Overview
The ZF 0630.501.133 RETAINING RING is a precision-engineered circlip designed to secure internal components within the WG200 and WG92 transmission series. 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. Installed directly inside the transmission housing, the retaining ring interfaces with the TRANSMISSION HOUSING and the HOUSING assembly to maintain precise gear alignment. The SKU 0630.501.133 is manufactured to ZF’s exacting tolerances, ensuring a snap-fit engagement that withstands vibration and thermal expansion in heavy-duty commercial applications.
Symptoms of Failure
- Transmission oil leaks near the output shaft – A worn or fatigued retaining ring can allow the seal carrier to shift, causing pressurized ATF to escape past the PERIPHERALS assembly.
- Gear slipping under load – When the ring loses its clamping force, planetary gear sets can drift axially, resulting in intermittent power loss during acceleration.
- Abnormal metallic rattling from the bell housing – A broken retaining ring permits loose components to vibrate against the RANGE SELECTOR mechanism, producing distinct noise at idle.
- Hard shifting between ranges – Axial play caused by a deformed ring interferes with hydraulic valve timing, leading to delayed engagement in WG200 and WG92 transmissions.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 0630.501.133 |
| Type | External retaining ring (circlip) |
| Material | Spring steel (DIN 17222, C67S) |
| Nominal Diameter | 130 mm (inner) × 140 mm (outer) |
| Thickness | 3.0 mm |
| Weight | 0.045 kg |
| OEM Reference | ZF 0630.501.133 |
| Surface Treatment | Phosphate-coated (corrosion resistant) |
Compatibility
This retaining ring is engineered for ZF WG series transmissions, including the WG180, WG200, WG92, WG94, and WG98 models. It is commonly used in the output shaft retention assembly of WG200 and WG92 gearboxes found in municipal trucks, refuse vehicles, and heavy-duty construction equipment. The part also fits select ZF Ecolife variants that share the same snap-ring groove dimensions. Always verify the groove width and shaft diameter against your transmission’s service manual before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4660198001 | PERIPHERALS | Seal and bearing support assembly |
| 0501209818 | RANGE SELECTOR | Hydraulic shift control valve |
| 4660101011 | TRANSMISSION HOUSING | Main structural casing |
| 4660301018 | HOUSING | Rear cover and bearing retainer |
| 0631306174 | CYLINDRICAL PIN | Alignment dowel for housing |
| 0769123894 | TYPE PLATE | Identification tag |
| 4660221012 | SUCTION TUBE | Oil pickup conduit |
| 0634100317 | O-RING | Hydraulic seal |
| 0636103273 | CAP SCREW | Fastener for housing |
| 0750100022 | SCREW PLUG | Drain port seal |
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