CATEngine Parts

368-2783 Swing Drive Piston Motor — Cat M318 M320

This is a swing drive piston motor, a hydraulic component that provides the rotational force for the upper structure of an excavator to swing. It converts hydraulic pressure into mechanical torque, enabling precise and powerful slewing movements. Operators may notice slow or jerky swing operation, inability to swing in one or both directions, or excessive noise from the swing mechanism if this motor is failing.

Swing Drive Piston Motor – Part No 368-2783 – 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 TypeSwing Drive Piston Motor
MaterialHardened steel and aluminum alloy
ApplicationExcavator swing circuit
Service LifeReplace as needed based on inspection
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

The first indication of a failing swing drive piston motor might be a noticeable decrease in swing speed or responsiveness. If ignored, the swing function can become progressively weaker, leading to jerky movements and difficulty holding position on inclines. The ultimate consequence of a severely compromised motor is the inability to swing the upper structure, significantly impacting the machine's operational capability.

Installation Tip

Ensure the hydraulic system is properly bled of air after installing the new swing drive motor to prevent cavitation and ensure smooth operation. Do not mix hydraulic fluids from different manufacturers, as this can cause seal degradation.

Service Note

When replacing the swing drive piston motor, inspect the swing gear, swing bearing, and hydraulic fluid for contamination or wear.