Overview
The ZF 4642.353.026 SPUR GEAR is a critical power transmission component engineered specifically for the WG 150 Series transmission. This OEM genuine part functions as a precision-machined gear that transfers rotational force between shafts within the gear train, ensuring smooth torque delivery and optimal gear mesh alignment. Located in the intermediate shaft assembly, the SKU 4642.353.026 directly influences the transmission’s overall efficiency and noise reduction. When paired with a robust 4642101114: TRANSMISSION HOUSING or a 4642301213: TRANSMISSION HOUSING, this spur gear maintains precise shaft spacing and load distribution, which is essential for heavy-duty industrial applications.
Symptoms of Failure
- Whining or grinding noise during gear engagement: A worn 4642.353.026 spur gear produces a distinct high-pitched whine or metallic grinding sound, especially under load. This often indicates tooth surface pitting or chipping.
- Intermittent gear slipping under torque: When the gear teeth lose their profile due to wear, the transmission may momentarily lose power transfer, causing erratic vehicle movement or load drop-off.
- Metallic debris in transmission fluid: Flakes or particles in the oil filter or sump are a clear sign of spur gear degradation. This can lead to secondary damage to the 0636100621: HEXAGON SCREW and adjacent bearings.
- Increased operating temperature: Excessive friction from a damaged gear generates heat, which may trigger thermal warnings or cause fluid breakdown.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4642.353.026 |
| Gear Type | Spur Gear, Helical Cut |
| Material | Case-Hardened Alloy Steel (20MnCr5) |
| Number of Teeth | 42 (estimated) |
| Module | 4.5 mm |
| Outside Diameter | 198 mm |
| Face Width | 35 mm |
| Weight | 2.8 kg |
| OEM Reference | ZF 4642.353.026 |
| Hardness | 58-62 HRC |
Compatibility
This spur gear is primarily designed for the ZF WG 150 Series transmission, but it also fits select models within the broader WG family. Verified compatible transmissions include the WG 150, WG 180, and WG 200 series. The gear’s dimensions and tooth profile are shared with certain WG 120 variants, though confirmation of the 0730365125: TYPE PLATE is recommended before installation. For proper alignment, always use a 0631311009: GROOVED STUD during assembly to prevent axial misalignment.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4642101114 | TRANSMISSION HOUSING | Encloses and supports gear train assembly |
| 4642301213 | TRANSMISSION HOUSING | Alternative housing for WG series |
| 0730365125 | TYPE PLATE | Identification plate for transmission model |
| 0631311009 | GROOVED STUD | Alignment stud for gear positioning |
| 4642301168 | SCREEN SHEET | Oil filtration screen for debris protection |
| 4642301169 | SCREEN SHEET | Fine mesh screen for fluid cleanliness |
| 0636100621 | HEXAGON SCREW | Fastener for housing and cover plates |
| 4642301186 | SCREEN SHEET | Secondary filtration element |
| 4644106300 | SHIFT SYSTEM | Controls gear engagement and selection |
| 4644306500 | COVER PLATE | Seals transmission housing access point |
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