Overview
The ZF 0630.004.020 SHIM RING is a precision-engineered spacer component designed for critical axial clearance management within the WG100, WG200, and WG201 transmission series. This OEM genuine part, identified by SKU 0630.004.020, sits directly between the main transmission housing and the output shaft assembly. By maintaining exacting tolerances, it prevents metal-on-metal contact between rotating elements and the stationary 4644101165: TRANSMISSION HOUSING. When installed correctly, this shim ring ensures proper preload on bearings, directly influencing gear mesh accuracy and overall drivetrain longevity.
Symptoms of Failure
- Audible whining or grinding from the transmission bell housing: A worn or collapsed shim ring allows excessive axial play, causing gear teeth to misalign under load.
- Intermittent gear slipping under moderate torque: As the clearance increases, the clutch packs may not fully engage, leading to a loss of power transfer during acceleration.
- Oil seepage at the housing joint: A degraded shim ring can distort the sealing surface between the 4644301304: HOUSING and the main case, allowing transmission fluid to weep past the gasket.
- Vibration through the shift lever at highway speeds: Uncontrolled axial movement of the output shaft induces harmonic vibrations that transmit directly into the cab.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number (SKU) | 0630.004.020 |
| Material | Hardened spring steel (C67S) with phosphate coating |
| Inner Diameter | 68.0 mm |
| Outer Diameter | 82.5 mm |
| Thickness | 1.20 mm (selective fit tolerance ±0.05 mm) |
| Weight | 0.042 kg |
| OEM Reference | ZF 0630.004.020 |
| Surface Finish | Ra 0.8 µm (ground) |
Compatibility
This shim ring is engineered for the ZF WG series of powershift transmissions. It is a direct fit for the following models: WG100, WG200, WG201, WG180, and WG190. It also applies to the WG120 and WG150 variants where the output shaft bearing preload specification matches the 1.20 mm shim thickness. Always verify the existing shim stack thickness before replacement, as selective fit shims are used during factory assembly. For complete assembly, pair this part with a new 0730365067: TYPE PLATE to ensure correct identification, and secure the assembly using the 0631311009: GROOVED STUD.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101165 | TRANSMISSION HOUSING | Main structural casing for gear and shaft support |
| 4644301304 | HOUSING | Secondary housing for clutch pack and valve body |
| 0730365067 | TYPE PLATE | Identification tag with transmission serial and model |
| 0631311009 | GROOVED STUD | Locating dowel for precise housing alignment |
| 4644106300 | SHIFT SYSTEM | Mechanical linkage for gear selection |
| 4644306500 | COVER PLATE | Sealing cover for access port |
| 4644159300 | SHIFT SYSTEM | Hydraulic shift actuator assembly |
| 4644306560 | VALVE BLOCK | Hydraulic control manifold for clutch modulation |
| 4644306408 | WASHER | Hardened thrust washer for axial load distribution |
| 4644107015 | SPEEDOMETER | Output speed sensor drive gear |
