CATUndercarriage

5I7959 Pulley-Crankshaft — Cat 320 320 l

This is a Caterpillar crankshaft pulley, a vital component in the engine's accessory drive system that transmits rotational power from the crankshaft to other components like the alternator and fan. It is engineered to precise specifications for balanced operation and durability, unlike a worn pulley which may exhibit wobble or uneven belt wear. Operators might hear unusual noises from the front of the engine, observe excessive belt vibration, or notice a lack of charging if this pulley fails.

Pulley-Crankshaft – Part No 5I7959 – CAT Spare Part
Part Specifications
BrandCAT
CategoryUndercarriage
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

Cross-reference part number with serial number before ordering to confirm fitment. Keep original parts until new ones are confirmed correct. Record part numbers replaced for future reference.

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 or forged steel
ApplicationEngine accessory drive system
Service LifeReplace if cracked, warped, or bearing fails
CompatibilityCAT 320, 320L
ConditionNew — OEM specification aftermarket

Failure Symptoms

Early signs of a failing crankshaft pulley include a high-pitched squealing noise from the front of the engine or visible wobbling of the pulley. If ignored, the drive belt can slip or break, leading to a loss of power to critical engine accessories like the water pump and alternator. The main equipment risk is engine overheating due to lack of coolant circulation or electrical system failure from a non-charging alternator.

Installation Tip

Ensure the crankshaft is securely held to prevent rotation when loosening or tightening the crankshaft pulley bolt. Do not reuse the old pulley bolt if it shows signs of stretching or damage; always use a new one.

Service Note

When replacing the crankshaft pulley, inspect the drive belt for wear and tension, and check the condition of the water pump and alternator bearings.