Overview
The ZF 0730.501.555 RETAINING RING is a critical axial locking component engineered specifically for the WG200 and WG92 series transmissions. This OEM genuine part secures internal assemblies—such as gear clusters and bearing packs—within the main shaft housing, preventing axial displacement under high torque loads. The SKU 0730.501.555 is precision-formed to maintain consistent clamping force, ensuring that adjacent components like the 4660198001: PERIPHERALS remain correctly positioned during operation. Without this ring, the entire gear train can shift, leading to catastrophic internal contact.
Symptoms of Failure
- Intermittent gear slipping under load: A worn or fatigued retaining ring allows axial play, causing the gear set to momentarily disengage during acceleration.
- Metallic grinding noise from the transmission housing: When the ring loses tension, internal components contact the 4660101011: TRANSMISSION HOUSING, producing a distinct scraping sound.
- Unexplained oil leaks near the output shaft: Axial movement can distort seal surfaces, forcing lubricant past the 0501209818: RANGE SELECTOR interface.
- Hard shifting or range engagement failure: A broken ring allows the shift fork to drift, preventing the 4660301018: HOUSING from locking into gear.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number (SKU) | 0730.501.555 |
| Material | Spring steel (C67S) with phosphate coating |
| Inner Diameter | 85.0 mm |
| Outer Diameter | 98.5 mm |
| Thickness | 2.5 mm |
| Weight | 0.018 kg |
| OEM Reference | ZF 0730.501.555 |
| Operating Temperature Range | -40°C to +150°C |
Compatibility
This retaining ring is a direct fit for the following ZF transmission series: WG180, WG200, WG92, WG94, and WG98. It is commonly used in the planetary gear section of the WG200 and WG92 models, where it retains the sun gear assembly. For WG94 and WG98 variants, the ring also secures the intermediate shaft bearing. Always verify the groove width in your specific 4660101011: TRANSMISSION HOUSING before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4660198001 | PERIPHERALS | Manages hydraulic flow to clutch packs |
| 0501209818 | RANGE SELECTOR | Controls gear range engagement |
| 4660101011 | TRANSMISSION HOUSING | Main structural casing for gear sets |
| 4660301018 | HOUSING | Encloses the output shaft assembly |
| 0631306174 | CYLINDRICAL PIN | Aligns and locks shift forks |
| 0769123894 | TYPE PLATE | Identifies transmission model and specs |
| 4660221012 | SUCTION TUBE | Draws oil from the sump to the pump |
| 0634100317 | O-RING | Seals fluid passages between housings |
| 0636103273 | CAP SCREW | Secures the valve body to the housing |
| 0750100022 | SCREW PLUG | Closes oil drain and test ports |
