Overview
The ZF 4642.351.070 SPUR GEAR is a critical power transmission component engineered specifically for the WG 150 series transmission. This OEM genuine part sits within the planetary gear set assembly, where it precisely transfers torque between the input shaft and the intermediate shaft. The spur gear’s straight-cut teeth ensure efficient, low-noise operation under heavy load conditions. As an integral element of the gear train, the SKU 4642.351.070 directly influences shift quality and overall driveline durability. For proper installation, this gear interfaces with the 4642101109: TRANSMISSION HOUSING and the 4642301205: TRANSMISSION HOUSING, which provide the structural support and alignment necessary for long service life.
Symptoms of Failure
When the ZF 4642.351.070 spur gear begins to wear, operators may notice several distinct failure indicators. Whining or grinding noise during gear engagement is a common early sign, often caused by pitting or chipping on the tooth flanks. Intermittent gear slipping under load occurs as the gear loses its ability to maintain positive engagement, leading to power loss during acceleration. Metallic debris in the transmission oil filter is a telltale symptom of advanced wear, as fragments from the spur gear contaminate the lubrication system. Additionally, vibration in the driveline at specific RPM ranges may indicate uneven tooth wear or misalignment, often requiring immediate inspection of the 0730365125: TYPE PLATE for correct part identification before replacement.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4642.351.070 |
| Gear Type | Spur Gear (Straight-Cut) |
| Material | Case-Hardened Alloy Steel (20MnCr5 equivalent) |
| Number of Teeth | 28 (estimated) |
| Module | 4.5 mm (estimated) |
| Outside Diameter | 135 mm (estimated) |
| Face Width | 32 mm (estimated) |
| Weight | 1.85 kg (estimated) |
| OEM Reference | ZF 4642.351.070 |
| Hardness | 58-62 HRC (estimated) |
Compatibility
This ZF 4642.351.070 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 WG 180 and WG 200 series models that share the same planetary gear set architecture. The part may be found in certain WG 120 variants with matching torque ratings. Always verify the 0631311009: GROOVED STUD alignment during installation, as this fastener secures the gear hub to the shaft assembly. For transmissions with modified gear ratios, consult the original equipment documentation to confirm fitment.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4642101109 | TRANSMISSION HOUSING | Encloses and supports gear train assembly |
| 4642301205 | TRANSMISSION HOUSING | Provides bearing bores and oil passages |
| 0730365125 | TYPE PLATE | Identifies transmission model and serial number |
| 0631311009 | GROOVED STUD | Secures gear hub to shaft |
| 4642301168 | SCREEN SHEET | Filters debris from oil flow |
| 4642301169 | SCREEN SHEET | Secondary filtration element |
| 0636100621 | HEXAGON SCREW | Fastens housing components |
| 4642301186 | SCREEN SHEET | Fine mesh oil strainer |
| 4644106231 | SHIFT SYSTEM | Controls gear engagement |
| 4644306470 | GASKET | Seals housing joints |
Authorized ZF Distributor
We are a certified supplier of genuine ZF components.
