Overview
The ZF 0630.502.007 RETAINING RING is a precision-engineered circlip designed to secure internal components within the WG65 transmission assembly. This OEM genuine part, identified by SKU 0630.502.007, functions as a critical axial lock for gear sets and bearing assemblies, preventing unwanted movement under high-torque conditions. Positioned inside the differential housing, this retaining ring ensures that adjacent components such as the 5838109009: DIFFERENTIAL remain correctly seated during operation. Without this ring, the entire gear train can shift, leading to rapid wear and mechanical failure.
Symptoms of Failure
When the ZF 0630.502.007 retaining ring fatigues or breaks, operators often notice specific failure indicators. 1. Unexplained gear slippage under load — a worn ring allows shafts to drift, causing intermittent power loss. 2. Metallic rattling from the transmission housing — loose components like the 0750117075: TAPER ROLLER BEARING can vibrate against the casing. 3. Oil contamination with metal debris — a fractured ring sheds hardened steel particles into the lubricant. 4. Difficulty engaging gears — axial play from a missing or deformed ring misaligns shift forks. These symptoms often lead technicians to search for “ZF WG65 retaining ring failure symptoms” or “transmission circlip broken noise.”
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 0630.502.007 |
| Material | Spring steel (DIN 17222) |
| Inner Diameter | 62 mm |
| Outer Diameter | 70 mm |
| Thickness | 2.5 mm |
| Weight | 0.012 kg |
| OEM Reference | ZF 0630.502.007 |
| Surface Treatment | Phosphate coated |
Compatibility
This retaining ring is engineered for the ZF WG65 series transmission, commonly found in medium-duty trucks and industrial machinery. Based on its design and dimensions, it also fits the following ZF models: WG65, WG80, WG120, WG150, WG180, and WG200. Always verify the snap ring groove diameter before installation. The ring works in conjunction with the 2093209023: DIFFERENTIAL and the 5838300626: DIFFERENTIAL HOUSING to maintain proper gear spacing. For heavy-duty applications, pairing this ring with a new taper roller bearing ensures optimal load distribution.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 5838109009 | DIFFERENTIAL | Distributes torque between drive wheels |
| 0750117075 | TAPER ROLLER BEARING | Supports radial and axial shaft loads |
| 2093209023 | DIFFERENTIAL | Secondary differential for planetary gear sets |
| 5838300626 | DIFFERENTIAL HOUSING | Encloses differential gears and bearings |
| 0631329088 | SPRING PIN | Locks retaining ring in groove |
| 5838300811 | THRUST WASHER | Reduces axial friction between gears |
| 5838300721 | AXLE BEVEL GEAR | Transfers power to axle shafts |
| 5838300633 | AXLE | Connects differential to wheel hubs |
| 5838300753 | THRUST WASHER | Spacer for bevel gear alignment |
| 5838300818 | THRUST WASHER | Secondary axial load distributor |
Frequently Asked Questions
Q: Can I reuse the ZF 0630.502.007 retaining ring after removal?
A: No. This is a single-use snap ring. Reusing it risks groove damage and sudden failure. Always install a new OEM ring during transmission rebuilds.
Q: How do I know if the retaining ring is the correct size for my WG65?
A: Measure the groove diameter in your differential housing. The ring’s outer diameter must be 70 mm with a 2.5 mm thickness. Cross-reference with the 5838300626: DIFFERENTIAL HOUSING specifications.
Q: What tools are needed to replace this retaining ring?
A: Use internal snap ring pliers with 90-degree tips. Apply assembly grease to hold the ring in the groove during installation of the 0750117075: TAPER ROLLER BEARING.
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