ZF 0730.063.388 RING | OEM Genuine Part

Overview

The ZF 0730.063.388 RING is an OEM genuine sealing component engineered for high-stress planetary transmissions in construction machinery. Positioned as a critical static seal within the clutch drum assembly, this ring prevents hydraulic fluid bypass between rotating and stationary elements. The SKU 0730.063.388 corresponds to a precision-machined steel ring with a specialized wear-resistant coating, ensuring consistent pressure retention during heavy-load operations. It interfaces directly with the 4143101009 HOUSING and the 4143301025 HOUSING to maintain proper oil gallery isolation.

Symptoms of Failure

• Hydraulic pressure drop during gear engagement: A worn 0730.063.388 ring allows cross-port leakage, causing sluggish clutch pack application and delayed response in loader or dozer transmissions.
• External oil seepage at housing joint: Degraded ring material leads to visible fluid weeping around the 0634313603 O-RING interface, often mistaken for gasket failure.
• Intermittent gear slip under load: When the ring loses its dimensional integrity, the transmission exhibits random slipping in forward or reverse ranges, particularly during grade climbing.
• Contaminated transmission fluid: Fractured ring fragments circulate through the hydraulic system, accelerating wear on valves and the 4475280018 SCREW PLUG sealing surfaces.

Technical Specifications

Compatibility

This ring is designed for ZF WG-series powershift transmissions commonly found in wheel loaders, graders, and excavators. Confirmed compatible models include:

• ZF WG180
• ZF WG200
• ZF WG210
• ZF WG310
• ZF 4WG-200
• ZF 6WG-310

Always verify the part number against your transmission’s clutch housing assembly diagram. The ring seats between the 4143101009 HOUSING and the 4143301025 HOUSING, requiring simultaneous replacement of the 0634313603 O-RING and 4475280018 SCREW PLUG during rebuilds.

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