Overview
The ZF 4642.308.554 SPUR GEAR is a critical power transmission component engineered specifically for the WG 150 series transmission. This OEM genuine part, identified by SKU 4642.308.554, functions as the primary gear set responsible for transferring rotational force from the input shaft to the intermediate shaft within the planetary gear train. Precision-machined from high-strength alloy steel, this spur gear ensures smooth torque delivery and minimal backlash under heavy-duty industrial loads. It is designed to interface directly with the TRANSMISSION HOUSING (4642101109) and the TRANSMISSION HOUSING (4642301205), forming the core of the gear reduction assembly.
Symptoms of Failure
When the ZF 4642.308.554 spur gear begins to wear, operators will notice distinct performance degradation. Common failure indicators include:
- Audible gear whine or grinding noise during acceleration: Worn tooth profiles create irregular contact patterns, producing a high-pitched whine that intensifies under load.
- Intermittent gear slipping under heavy torque: As the gear teeth lose their hardened surface, the transmission may momentarily lose power transfer, especially during uphill climbs or when towing.
- Metallic debris in transmission fluid: Flaking or pitting on the gear teeth generates fine metal particles that contaminate the oil, often visible during routine fluid changes.
- Vibration through the driveline at specific RPM ranges: Uneven wear on the spur gear causes harmonic vibrations that resonate through the TYPE PLATE (0730365125) and mounting points.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 4642.308.554 |
| Gear Type | Spur Gear (Straight Cut) |
| Material | Case-Hardened Alloy Steel (20MnCr5 Equivalent) |
| Number of Teeth | 32 (Estimated) |
| Module | 4.5 mm (Estimated) |
| Outer Diameter | 153 mm (Estimated) |
| Bore Diameter | 45 mm (Estimated) |
| Face Width | 38 mm (Estimated) |
| Weight | 1.85 kg (Estimated) |
| Hardness | HRC 58-62 (Case) |
| OEM Reference | ZF 4642.308.554 |
Compatibility
This genuine ZF spur gear is primarily designed for the WG 150 series transmission. Based on its gear geometry and spline configuration, it is also compatible with the following ZF models that share the same planetary gear architecture: WG 180, WG 200, and WG 250. It is essential to verify the gear ratio and tooth count against your specific transmission serial number. The gear mounts securely using the GROOVED STUD (0631311009) for precise axial alignment.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4642101109 | TRANSMISSION HOUSING | Encloses and supports the gear assembly |
| 4642301205 | TRANSMISSION HOUSING | Secondary housing for bearing support |
| 0730365125 | TYPE PLATE | Identification plate for transmission specs |
| 0631311009 | GROOVED STUD | Alignment and fastening stud for gear |
| 4642301168 | SCREEN SHEET | Oil filtration screen for debris protection |
| 4642301169 | SCREEN SHEET | Secondary oil filtration element |
| 0636100621 | HEXAGON SCREW | Fastener for housing assembly |
| 4642301186 | SCREEN SHEET | Fine mesh screen for hydraulic circuit |
| 4644106231 | SHIFT SYSTEM | Controls gear engagement and selection |
| 4644306470 | GASKET | Seals housing joints to prevent leaks |
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