Overview
The ZF 4108.322.042 SHAFT is a precision-machined component engineered for the internal power transfer assembly within ZF WG100, WG130, and WG131 transmissions. This OEM genuine part functions as the primary torque conduit between the input drive and the planetary gear sets, ensuring synchronized rotation under heavy load conditions. The SKU 4108.322.042 is specifically designed to interface with the 4108101112: HOUSING and the 4108201177: HOUSING, forming the core rotating assembly that modulates gear engagement in commercial vehicle transmissions.
Symptoms of Failure
- Intermittent gear slipping under load: When the 4108.322.042 shaft wears at its spline interface, the transmission may momentarily lose torque transfer during uphill climbs or heavy hauling, causing RPM spikes without acceleration.
- Metallic grinding noise from the bell housing: A worn shaft bearing journal creates radial play, producing a distinct grinding sound that intensifies when shifting between forward and reverse gears.
- Transmission fluid contamination with metallic particles: Surface spalling on the shaft’s hardened layer sheds microscopic steel debris into the oil, visible as glitter in the fluid during routine drain inspections.
- Vibration at specific RPM ranges: Dynamic imbalance from shaft wear generates low-frequency vibration felt through the chassis, particularly between 1200-1800 RPM in WG130 models.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4108.322.042 |
| Overall Length | 285 mm (estimated) |
| Shaft Diameter | 42 mm (bearing journal) |
| Spline Count | 24 involute splines |
| Material | Case-hardened 20MnCr5 steel |
| Weight | 3.2 kg (7.05 lbs) |
| OEM Reference | ZF 4108.322.042 |
| Surface Hardness | 58-62 HRC |
Compatibility
This shaft is validated for direct installation in ZF WG100, WG130, and WG131 transmission models. It also fits select variants of the WG180 and WG200 series when used with the appropriate 4108301304: BEARING COVER and 0636302056: SCREW PLUG. For WG180 applications, verify the housing bore diameter matches the shaft’s bearing journal. The part is not compatible with pre-2005 WG series transmissions without the updated 4108102042: INPUT assembly.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4108101112 | HOUSING | Encloses the shaft assembly and supports bearing alignment |
| 4108201177 | HOUSING | Secondary housing for output shaft retention |
| 0636302056 | SCREW PLUG | Seals oil passages in the shaft housing |
| 4108301304 | BEARING COVER | Secures the shaft bearing in position |
| 4108306173 | GASKET | Prevents oil leakage between shaft and housing |
| 0750110040 | SHAFT SEAL | Dynamic seal for the shaft exit point |
| 4108102042 | INPUT | Torque input coupling for the shaft |
| 4108302099 | PLANET CARRIER | Holds planetary gears driven by the shaft |
| 4108302007 | BEARINGSHEET | Shim set for shaft bearing preload adjustment |
| 0635332196 | BALL BEARING | Supports radial shaft loads |
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