YC85-6 Excavator Machinery Parts Planetary Drive Excavator Swing Gearbox

Excavator Machinery Gearbox Hydraulic Excavator Parts YC85 - 6 Swing Gearbox Planetary Drive

Core Structure

• Sun gear: Connects slewing motor through splines for high-speed power input.
• Planet gear: 3–4 pieces per stage; rotates around sun gear meanwhile spinning itself to transmit torque.
• Ring gear: Fixed to reducer casing and meshes with planet gears.
• Planet carrier: Delivers output power and drives the bottom drive pinion.
• Brake: Integrated wet multi-disc brake; spring braking, hydraulic release to prevent idle slewing.
• Housing & Bearing: High-strength cast/forged steel casing, heavy-load bearings, good dustproof and anti-leakage performance.

Working Principle

Common Faults & Causes

• Noise & stuttering: Gear wear/pitting, bearing damage, lack of oil/oil contamination, abnormal meshing gap.
• Oil leakage: Oil seal aging, casing cracks, over oil level, breather valve clogging.
• Weak & slow slewing: Gear/bearing wear, brake release failure, motor internal leakage, unmatched speed ratio.
• Overheating: Insufficient oil/oil aging, overload, brake drag, poor heat dissipation.
• Gear jumping & broken teeth: Impact load, foreign substance ingress, fatigue wear, mounting misalignment.

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