Overview
The ZF 0630.502.014 RETAINING RING is a precision-engineered OEM genuine component designed to secure axial positioning within the planetary gearset assembly of ZF WG150, WG180, and WG200 series transmissions. This snap ring fits into a machined groove on the output shaft or sun gear, preventing lateral displacement of bearings and clutch packs under high torque loads. The SKU 0630.502.014 is manufactured to ZF’s original tolerances, ensuring a positive lock that maintains gear alignment and prevents internal contact between rotating elements. When installed alongside a TRANSMISSION HOUSING (4642101108) or TRANSMISSION HOUSING (4642301208), this retaining ring forms a critical boundary between the hydraulic control section and the mechanical drive train.
Symptoms of Failure
- Intermittent gear slippage under load: A worn or fatigued retaining ring allows the sun gear to shift axially, causing clutch packs to partially disengage during acceleration.
- Metallic grinding noise from the transmission housing: When the ring loses its spring tension, rotating components contact the TRANSMISSION HOUSING (4642301208), producing a distinct scraping sound.
- Sudden loss of forward or reverse drive: Complete ring fracture permits the gear train to walk out of its intended position, resulting in total torque interruption.
- Contaminated transmission fluid with metallic particles: Abrasion between the ring and its groove generates steel debris that circulates through the hydraulic system.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 0630.502.014 |
| Material | Spring steel (DIN 17222), phosphate coated |
| Inner Diameter | 62.0 mm |
| Outer Diameter | 72.5 mm |
| Thickness | 2.5 mm |
| Weight | 12 g |
| OEM Reference | ZF 0630.502.014 |
| Installation Torque | Not applicable (snap-fit) |
Compatibility
This retaining ring is a direct OEM replacement for the following ZF transmission models: WG150, WG180, and WG200 series. It is specifically used in the output shaft retention assembly of these powershift transmissions, which are common in construction equipment, agricultural tractors, and material handlers. The ring also fits certain variants of the WG120 series when used with a ADAPTER (4642306254). Always verify the groove width in your specific housing; the SEALING CAP (0630361029) and O-RING (0634303340) are frequently replaced concurrently during this service.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4642101108 | TRANSMISSION HOUSING | Encloses gear train and hydraulic valves |
| 4642301208 | TRANSMISSION HOUSING | Alternate housing for WG180 series |
| 0730365125 | TYPE PLATE | Identification tag for transmission model |
| 0631311009 | GROOVED STUD | Alignment dowel for housing assembly |
| 4642301168 | SCREEN SHEET | Filter mesh for oil return circuit |
| 4642301169 | SCREEN SHEET | Fine mesh filter for high-pressure side |
| 0636100621 | HEXAGON SCREW | Fastener for valve body attachment |
| 0630361029 | SEALING CAP | Closure for pressure test ports |
| 4642306254 | ADAPTER | Interface plate for PTO mounting |
| 0634303340 | O-RING | Hydraulic seal between housing sections |
