ZF 0634.306.504 O-RING for WG100/WG130/WG131 | OEM Genuine Part

Overview

The ZF 0634.306.504 O-RING is a precision-engineered sealing component designed for the WG100, WG130, and WG131 transmission series. This OEM genuine part, identified by SKU 0634.306.504, sits at critical fluid interfaces within the transmission housing, preventing pressurized oil from escaping between mating surfaces. It ensures a leak-proof seal between the HOUSING and the HOUSING assembly, maintaining hydraulic integrity for consistent clutch pack engagement and torque converter operation.

Symptoms of Failure

• External oil seepage at housing joints: When the O-ring hardens or cracks, transmission fluid will pool around the mating surfaces of the BEARING COVER and main case.
• Low hydraulic pressure causing delayed shifts: A compromised seal allows internal bypass, leading to soft or slipping gear engagements during acceleration.
• Contaminated fluid from external debris ingress: A failed O-ring permits dirt and moisture to enter the transmission, accelerating wear on internal components like the SCREW PLUG threads.
• Audible whining from the pump circuit: Air ingestion through a degraded O-ring creates cavitation noise, often mistaken for pump failure.

Technical Specifications

Compatibility

This O-ring is specifically engineered for ZF WG-series transmissions, including the WG100, WG130, and WG131 models. It also fits select variants of the WG180 and WG200 series where the same housing interface is used. Always verify the groove dimensions in your HOUSING before installation. For complete seal replacement, pair this O-ring with a new GASKET and SHAFT SEAL.

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