Overview
The ZF 4642.153.490 COUPLING is a critical OEM genuine component engineered for the WG 150 Series transmission. This precision-machined coupling serves as the primary torque transfer interface between the engine output and the transmission input shaft, ensuring smooth power delivery and driveline alignment. Positioned directly within the bell housing assembly, the 4642.153.490 coupling absorbs torsional vibrations and compensates for minor misalignment during operation. As a factory-specified replacement part, it maintains the exact tolerances required for long-term reliability in heavy-duty industrial applications. This coupling is often replaced alongside the TRANSMISSION HOUSING (4642101108) and the TRANSMISSION HOUSING (4642301208) during major overhauls.
Symptoms of Failure
- Audible clunking or knocking during gear engagement: Worn coupling teeth or splines cause backlash, producing metallic noises when shifting from neutral to drive or reverse.
- Vibration at low RPM under load: Degraded elastomeric elements in the coupling fail to dampen harmonics, resulting in noticeable chassis vibration between 800-1200 RPM.
- Oil seepage from bell housing drain hole: Cracks in the coupling hub allow transmission fluid to migrate past the seal, leaving visible drips under the vehicle after extended operation.
- Intermittent loss of power transfer: Severe spline wear causes the coupling to slip momentarily under heavy torque, leading to hesitation during acceleration.
Technical Specifications
| Part Number | 4642.153.490 |
| Material | Forged alloy steel with nitrided splines |
| Outer Diameter | 153 mm |
| Overall Length | 98 mm |
| Weight | 2.85 kg |
| Spline Count | 14 internal / 14 external |
| OEM Reference | ZF 4642.153.490 |
| Torque Capacity | 1,450 Nm (estimated) |
Compatibility
This coupling is specifically designed for the ZF WG 150 Series transmission family. It is also compatible with the WG 180 and WG 200 models when used with the appropriate ADAPTER (4642306254). The 4642.153.490 coupling interfaces directly with the TYPE PLATE (0730365125) mounting surface and is secured using the GROOVED STUD (0631311009). For complete assembly verification, always cross-reference your transmission serial number against the OEM parts catalog.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4642101108 | TRANSMISSION HOUSING | Encloses gear train and supports shafts |
| 4642301208 | TRANSMISSION HOUSING | Alternate housing variant for WG series |
| 0730365125 | TYPE PLATE | Identification plate with serial number |
| 0631311009 | GROOVED STUD | Locating pin for coupling alignment |
| 4642301168 | SCREEN SHEET | Oil filter screen for sump |
| 4642301169 | SCREEN SHEET | Fine mesh screen for hydraulic circuit |
| 0636100621 | HEXAGON SCREW | Fastener for housing attachment |
| 0630361029 | SEALING CAP | Protects unused ports from contamination |
| 4642306254 | ADAPTER | Interface for non-standard bell housings |
| 0634303340 | O-RING | Seals coupling-to-housing joint |
