Overview
The ZF 4661.171.005 COUPLING is a critical OEM genuine component engineered for the WG 90 and WG 94 transmission series. This precision-machined coupling serves as the primary torque transfer interface between the engine output shaft and the transmission input assembly, ensuring smooth power delivery and driveline alignment. As a direct replacement part, the SKU 4661.171.005 is designed to maintain the exact tolerances required for ZF’s heavy-duty off-highway transmissions, reducing vibration and preventing premature wear on adjacent components. This coupling is often installed alongside the 4656183200: LOOSE PARTS kit and the 6073003011: CONTROL UNIT during a full transmission overhaul.
Symptoms of Failure
When the ZF 4661.171.005 coupling begins to degrade, operators typically notice three distinct failure indicators. First, transmission gear slipping under load becomes apparent, especially during uphill travel or when carrying heavy payloads. Second, abnormal driveline vibration at specific RPM ranges signals that the coupling’s splines or damping elements have worn beyond specification. Third, intermittent loss of power transfer during shifting events often points to this coupling failing to maintain proper engagement. In severe cases, metal debris in the transmission fluid can be detected during routine oil analysis, indicating the coupling is shedding material into the system. These symptoms are frequently accompanied by issues with the 4661101033: HOUSING or the 4661301096: HOUSING, which may also require inspection.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 4661.171.005 |
| OEM Reference | ZF Friedrichshafen AG |
| Material | High-strength alloy steel, induction-hardened |
| Outer Diameter | 180 mm (7.09 in) |
| Inner Diameter | 65 mm (2.56 in) |
| Overall Length | 95 mm (3.74 in) |
| Weight | 2.8 kg (6.17 lbs) |
| Spline Count | 24-tooth internal spline |
| Torque Capacity | 4,200 Nm (3,098 lb-ft) |
| Operating Temperature Range | -40°C to +120°C (-40°F to +248°F) |
Compatibility
This OEM genuine coupling is specifically engineered for the ZF WG 94 series, with direct fitment into the WG 90 and WG 94 transmission models. It is also compatible with the WG 180, WG 200, and WG 250 heavy-duty transmissions used in construction, mining, and agricultural equipment. The 4661.171.005 coupling interfaces with the 0631306174: CYLINDRICAL PIN for alignment and the 0769123894: TYPE PLATE for identification. For proper sealing, use the 0750100022: SCREW PLUG and the 4660201008: SCREW PLUG during installation. Additional fastening requires the 0636100117: SCREW PLUG and the 0501211384: VALVE for hydraulic circuit integration.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656183200 | LOOSE PARTS | Assembly hardware kit for coupling installation |
| 6073003011 | CONTROL UNIT | Electronic modulation of shift pressure |
| 4661101033 | HOUSING | Transmission case section for coupling chamber |
| 4661301096 | HOUSING | Rear housing cover for output shaft |
| 0631306174 | CYLINDRICAL PIN | Alignment dowel for coupling positioning |
| 0769123894 | TYPE PLATE | Identification tag for transmission model |
| 0750100022 | SCREW PLUG | Oil drain plug for coupling cavity |
| 4660201008 | SCREW PLUG | Pressure test port plug |
| 0636100117 | SCREW PLUG | Vent plug for housing |
| 0501211384 | VALVE | Hydraulic relief valve for coupling lubrication |
