ZF 0730.063.426 RING | OEM Genuine Part

Overview

The ZF 0730.063.426 RING is an OEM genuine sealing component engineered for high-stress planetary gear sets and clutch drum assemblies within ZF construction machinery transmissions. This precision-machined ring, identified by SKU 0730.063.426, sits between the rotating shaft and the stationary 4143101009 HOUSING to maintain hydraulic pressure and prevent fluid bypass. It is a critical wear item that ensures consistent lubrication and clutch engagement in heavy-duty off-highway equipment. When paired with the 4143301025 HOUSING, this ring creates a positive seal that isolates different oil circuits within the valve body.

Symptoms of Failure

• Erratic clutch engagement or gear slipping – When the 0730.063.426 ring loses its dimensional integrity, internal hydraulic pressure drops, causing delayed or incomplete clutch pack application. This is a common search query for “ZF transmission slipping under load.”
• External oil seepage at housing joints – A worn ring allows transmission fluid to escape past the 0634313603 O-RING interface, leading to visible drips around the bell housing. Technicians often search for “ZF WG200 oil leak between housings.”
• Overheating transmission fluid – Loss of seal integrity reduces oil flow to coolers, causing thermal degradation. This symptom is frequently paired with “construction transmission running hot” queries.
• Metallic debris in oil pan – As the ring wears, it can shed material that contaminates the hydraulic circuit, often detected during routine oil changes.

Technical Specifications

Compatibility

This ring is a direct fit for ZF WG180, WG200, and WG210 series powershift transmissions commonly used in wheel loaders, graders, and excavators. It also applies to select ZF Ecomat 4HP and 5HP models where the 4475280018 SCREW PLUG secures the housing assembly. For proper installation, always replace the adjacent 0634313591 O-RING and inspect the 4143298457 SEAL KIT for additional wear components.

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