Overview
The ZF 0630.502.073 RETAINING RING is a precision-engineered OEM genuine component designed to secure axial positioning within the planetary gear sets and clutch assemblies of heavy-duty ZF transmissions. This snap ring fits into a machined groove on shafts or housings, preventing lateral movement of gears, bearings, and thrust washers under extreme torque loads. The SKU 0630.502.073 is critical for maintaining proper gear mesh and load distribution in construction machinery transmissions. When installed alongside the 4143101022 HOUSING and the 4143301044 HOUSING, this retaining ring ensures that internal components remain locked in place during high-vibration operation.
Symptoms of Failure
- Transmission gear slipping under load: A worn or broken retaining ring allows axial play, causing gears to disengage partially during operation, especially in construction equipment climbing grades.
- Metallic rattling noise from transmission housing: When the 0630.502.073 loses tension, loose components strike the 0631329135 SPRING PIN or housing walls, producing distinct metallic sounds at idle or low RPM.
- Oil contamination with metal shavings: A fractured retaining ring sheds debris into the hydraulic circuit, often visible during oil changes as fine metallic particles in the filter.
- Erratic clutch engagement: Axial movement caused by ring failure misaligns clutch packs, leading to delayed or harsh shifting in ZF WG-series transmissions.
Technical Specifications
| Part Number | 0630.502.073 |
| Type | Internal Snap Ring (Retaining Ring) |
| Material | Spring Steel (SAE 1070-1095) |
| Surface Treatment | Phosphate Coating / Black Oxide |
| Nominal Diameter | Ø 82.5 mm (internal) |
| Cross-Section | 3.5 mm x 3.5 mm |
| Weight | 0.025 kg |
| OEM Reference | ZF 0630.502.073 |
| Operating Temperature Range | -40°C to +150°C |
Compatibility
This retaining ring is engineered for ZF heavy-duty powershift transmissions commonly used in construction machinery, including the WG180, WG200, and WG210 series. It also fits select models of the ZF 4WG-200 and 6WG-200 transmissions. The 0630.502.073 is typically installed in the output shaft assembly or planetary carrier section. For proper sealing, pair this ring with the 0636302014 SCREW PLUG and the 0634801057 SEALING RING to prevent fluid bypass around the retaining groove.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4143101022 | HOUSING | Transmission main casing |
| 4143301044 | HOUSING | Clutch housing assembly |
| 0631329135 | SPRING PIN | Alignment dowel for housing |
| 0636302014 | SCREW PLUG | Oil gallery sealing plug |
| 0634801057 | SEALING RING | O-ring for plug interface |
| 4143301053 | CONNECTING PART | Intermediate shaft adapter |
| 0636100600 | CAP SCREW | M10 flange bolt |
| 0636101024 | CAP SCREW | M12 hex head bolt |
| 0730365159 | TYPE PLATE | Identification nameplate |
| 0631311009 | GROOVED STUD | Threaded alignment pin |
