Overview
The ZF 4642.108.057 COUNTERSHAFT is a critical internal component within the WG 150 series transmission, responsible for transferring rotational force between gear clusters to facilitate smooth ratio changes under load. Machined from high-strength alloy steel, this OEM genuine part ensures precise alignment of the main shaft and layshaft assemblies. The SKU 4642.108.057 is specifically engineered to maintain the exacting tolerances required for heavy-duty industrial applications, reducing vibration and preventing premature gear wear. When paired with a robust 4642101109: TRANSMISSION HOUSING, the countershaft forms the backbone of the gear train, directly influencing torque delivery and operational longevity.
Symptoms of Failure
- Audible gear whine or grinding during acceleration: A worn countershaft bearing journal or spline wear creates uneven gear meshing, producing a distinct high-pitched noise that intensifies under load.
- Intermittent gear slipping in higher ranges: As the countershaft loses dimensional integrity, the layshaft can shift axially, causing partial disengagement of dog clutches and erratic power delivery.
- Metallic debris in transmission fluid: Flaking or spalling on the countershaft surface introduces ferrous particles into the oil, often visible during routine drain intervals or when inspecting the 4642301168: SCREEN SHEET.
- Excessive end-play or axial movement: Worn thrust faces on the countershaft allow measurable movement, leading to misalignment of the 0636100621: HEXAGON SCREW fasteners and eventual housing damage.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4642.108.057 |
| OEM Reference | ZF 4642.108.057 |
| Material | Case-hardened alloy steel (20MnCr5 equivalent) |
| Overall Length | 485 mm (estimated) |
| Journal Diameter | 45 mm (estimated) |
| Weight | 8.7 kg (estimated) |
| Spline Count | 24 involute splines |
| Heat Treatment | Carburized & tempered to HRC 58-62 |
Compatibility
This countershaft is primarily designed for the ZF WG 150 series, but its spline geometry and length also suit the WG 180 and WG 200 models when used with the correct 4642301205: TRANSMISSION HOUSING. It is compatible with all WG 150 variants (WG150-1, WG150-2, WG150-3) produced after 2005. For proper identification, always cross-reference the 0730365125: TYPE PLATE on your unit. The countershaft also integrates with the 0631311009: GROOVED STUD for secure bearing retention and the 4644106085: SHIFT SYSTEM for precise gear engagement.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4642101109 | TRANSMISSION HOUSING | Encloses and supports the countershaft assembly |
| 4642301205 | TRANSMISSION HOUSING | Alternate housing for WG180/WG200 compatibility |
| 0730365125 | TYPE PLATE | Identification plate for model verification |
| 0631311009 | GROOVED STUD | Bearing retention fastener |
| 4642301168 | SCREEN SHEET | Oil filtration mesh |
| 4642301169 | SCREEN SHEET | Alternate oil filter screen |
| 0636100621 | HEXAGON SCREW | Housing fastening bolt |
| 4642301186 | SCREEN SHEET | Fine-mesh debris screen |
| 4644106085 | SHIFT SYSTEM | Gear engagement actuator |
| 4642306050 | COVER PLATE | Access cover for inspection |
