Overview
The ZF 4108.322.057 SHAFT is a critical internal component engineered for the WG100, WG130, and WG131 transmission series. This genuine OEM part functions as the primary torque-transfer element within the gear train, ensuring precise rotational alignment between the input and output stages. The SKU 4108.322.057 is machined to exact ZF tolerances to maintain gear mesh integrity under heavy-duty cycles. When installed alongside the 4108101115 HOUSING and 4108201277 HOUSING, this shaft forms the core of the transmission’s power path, directly influencing shift quality and load capacity.
Symptoms of Failure
- Audible gear whine or grinding during acceleration – Worn splines or bearing journals on the 4108.322.057 shaft create uneven contact patterns, producing a high-pitched noise that intensifies under load.
- Intermittent gear slipping in forward gears – A fatigued shaft surface can cause the mating gears to lose proper engagement, leading to sudden power loss or delayed engagement.
- Metallic debris in transmission fluid – Flaking or pitting on the shaft’s hardened surface contaminates the oil, often visible during drain intervals. This symptom is frequently accompanied by a failing 0501313402 DRAIN VALVE.
- Vibration at specific RPM ranges – Dynamic imbalance from shaft wear transmits through the 4108301304 BEARING COVER, causing noticeable chassis vibration.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4108.322.057 |
| Material | Case-hardened alloy steel (20MnCr5 equivalent) |
| Overall Length | 312 mm (estimated) |
| Journal Diameter | 45 mm (estimated) |
| Spline Count | 24-tooth involute (estimated) |
| Weight | 2.8 kg (estimated) |
| OEM Reference | ZF 4108.322.057 |
| Surface Hardness | 58-62 HRC |
Compatibility
This genuine shaft is specifically designed for the ZF WG100, WG130, and WG131 series transmissions. It is also compatible with select variants of the WG180 and WG200 models where the input shaft length and spline geometry match. Always verify the existing shaft’s part number before replacement. For complete assembly, pair this shaft with the 4108306173 GASKET and 0750110040 SHAFT SEAL to prevent fluid leaks. Additional support components include the 4108111051 POWER TAKE-OFF and the washer set: 0730106757 WASHER, 0730106758 WASHER, and 0730106759 WASHER.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4108101115 | HOUSING | Encloses the shaft and gear assembly |
| 4108201277 | HOUSING | Secondary housing for bearing support |
| 0501313402 | DRAIN VALVE | Controls fluid evacuation during service |
| 4108301304 | BEARING COVER | Seals and protects the shaft bearing |
| 4108306173 | GASKET | Prevents oil leakage at housing joints |
| 0750110040 | SHAFT SEAL | Dynamic seal for rotating shaft |
| 4108111051 | POWER TAKE-OFF | Drives auxiliary hydraulic pumps |
| 0730106757 | WASHER | Thrust washer for axial load distribution |
| 0730106758 | WASHER | Spacer washer for gear alignment |
| 0730106759 | WASHER | Locking washer for shaft retention |
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