Swing Motor Assembly 116-3550 116-3549 107-7054 for E320B E330B Excavator

This hydraulic swing motor assembly is the core rotating drive component of an excavator, compatible with the E320B and E330B models. It delivers torque for upper-structure rotation and integrates the hydraulic motor with the reduction gear unit. Precision machining ensures stable rotating output and reliable sealing performance, making it well suited for equipment overhaul and replacement.

• Swing is slow or rotation torque is weak
• Swing jitter and abnormal noise during rotation
• Oil leakage from the motor sealing surface and joints
• 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