Overview
The ZF 0630.505.551 SNAP RING is a critical retention component engineered specifically for the WG 92 Series transmission. This OEM genuine snap ring secures internal assemblies—such as bearing packs and gear clusters—within the main gear train, preventing axial displacement during high-torque operation. Positioned inside the 4660101012: TRANSMISSION HOUSING, it ensures precise alignment of rotating elements. The SKU 0630.505.551 is manufactured to ZF’s exacting tolerances, guaranteeing a secure fit that maintains gear mesh integrity under heavy loads.
Symptoms of Failure
- Transmission oil leaks around the housing joint: A worn or broken snap ring can allow internal components to shift, compromising the seal between the 4660301020: HOUSING and the main case, leading to fluid seepage.
- Gear slipping under load: When the snap ring loses tension, bearing preload decreases, causing intermittent gear disengagement during acceleration or hill climbs.
- Abnormal whining or grinding noises: Axial play from a fatigued snap ring allows gear faces to contact housing walls, producing metallic sounds that worsen with RPM.
- Difficulty engaging or holding gears: A failed snap ring permits shaft walk, which misaligns shift forks and creates vague or incomplete gear engagement.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 0630.505.551 |
| Type | Internal Snap Ring (Circlip) |
| Material | Spring Steel (DIN 17222 / SAE 1070) |
| Surface Finish | Phosphate Coated (Anti-Corrosion) |
| Inner Diameter (Nominal) | 92 mm |
| Cross-Section Thickness | 3.5 mm |
| Weight | ~18 grams |
| OEM Reference | ZF 0630.505.551 |
| Operating Temperature Range | -40°C to +150°C |
Compatibility
This snap ring is primarily designed for the ZF WG 92 Series transmission family. Based on its dimensions and retention function, it is also compatible with the following ZF models that share similar housing architectures: WG180, WG200, WG210, and WG220. It is frequently used in conjunction with the 0631306174: CYLINDRICAL PIN for aligning bearing races, and the 0769123894: TYPE PLATE for unit identification. Always verify fitment against your transmission’s serial number before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4660101012 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4660301020 | HOUSING | Secondary housing for clutch/brake packs |
| 0631306174 | CYLINDRICAL PIN | Alignment dowel for housing mating |
| 0769123894 | TYPE PLATE | Identification tag for transmission model |
| 4660221012 | SUCTION TUBE | Oil pickup conduit from sump |
| 0634100317 | O-RING | Static seal for fluid passages |
| 0636103273 | CAP SCREW | Fastener for housing retention |
| 0750100022 | SCREW PLUG | Sealing plug for inspection ports |
| 4660101804 | TRANSMISSION HOUSING | Alternate housing variant for WG92 |
| 4660301008 | HOUSING | Alternate secondary housing assembly |
