CATEngine Parts

1B8721 Woodruff Key — Cat 320C 320D

This is a Woodruff key, a semicircular metal key used to connect a rotating shaft to a component, preventing relative rotation and transmitting torque. It ensures positive drive between components like pulleys, gears, or sprockets and their corresponding shafts, maintaining precise timing and power transfer. A missing or sheared key will result in the component spinning freely on the shaft, leading to a loss of power transmission and potential damage to surrounding components.

Woodruff Key – Part No 1B8721 – CAT Spare Part
Part Specifications
BrandCAT
CategoryEngine 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

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.

Part TypeWoodruff Key
MaterialSteel
ApplicationShaft and component connection
Service LifeReplace as needed if damaged or sheared
CompatibilityOEM specification
ConditionNew — Aftermarket replacement

Failure Symptoms

The first indication of a sheared or missing Woodruff key is often a sudden loss of power transmission to the component it connects, such as a pulley or gear. If the component spins freely on the shaft, the machine will likely cease to function correctly in that system. The consequence is a complete breakdown of operation for the affected subsystem, potentially leading to further damage if the spinning component contacts other parts.

Installation Tip

Ensure the keyway on both the shaft and the component are perfectly clean and free of any burrs or debris before attempting installation. Do not hammer the key in forcefully; it should slide into place with moderate pressure.

Service Note

Inspect the shaft and the component's keyway for any signs of wear or damage, and check the integrity of the bearing supporting the shaft when replacing a Woodruff key.