Overview
The ZF 4661.175.001 COUPLING is a critical driveline component engineered for the WG 90 and WG 94 transmission series. This OEM genuine part serves as the primary torque-transfer interface between the engine output and the transmission input shaft, ensuring smooth power delivery and torsional vibration dampening. As a precision-machined coupling, it directly interfaces with the 4661101001: TRANSMISSION HOUSING to maintain concentric alignment under high-load conditions. The SKU 4661.175.001 is manufactured to ZF’s exacting tolerances, making it a direct replacement for worn units in heavy-duty industrial applications.
Symptoms of Failure
- Transmission gear slipping under load: When the coupling splines wear, the connection between the engine and transmission loses integrity, causing intermittent power loss during acceleration or uphill operation.
- Abnormal driveline vibration: A worn 4661.175.001 coupling creates rotational imbalance, resulting in low-frequency shuddering felt through the chassis, particularly at 1,200–1,800 RPM.
- Oil seepage at the bell housing joint: Deterioration of the coupling’s sealing surface allows transmission fluid to migrate past the 0634100633: O-RING, leaving visible drips under the vehicle.
- Metallic grinding noise during gear engagement: Advanced wear causes metal-to-metal contact between the coupling and the 4661301007: HOUSING, producing a distinct scraping sound.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4661.175.001 |
| Material | High-tensile alloy steel (case-hardened) |
| Outer Diameter | 175 mm ±0.05 mm |
| Inner Spline Diameter | 90 mm (WG 90 series) |
| Overall Length | 82 mm |
| Weight | 3.4 kg (7.5 lbs) |
| OEM Reference | ZF 4661.175.001 |
| Operating Torque Range | 1,200–2,400 Nm |
| Max RPM | 3,200 |
Compatibility
This coupling is specifically designed for the ZF WG 90 and ZF WG 94 transmission families. It is also compatible with the following ZF models that share the same spline geometry and mounting interface: WG 180, WG 200, and select variants of the WG 120 series. The part integrates with the 4661301093: TUBE for lubrication routing and is secured using the 0631306174: CYLINDRICAL PIN for precise alignment. Always verify your transmission’s serial number against ZF’s application guide before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4661101001 | TRANSMISSION HOUSING | Encloses and supports the gear train |
| 4661301007 | HOUSING | Secondary housing for clutch pack assembly |
| 4661301093 | TUBE | Oil supply conduit to the coupling |
| 0631306174 | CYLINDRICAL PIN | Alignment dowel for coupling installation |
| 0769123894 | TYPE PLATE | Identification label for transmission model |
| 0750100022 | SCREW PLUG | Seals oil drain or fill ports |
| 0636302602 | SCREW PLUG | Magnetic plug for debris collection |
| 0634100633 | O-RING | Hydraulic seal between coupling and housing |
| 4661301029 | NOZZLE | Lubrication jet for gear mesh |
| 4661301027 | NOZZLE | Secondary lubrication nozzle |
