CATEngine Parts

2797750 Pinion Set — Cat 311C 311D LRR

This is a CAT Pinion Set, a crucial set of gears that transmit rotational force from the drive shaft to the differential, enabling the wheels to turn. Manufactured to meet high-quality standards, it provides durable and precise gear meshing compared to a worn set with damaged teeth or excessive play. Operators may experience whining noises from the drive axle, clunking during gear changes, or difficulty steering if this component is failing.

Pinion Set – Part No 2797750 – 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 TypePinion Gear Set
MaterialHardened forged steel
ApplicationDrive axle differential
Service LifeReplace as needed based on inspection
CompatibilityCTP aftermarket replacement
ConditionNew — CTP aftermarket replacement

Failure Symptoms

The initial symptom of a failing pinion set is typically an audible whining or humming noise from the drive axle that increases with vehicle speed. If left unaddressed, this noise can worsen, and the gears may begin to skip or grind, leading to difficulty in acceleration or deceleration. Continued operation risks severe damage to the differential and potential loss of drive.

Installation Tip

Proper gear backlash and pre-load are critical for the longevity of a new pinion set; ensure these are set correctly during installation. Avoid reusing old shims or bearings, as they may not be compatible with the new gear set's specifications.

Service Note

When replacing the pinion set, inspect the ring gear, differential bearings, and axle seals for any signs of wear or damage.