Swing Motor Assembly 119-5406 for E312B 311B 315B 317B Excavator

This hydraulic swing motor assembly is the core rotating drive component of the excavator, compatible with the E312B, 311B, 315B, and 317B models. It delivers torque for upper structure rotation and integrates the hydraulic motor with the reduction gear into a single unit. Manufactured with precision machining, it offers stable rotating output and reliable sealing performance, making it well suited for equipment overhaul and replacement. Part number: 119-5406.

The following symptoms may indicate that the swing motor assembly requires inspection or replacement:

• Swing slow or weak rotation torque
• Swing jitter and abnormal noise during rotation
• Oil leakage from the motor sealing surface and joint
• Unable to swing or swing brake failure
• Swing drift after stopping

• Confirm the machine model before ordering
• Check the part number against your old swing assembly
• Keep hydraulic oil clean during installation
• Replace the seal kit together if needed