drive
Service LifeReplace every 4,000 hrs or as needed
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

The first sign of a failing crankshaft pulley is often an audible squealing or rattling noise originating from the front of the engine. If left unaddressed, the pulley may develop excessive wobble, leading to belt slippage and reduced performance of driven accessories. Continued operation with a damaged pulley risks further damage to the crankshaft snout and accessory components.

Installation Tip

Ensure the crankshaft snout is clean and free of debris before installation, as any foreign material can cause improper seating and premature failure. Do not use excessive force or impact tools to install the pulley, as this can damage the crankshaft or the pulley itself.

Service Note

Inspect the condition of the accessory drive belt and tensioner for wear or proper function when replacing the crankshaft pulley.