ZF 0630.502.029 RETAINING RING for WG250 | OEM Genuine Part

Overview

The ZF 0630.502.029 RETAINING RING is a critical OEM genuine component engineered specifically for the ZF WG250 series transmission. This precision-formed ring functions as a positive axial lock, securing internal gear assemblies, shafts, and bearing packs within their designated bores. Positioned within the transmission housing, it prevents lateral movement of rotating elements under high torque and vibration. The SKU 0630.502.029 is manufactured to ZF’s exacting tolerances, ensuring a snap-fit engagement that maintains structural integrity during heavy-duty industrial operations. When installed alongside the 4646101062: TRANSMISSION HOUSING, this retaining ring creates a sealed, stable environment for the planetary gear sets.

Symptoms of Failure

• Axial gear slippage and clunking noises – A worn or fatigued retaining ring allows the gear cluster to shift out of alignment, producing metallic clunking sounds during load changes. This is a common search query for “ZF WG250 transmission gear noise.”
• Internal oil leaks near the housing joint – When the ring loses its tension, the 4646301104: HOUSING can separate slightly, allowing transmission fluid to seep past the seal. Operators often search for “ZF transmission oil leak from housing.”
• Premature bearing failure – Without proper axial retention, bearings experience excessive end-play, leading to overheating and pitting. This manifests as a whining sound that escalates with speed.
• Difficulty engaging or disengaging gears – A deformed ring can obstruct the shift mechanism, causing hard shifting or gear hang-up, particularly in WG250 series units.

Technical Specifications

Compatibility

This retaining ring is primarily designed for the ZF WG250 series transmission, but it also fits the following models due to shared planetary carrier and housing dimensions: WG180, WG200, WG220, and WG240. It is a direct replacement for the OEM part in all WG-series transmissions manufactured after 2005. Always verify the housing bore diameter before installation; the 4646301300: COVER and 4646323018: CONNECTING PART must be removed to access the ring groove.

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