CATEngine Parts

221-7637 Travel Gearbox With Motor — Cat 3066 318C

This is a complete travel gearbox assembly, including the integrated motor, responsible for transmitting power to the drive sprockets on CAT excavators. It enables precise control of track speed and direction, crucial for maneuvering the machine on various terrains, and is built to withstand heavy-duty operational demands. A worn or failed travel gearbox can result in slow or jerky track movement, loss of power to the tracks, or complete immobility, often accompanied by grinding noises.

Travel Gearbox With Motor – Part No 221-7637 – 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 TypeTravel Gearbox with Motor
MaterialSteel and Cast Iron
ApplicationUndercarriage Drive System
Service LifeReplace as needed based on wear
CompatibilityCAT 3066, 318C, 319C
ConditionNew — OEM specification aftermarket

Failure Symptoms

The first indication of a failing travel gearbox may be a noticeable grinding noise when operating the tracks or a loss of power to one or both tracks. If ignored, the track movement may become erratic, or the machine may lose the ability to move altogether. This can lead to significant downtime and potential damage to the undercarriage components.

Installation Tip

Ensure the final drive oil is completely drained before removing the old gearbox to prevent spills and contamination. Avoid forcing the gearbox onto the drive shaft; ensure proper alignment to prevent damage to splines.

Service Note

Replace the final drive oil and filter with the correct type and viscosity when installing a new travel gearbox.