Overview
The ZF 4642.351.071 SPUR GEAR is a precision-machined helical gear designed for the WG150 series transmission. This OEM genuine part sits within the intermediate shaft assembly, where it transfers torque from the input shaft to the planetary gear sets. As a critical component of the drivetrain, the spur gear ensures smooth power delivery and load distribution under high-torque conditions. The SKU 4642.351.071 is manufactured to ZF’s exacting tolerances, using case-hardened steel to resist wear from continuous meshing. When installed alongside the 4642101109: TRANSMISSION HOUSING and the 4642301205: TRANSMISSION HOUSING, this gear maintains proper shaft alignment and reduces vibration. The 0730365125: TYPE PLATE provides essential identification for this assembly, while the 0631311009: GROOVED STUD secures the housing components during operation.
Symptoms of Failure
When the ZF 4642.351.071 spur gear wears out, operators may notice distinct failure indicators. Whining or grinding noise during gear engagement often signals tooth surface fatigue or pitting, especially under load. Intermittent gear slipping under acceleration occurs when worn teeth fail to maintain positive contact with mating gears, leading to power loss. Metallic debris in transmission fluid is a common sign of spalling or chipping, visible during oil changes. Vibration at specific RPM ranges indicates uneven tooth wear or shaft misalignment, which can accelerate damage to adjacent components like the 4642301168: SCREEN SHEET.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4642.351.071 |
| Gear Type | Helical Spur Gear |
| Material | Case-Hardened Alloy Steel (20MnCr5) |
| Outside Diameter | 142.5 mm |
| Root Diameter | 128.3 mm |
| Face Width | 38.0 mm |
| Module | 4.5 |
| Number of Teeth | 29 |
| Weight | 1.85 kg |
| Hardness | 58-62 HRC |
| OEM Reference | ZF 4642.351.071 |
Compatibility
This spur gear is primarily engineered for the ZF WG150 series transmission, but it also fits select models in the WG180 and WG200 families due to shared intermediate shaft dimensions. Compatible transmissions include WG150-5, WG150-6, WG180-5, and WG200-4 variants. Always verify the gear’s tooth count and module against your existing assembly. For proper installation, pair this gear with the 0636100621: HEXAGON SCREW for secure mounting, and use the 4644306470: GASKET to prevent fluid leaks. The 4644106231: SHIFT SYSTEM must be correctly timed to this gear for proper clutch engagement.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4642101109 | TRANSMISSION HOUSING | Encloses gear train and supports shafts |
| 4642301205 | TRANSMISSION HOUSING | Secondary housing for clutch pack assembly |
| 0730365125 | TYPE PLATE | Identification tag for transmission model |
| 0631311009 | GROOVED STUD | Secures housing halves with precise torque |
| 4642301168 | SCREEN SHEET | Filters debris from lubrication oil |
| 4642301169 | SCREEN SHEET | Secondary oil filtration element |
| 0636100621 | HEXAGON SCREW | Fastener for gear retention on shaft |
| 4642301186 | SCREEN SHEET | Fine mesh filter for valve body |
| 4644106231 | SHIFT SYSTEM | Hydraulic control unit for gear changes |
| 4644306470 | GASKET | Seals housing joint against oil leaks |
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