ZF 4699.305.078 RETAINING RING | OEM Genuine Part

Overview

The ZF 4699.305.078 RETAINING RING is a critical axial locking component engineered for heavy-duty construction machinery transmissions. This OEM genuine part, identified by SKU 4699.305.078, secures gear assemblies and bearing packs against lateral displacement within the transmission housing. It sits directly on the output shaft or intermediate shaft, preventing axial movement of adjacent components such as the 4699100080 BASIC GEARBOX assembly. By maintaining precise axial clearances, this retaining ring ensures that the 0634309122 SHAFT SEAL and 0634801038 SEALING RING remain correctly positioned, preventing lubricant migration and internal contamination.

Symptoms of Failure

• Transmission oil leaks at shaft exits: When the retaining ring fatigues or dislodges, the 0634309122 SHAFT SEAL loses its axial support, allowing transmission fluid to escape past the seal lip.
• Gear slippage under load: A worn or broken retaining ring permits axial gear float, causing incomplete engagement of clutch packs and intermittent power loss during operation.
• Abnormal bearing noise or vibration: Loss of axial constraint allows the 0750117782 TAPERED ROLLER BEARING to shift, generating metallic grinding sounds and increased driveline vibration.
• Difficulty engaging gears: Misalignment of the 4699100080 BASIC GEARBOX due to ring failure results in hard shifting or incomplete gear engagement.

Technical Specifications

Compatibility

This retaining ring is designed for use in ZF WG-series powershift transmissions commonly found in construction machinery. Compatible models include WG180, WG200, WG210, and WG240 series. It also fits select ZF 4WG-200 and 6WG-200 variants. The ring works in conjunction with the 0630000091 SHIM RING to establish precise end-play tolerances. For optimal assembly, always pair this retaining ring with a new 0634801038 SEALING RING to prevent internal leakage paths.

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