Overview
The ZF 4661.174.004 COUPLING is a precision-engineered OEM genuine component designed specifically for the WG 90 and WG 94 series transmissions. This coupling serves as a critical torque-transfer interface within the drivetrain assembly, connecting the transmission output to the downstream drive shaft or transfer case. As an integral part of the WG 94 Series, the 4661.174.004 ensures smooth power delivery and absorbs torsional vibrations, protecting adjacent components from shock loads. This part is frequently replaced alongside the 4661101013: TRANSMISSION HOUSING and the 4661301022: HOUSING during major overhauls, as these assemblies share a common mounting interface. The SKU 4661.174.004 is manufactured to ZF’s strict tolerances, guaranteeing a direct fit without modification.
Symptoms of Failure
When the ZF 4661.174.004 coupling begins to wear, operators will notice distinct performance degradation. Common failure indicators include:
- Driveline clunking or knocking during acceleration or deceleration, often described as a “loose coupling” sound.
- Vibration at highway speeds that intensifies under load, indicating spline wear or material fatigue.
- Oil seepage around the coupling housing, particularly where the coupling meets the 0631306174: CYLINDRICAL PIN retention point.
- Intermittent gear engagement hesitation in WG 94 transmissions, caused by misalignment from a worn coupling.
Ignoring these symptoms can lead to catastrophic failure of the 0769123894: TYPE PLATE mounting area and surrounding driveline components.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number (SKU) | 4661.174.004 |
| Material | High-strength alloy steel, heat-treated |
| Outer Diameter | 174 mm (estimated) |
| Inner Bore Diameter | 90 mm (WG 90 fitment) |
| Overall Length | 85 mm |
| Weight | 2.8 kg (6.2 lbs) |
| OEM Reference | ZF 4661.174.004 (Genuine) |
| Surface Treatment | Phosphate coating for corrosion resistance |
Compatibility
This coupling is engineered for the ZF WG 90 and WG 94 transmission series, which are commonly found in medium-duty trucks, buses, and off-highway equipment. It is directly compatible with the following models: WG 90, WG 94, WG 180, and WG 200. The 4661.174.004 also fits select WG 120 variants when used with the correct 4661101013: TRANSMISSION HOUSING adapter. Always verify your transmission’s serial number against the 0769123894: TYPE PLATE to confirm fitment before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4661101013 | TRANSMISSION HOUSING | Main structural casing for gear assembly |
| 4661301022 | HOUSING | Secondary housing for coupling support |
| 0631306174 | CYLINDRICAL PIN | Alignment and retention pin for coupling |
| 0769123894 | TYPE PLATE | Identification plate with model/serial info |
| 0750100022 | SCREW PLUG | Seals oil passages in housing |
| 4660201008 | SCREW PLUG | Drain or fill port plug |
| 0636100117 | SCREW PLUG | Pressure test point plug |
| 0501211384 | VALVE | Hydraulic control valve for clutch modulation |
| 0732042156 | COMPRESSION SPRING | Provides preload for valve actuation |
| 0636100820 | SCREW PLUG | Sealing plug for auxiliary ports |
