CAT E320GC E323GC Swing Motor Assembly Swing Reducer Gearbox 536-6580 378-9517 Excavator Spare Parts

Replacement swing motor assembly and swing reducer gearbox designed for CAT E320GC and E323GC excavators. Suitable for maintenance, repair, and overhaul applications where reliable slewing performance and correct fitment are essential.

• 1.Weak swing with slipping during startup
• 2.Abnormal swing noise, including gear howling or knocking sounds
• 3.Oil leakage at the housing and flange seal
• 4.Swing assembly overheating with elevated oil temperature
• 5.Swing jerking and slow rotation
• 6.Brake failure resulting in free slewing

• 1.Verify the machine model and part number, and confirm whether the unit is new or remanufactured
• 2.Inspect the motor piston, valve plate, reducer gears, and bearings
• 3.Ensure the unit includes a complete seal kit and has passed a factory hydraulic pressure test
• 4.Confirm that the flange dimensions and pinion teeth match the original specifications
• 5.Request anti-rust treatment and protective support for export packaging