E336D E345D E349D 1994539 Excavator Machinery Parts Final Drive Swing Base Assembly

E336D E345D E349D Excavator Final Drive Swing Reduction Gearbox Parts (Without Motor) Rotary base

Core Structure

• Sun gear: Connected to the slewing motor via splines to receive high-speed power input.
• Planet gear: 3 to 4 units per stage; rotates around the sun gear while spinning on its own axis to transmit torque.
• Ring gear: Fixed to the reducer housing and keeps meshed with planet gears.
• Planet carrier: Acts as the power output end and drives the lower drive pinion.
• Brake: Integrated wet multi-disc brake; spring-on braking and hydraulic pressure release to avoid unintended slewing drift.
• Housing & bearing: Adopts high-strength cast or forged steel housing, fitted with heavy-duty bearings, featuring reliable dustproof and oil-sealing performance.

Working Principle

Common Faults & Causes

• Abnormal noise and jitter: Gear wear and pitting, bearing failure, lubrication shortage or oil contamination, improper meshing clearance.
• Oil leakage: Aged oil seals, housing cracks, overfilled lubricant, blocked breather valve.
• Sluggish and weak slewing: Worn gears or bearings, brake drag failure, motor internal leakage, improper speed ratio matching.
• Overheating: Low oil level or oil degradation, overload operation, persistent brake dragging, poor heat dissipation condition.
• Gear jumping and tooth breakage: Severe impact load, foreign substance intrusion, material fatigue wear, assembly misalignment.

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