Overview
The ZF 0630.502.183 RETAINING RING is a critical OEM genuine component engineered for axial location and secure fastening within the WG100 and WG201 transmission assemblies. This precision-formed ring sits directly within the transmission housing groove, preventing lateral movement of internal shafts and gear sets under high-torque conditions. The SKU 0630.502.183 is specifically designed to withstand the extreme radial loads and thermal cycling found in heavy-duty industrial transmissions. When installed alongside a TRANSMISSION HOUSING (4644101160) or a TRANSMISSION HOUSING (4644301323), this retaining ring ensures that all rotating elements maintain their precise axial clearances, directly contributing to overall drivetrain longevity.
Symptoms of Failure
When the ZF 0630.502.183 retaining ring wears or fatigues, operators will notice distinct operational issues. Oil seepage around the transmission housing joint is a primary indicator, as a compromised ring allows internal pressure to escape past the seal. Intermittent gear slipping under load occurs when the ring no longer holds the shaft in its correct position, causing misalignment of the gear teeth. Unusual metallic rattling or clicking noises from the transmission bell housing often signal that the ring has lost its spring tension, allowing components to shift axially. Finally, difficulty engaging or disengaging gears can develop when the retaining ring fails to maintain proper spacing between the clutch pack and the THREADED BUSH (4644301189).
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 0630.502.183 |
| Material | Spring Steel (DIN 17222 / SAE 1074) |
| Inner Diameter | 63.5 mm (nominal) |
| Outer Diameter | 72.0 mm (nominal) |
| Thickness | 2.5 mm |
| Weight | 0.018 kg |
| Surface Finish | Phosphate coated / Oil dipped |
| OEM Reference | ZF 0630.502.183 |
| Operating Temperature Range | -40°C to +150°C |
Compatibility
This OEM genuine retaining ring is engineered for direct fitment in the following ZF transmission model series: WG 100 Series (including WG101, WG102, WG103, WG104) and WG 201 Series (including WG201, WG202, WG203). It is also commonly used in the WG180 and WG200 variants where the same shaft retention geometry is employed. For proper installation, ensure the ring is seated flush against the groove in the THREADED BUSH (4644301189) and that the SCREW PLUG (4475280043) is torqued to specification to prevent any axial play.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101160 | TRANSMISSION HOUSING | Main structural casing for gear assembly |
| 4644301323 | TRANSMISSION HOUSING | Alternate housing variant for WG201 series |
| 4644301189 | THREADED BUSH | Provides threaded interface for retaining ring groove |
| 4475280043 | SCREW PLUG | Seals hydraulic passages in the housing |
| 0634306198 | O-RING | Static seal between housing and cover plate |
| 0730365067 | TYPE PLATE | Identification plate for transmission model |
| 4644301161 | COVER PLATE | Encloses the transmission housing opening |
| 0636100621 | HEXAGON SCREW | Fastener for cover plate and housing |
| 0631610020 | SET SCREW | Locks adjustment mechanisms in place |
| 0501218540 | BREATHER | Equalizes internal pressure and vents moisture |
