ZF 0634.306.508 O-RING for WG100/WG130/WG131 | OEM Genuine Part

Overview

The ZF 0634.306.508 O-RING is a precision-engineered sealing component designed for the WG100, WG130, and WG131 transmission series. This OEM genuine part, identified by SKU 0634.306.508, sits within the hydraulic control circuit and differential housing interface, preventing pressurized transmission fluid from migrating between mating surfaces. When installed correctly, this O-ring maintains the critical seal integrity required for consistent clutch pack engagement and torque converter lockup. In a typical rebuild, this seal is replaced alongside the 5838109021: DIFFERENTIAL assembly to ensure no cross-contamination of fluid circuits occurs during operation.

Symptoms of Failure

• External transmission fluid seepage around the differential housing or valve body interface, often noticed as a slow drip after parking.
• Erratic gear engagement or delayed shifting caused by loss of hydraulic pressure in the clutch apply circuits.
• Whining or groaning noises from the transmission during acceleration, indicating air ingestion into the hydraulic system.
• Burning smell or overheating due to insufficient lubrication reaching the 0750117075: TAPER ROLLER BEARING and other rotating assemblies.

Technical Specifications

Compatibility

This O-ring is specifically engineered for ZF WG series powershift transmissions, including the WG100, WG130, and WG131 models. It is also compatible with the WG180 and WG200 series when used in the differential housing seal groove. For proper installation, always verify the seal groove condition and replace the 2095209019: DIFFERENTIAL unit if scoring or wear is present. The 0631329086: SPRING PIN should also be inspected during service to ensure the housing alignment remains secure.

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