ZF 0730.501.813 RETAINING RING for WG94 | OEM Genuine Part

Overview

The ZF 0730.501.813 RETAINING RING is a critical axial locking component engineered specifically for the WG 94 series transmission assembly. This OEM genuine part secures internal gear sets and bearing packs within the planetary gear train, preventing lateral displacement under high-torque loads. The SKU 0730.501.813 corresponds to a precision-machined snap ring that fits into a dedicated groove on the output shaft or housing bore. When installed correctly, it maintains the exact clearance required for smooth gear engagement. This retaining ring works in conjunction with the 4661101037: TRANSMISSION HOUSING and the 4661301099: HOUSING II to create a sealed, rigid environment for rotating components.

Symptoms of Failure

• Intermittent gear slipping under load: A worn or fatigued retaining ring allows axial play, causing clutch packs to lose engagement pressure during acceleration.
• Metallic rattling from the transmission bell housing: Loose ring fragments or a deformed ring produce a distinct chatter during idle or coasting, often misdiagnosed as bearing noise.
• Unexplained oil contamination with metal shavings: As the ring fractures, hardened steel particles circulate through the fluid, accelerating wear on the 0631306174: CYLINDRICAL PIN and valve body components.
• Hard shifting or delayed engagement: Axial migration of the ring alters the preload on the sun gear shaft, leading to erratic shift timing and harsh clutch application.

Technical Specifications

Compatibility

This retaining ring is designed for the ZF WG 94 series transmissions, including models WG94, WG120, WG150, WG180, and WG200. It is also used in certain WG 80 variants where the output shaft diameter matches the 72.5 mm inner diameter specification. Always verify the groove depth in your specific housing before installation. The ring interfaces directly with the 0769123894: TYPE PLATE mounting area on the rear housing cover.

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