Overview
The ZF 4660.275.018 COUPLING is a critical OEM genuine component engineered for the WG 92 and WG 98 transmission series. This precision-machined coupling serves as the primary torque transfer interface between the engine output and the transmission input shaft, ensuring seamless power delivery under heavy-duty industrial loads. As part number 4660.275.018, it is designed to absorb torsional vibrations and maintain driveline alignment within the transmission housing. This part sits directly behind the 4660101017: TRANSMISSION HOUSING and interfaces with the 4660301054: HOUSING II to create a sealed, high-torque assembly. The coupling is manufactured to ZF’s exacting tolerances, making it a direct replacement for worn units in WG 92 and WG 98 gearboxes.
Symptoms of Failure
- Torque fluctuation under load: A worn 4660.275.018 coupling often causes noticeable surging or hesitation during acceleration, particularly when the transmission is under heavy load. This symptom is frequently searched as “ZF WG92 torque fluctuation fix.”
- Metallic grinding or clunking noises: As the coupling splines wear, operators may hear distinct metallic sounds from the bell housing area, especially during gear engagement. This is a classic sign of coupling fatigue.
- Oil seepage at the coupling interface: Deterioration of the coupling’s sealing surface can lead to transmission fluid leaks around the input shaft area. This is often reported as “ZF WG98 oil leak at coupling.”
- Vibration at idle or low RPM: Excessive play in the coupling can transmit engine vibrations into the transmission, causing a shaking sensation in the cab or chassis.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 4660.275.018 |
| Material | High-strength alloy steel (heat-treated) |
| Outer Diameter | 185 mm |
| Inner Diameter | 75 mm |
| Overall Length | 95 mm |
| Weight | 3.2 kg |
| OEM Reference | ZF 4660.275.018 |
| Spline Count | 24 internal / 24 external |
| Torque Capacity | 2,800 Nm (max) |
Compatibility
This OEM genuine coupling is specifically designed for the ZF WG 92 and WG 98 transmission series. It is a direct fit for the following models: WG 92, WG 98, WG 120, WG 150, WG 180, and WG 200. The 4660.275.018 is also compatible with certain WG 250 variants when used with the correct 0631306174: CYLINDRICAL PIN for alignment. Always verify your transmission’s serial number against the 0769123894: TYPE PLATE to ensure proper fitment. This coupling replaces earlier part numbers 4660.275.010 and 4660.275.015.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4660101017 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4660301054 | HOUSING II | Secondary housing for clutch pack |
| 0631306174 | CYLINDRICAL PIN | Alignment dowel for coupling installation |
| 0769123894 | TYPE PLATE | Identification plate for transmission model |
| 0750100022 | SCREW PLUG | Seals oil passages in housing |
| 4660221029 | SUCTION TUBE | Oil pickup tube for lubrication |
| 0634100317 | O-RING | Seal between coupling and housing |
| 0636103273 | CAP SCREW | Fastener for coupling retention |
| 0634306311 | O-RING | Secondary seal for oil containment |
| 4660321029 | FIXING PLATE | Locks coupling to input shaft |
