ZF 0730.063.428 RING | OEM Genuine Part

Overview

The ZF 0730.063.428 RING is a precision-engineered OEM genuine component designed for internal sealing and load distribution within heavy-duty ZF powershift transmissions. This ring sits between the clutch pack assembly and the housing bore, ensuring hydraulic pressure is maintained for proper gear engagement. The SKU 0730.063.428 is a critical wear item in construction machinery transmissions, preventing cross-contamination between hydraulic circuits. When installed alongside the 4143101009 HOUSING and 4143301025 HOUSING, this ring forms a sealed chamber that directs oil flow to the rotating clutch drums.

Symptoms of Failure

• Erratic clutch engagement or gear slipping under load – A worn ring allows hydraulic pressure to bleed past the piston, causing delayed or incomplete clutch pack compression.
• Transmission oil leaks from the bell housing area – When the ring loses its interference fit, oil escapes past the housing joint, often mistaken for a main seal failure.
• Overheating transmission fluid – Internal leakage generates excessive heat due to constant hydraulic slippage, triggering thermal alarms on construction equipment.
• Hard shifting or neutral creep – Reduced sealing integrity causes partial clutch pack engagement when the transmission is in neutral, common in WG-series units.

Technical Specifications

Compatibility

This ring is engineered for ZF WG-series powershift transmissions commonly used in construction machinery. It directly fits the following models: WG180, WG200, WG210, and WG250. It also applies to certain Ecomat 4HP and 6HP series where the clutch piston seal ring shares this cross-section. For proper installation, always replace the 0634313603 O-RING and 4475280018 SCREW PLUG simultaneously to prevent secondary failures from debris ingress.

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