Overview
The ZF 0730.103.421 SHIM is a precision-engineered adjustment component designed for the WG series of heavy-duty transmissions. This OEM genuine part, identified by SKU 0730.103.421, is installed between the transmission housing and the bearing support to establish the correct axial clearance and preload for the planetary gear sets. By taking up manufacturing tolerances, this shim ensures that the gear train operates within its specified end-play range, directly influencing shift quality and overall driveline longevity. It is a critical element in the final assembly of the WG 150 Series, WG 180 Series, WG 200 Series, WG 201 Series, and WG 65 Series transmissions.
Symptoms of Failure
When the 0730.103.421 shim wears or is incorrectly installed, the following failure symptoms typically emerge:
- Excessive axial gear play and clunking noises – A worn shim allows the planetary carrier to move beyond its design limits, producing a metallic clunk during acceleration or deceleration.
- Premature bearing fatigue and whining sounds – Incorrect preload caused by a degraded shim leads to uneven bearing loading, resulting in a high-pitched whine from the transmission under load.
- Oil leaks at the housing interface – As the shim thickness decreases, the seal compression changes, often causing fluid seepage around the TRANSMISSION HOUSING joint.
- Intermittent gear slipping under torque – Loss of proper clearance can cause the clutch packs to engage incompletely, leading to momentary power loss during gear changes.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 0730.103.421 |
| Material | Case-hardened spring steel (C67S) |
| Thickness | 0.50 mm (nominal) |
| Outer Diameter | 142.0 mm |
| Inner Diameter | 110.0 mm |
| Weight | 0.035 kg |
| OEM Reference | ZF 0730.103.421 |
| Surface Finish | Ground, deburred edges |
Compatibility
This shim is engineered for the following ZF transmission model families: WG 65 Series, WG 150 Series, WG 180 Series, WG 200 Series, and WG 201 Series. It is used in both on-highway truck and off-highway industrial applications. During installation, the shim is secured using HEXAGON SCREW fasteners (part 0636011038) and HEXAGON SCREW (0636011118) to the housing, while the HEXAGON SCREW (0636016015) secures the bearing retainer. Always verify the shim thickness against the factory service manual for your specific transmission serial number.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616101065 | TRANSMISSION HOUSING | Main structural casing for gear assembly |
| 0636011038 | HEXAGON SCREW | Fastens shim and bearing to housing |
| 0636011118 | HEXAGON SCREW | Secondary housing fastener |
| 0636016015 | HEXAGON SCREW | Bearing retainer bolt |
| 0631306085 | CYLINDRICAL PIN | Alignment dowel for housing |
| 0634313118 | O-RING | Seals housing joint |
| 0636304019 | SCREW PLUG | Closes oil passages |
| 0634801152 | SEALING RING | Prevents fluid bypass |
| 0732611049 | FILTER INSERT | Traps debris in oil circuit |
| 0634303718 | O-RING | Seals filter housing |
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