CATEngine Parts

378-9517 Swing Drive — Cat

This swing drive is a self-contained unit responsible for providing the rotational power to the upper structure of an excavator, allowing it to slew or turn. It consists of a hydraulic motor, a reduction gear train, and a mounting flange, engineered to meet robust OEM performance standards for durability and torque output. A worn or failing swing drive may exhibit slow or jerky swing movements, grinding noises, or an inability to hold the upper structure in position. Operators will notice a significant reduction in productivity and potentially unsafe operating conditions due to uncontrolled movement.

Swing Drive – Part No 378-9517 – 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 (Slew Drive)
MaterialSteel gears, cast iron housing, hydraulic motor components
ApplicationExcavator upper structure slew
Service LifeReplace as needed based on inspection and performance
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

The initial symptom of a failing swing drive is often a noticeable increase in the time it takes for the upper structure to swing, or jerky, inconsistent rotation. If ignored, the swing action may become progressively slower and noisier, potentially leading to the inability to hold the load, causing the upper structure to drift. Continued operation risks uncontrolled movement of the upper structure, posing a significant safety hazard and potential damage to the machine or surroundings.

Installation Tip

Ensure the swing bearing surfaces are thoroughly cleaned and lubricated according to the manufacturer's specifications before mounting the new drive. Do not operate the swing function immediately after installation; allow time for the hydraulic fluid to circulate and prime the motor.

Service Note

When replacing the swing drive, it is essential to inspect the swing bearing for wear, proper lubrication, and any signs of damage.