Overview
The ZF 0630.502.053 RETAINING RING is a precision-engineered circlip designed to secure internal components within the WG200 series transmission. This OEM genuine part functions as a critical axial lock, preventing shaft-mounted gears, bearings, and clutch packs from shifting position under high torque loads. Located inside the main gear housing, the retaining ring fits into a machined groove on the output shaft or planetary carrier assembly. The SKU 0630.502.053 is manufactured to ZF’s exacting tolerances, ensuring a tight interference fit that maintains proper gear mesh alignment. Without this ring, the entire rotating assembly can drift, leading to catastrophic internal damage.
Symptoms of Failure
- Intermittent gear slipping under load: A worn or fatigued retaining ring allows the planetary gear set to shift axially, causing temporary loss of torque transfer during acceleration.
- Metallic grinding noise from the transmission housing: When the ring loses its spring tension, internal components contact the HOUSING, producing a distinct scraping sound during gear changes.
- Sudden loss of drive in forward gears: Complete ring fracture permits the output shaft to slide out of position, disengaging the clutch pack from the PLANET CARRIER.
- Contaminated transmission fluid with metallic particles: As the ring wears against the BEARING COVER, steel debris circulates through the hydraulic system, clogging valve bodies.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 0630.502.053 |
| Material | Spring steel (DIN 17222 C67S) |
| Inner Diameter | 52.0 mm |
| Outer Diameter | 62.0 mm |
| Thickness | 2.5 mm |
| Weight | 12 grams |
| Surface Finish | Phosphate coated |
| OEM Reference | ZF 0630.502.053 |
| Groove Depth | 1.8 mm |
Compatibility
This retaining ring is specifically engineered for the ZF WG200 series transmissions, including models WG180, WG200, and WG210. It also fits select variants of the Ecomat 4HP and 5HP series where the output shaft diameter matches 52 mm. Always verify the groove width in your HOUSING before installation. The ring works in conjunction with the SCREW PLUG that seals the access port for inspection. For complete rebuilds, pair this part with a new SHAFT SEAL and GASKET to prevent fluid leaks.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4108101112 | HOUSING | Main transmission casing that contains the retaining ring groove |
| 4108201177 | HOUSING | Intermediate housing section for WG200 series |
| 0636302056 | SCREW PLUG | Seals the retaining ring access port |
| 4108301304 | BEARING COVER | Protects the bearing adjacent to the retaining ring |
| 4108306173 | GASKET | Seals the bearing cover interface |
| 0750110040 | SHAFT SEAL | Prevents fluid leakage past the output shaft |
| 4108102042 | INPUT | Input shaft assembly that transfers torque to the planetary set |
| 4108302099 | PLANET CARRIER | Holds planetary gears retained by this ring |
| 4108302007 | BEARINGSHEET | Thrust bearing shim set for axial clearance adjustment |
| 0635332196 | BALL BEARING | Supports the output shaft adjacent to the retaining ring |
