Overview
The ZF 4642.353.012 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 parallel shafts within the gear train, ensuring smooth torque delivery and reliable load distribution. Positioned within the intermediate shaft assembly, the SKU 4642.353.012 directly engages with adjacent gears to maintain correct gear ratios and minimize energy loss during operation. Its hardened steel construction and strict OEM tolerances make it essential for maintaining the structural integrity of the transmission under heavy-duty cycles.
Symptoms of Failure
- Whining or grinding noise during gear engagement: A worn 4642.353.012 spur gear often produces a high-pitched whine or metallic grinding sound, particularly under load or during acceleration. This noise indicates tooth surface degradation or pitting.
- Intermittent gear slipping or loss of torque: As the gear teeth wear unevenly, the transmission may slip out of gear or fail to transmit full power, leading to erratic vehicle movement and reduced pulling capacity.
- Metallic debris in transmission fluid: Advanced wear of this spur gear generates fine metal particles that contaminate the oil, visible during fluid changes as glitter-like shavings. This accelerates damage to other internal components.
- Vibration at specific RPM ranges: A damaged gear profile causes harmonic vibrations felt through the drivetrain, often localized to certain speed bands, indicating misalignment or tooth breakage.
Technical Specifications
| Part Number | 4642.353.012 |
| Product Name | SPUR GEAR |
| Material | Case-hardened alloy steel (20MnCr5 equivalent) |
| Module | 4.5 mm |
| Number of Teeth | 28 |
| Outside Diameter | 135 mm |
| Face Width | 32 mm |
| Bore Diameter | 45 mm |
| Weight | 1.85 kg |
| OEM Reference | ZF 4642.353.012 |
| Hardness | 58-62 HRC |
Compatibility
This spur gear is primarily designed for the ZF WG 150 series transmission, but its modular design also supports the WG 180 and WG 200 models when used in conjunction with the correct TRANSMISSION HOUSING (4642101109) or TRANSMISSION HOUSING (4642301205). It is compatible with all WG 150 variants, including standard and heavy-duty configurations. For proper identification, always verify the TYPE PLATE (0730365125) on your unit. Secure installation requires the GROOVED STUD (0631311009) to ensure correct axial positioning.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4642101109 | TRANSMISSION HOUSING | Encloses and supports gear train assembly |
| 4642301205 | TRANSMISSION HOUSING | Alternative housing for WG150 variants |
| 0730365125 | TYPE PLATE | Identification plate for transmission model |
| 0631311009 | GROOVED STUD | Secures gear positioning on shaft |
| 4642301168 | SCREEN SHEET | Filters debris from lubricating oil |
| 4642301169 | SCREEN SHEET | Secondary oil filtration element |
| 0636100621 | HEXAGON SCREW | Fastener for housing assembly |
| 4642301186 | SCREEN SHEET | Fine mesh oil strainer |
| 4644106231 | SHIFT SYSTEM | Controls gear engagement mechanism |
| 4644306470 | GASKET | Seals housing joints against leaks |
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