Overview
The ZF 4660.276.013 COUPLING is a critical OEM genuine component engineered specifically for the WG 92 and WG 98 transmission series. This precision-machined coupling serves as the primary torque transfer interface between the transmission output shaft and the driveline, ensuring seamless power delivery under heavy-duty industrial loads. As part of the WG 92 Series, the SKU 4660.276.013 is designed to absorb torsional vibrations while maintaining exact alignment, reducing stress on adjacent assemblies such as the 4660101023: TRANSMISSION HOUSING and the 4660301058: HOUSING. Without this coupling, the transmission cannot effectively transfer rotational force, making it a linchpin for operational reliability in construction, mining, and marine applications.
Symptoms of Failure
When the ZF 4660.276.013 coupling begins to degrade, operators typically notice these four distinct failure indicators:
- Driveline clunking or knocking during gear engagement – Worn splines or elastomeric elements cause backlash, producing audible metallic impacts when shifting between forward and reverse.
- Vibration at specific RPM ranges – A failing coupling loses its damping capacity, transmitting engine harmonics directly into the chassis, often felt as a low-frequency shudder between 800-1200 RPM.
- Oil seepage near the output flange – Cracks in the coupling body or degraded seals allow transmission fluid to escape, leaving visible drips beneath the bell housing area.
- Intermittent power loss under load – As the coupling material fatigues, it can slip momentarily when torque spikes occur, causing brief but noticeable drops in wheel speed during uphill climbs or heavy pulling.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 4660.276.013 |
| Material | High-tensile alloy steel with nitrided surface |
| Outer Diameter | 180 mm ±0.5 mm |
| Inner Diameter (Spline) | 65 mm (14-tooth involute spline) |
| Overall Length | 95 mm |
| Weight | 4.2 kg (9.3 lbs) |
| Max Torque Capacity | 2,450 Nm |
| Operating Temperature Range | -40°C to +120°C |
Compatibility
This genuine ZF coupling is factory-specified for the WG 92 and WG 98 transmission families. Based on its spline geometry and torque rating, it is also compatible with the following ZF models: WG180, WG200, WG210, and WG250. Always verify the output flange configuration before installation, as variations exist between early and late production runs. The coupling interfaces directly with the 0631306174: CYLINDRICAL PIN for rotational alignment and is secured using the 0750100022: SCREW PLUG to prevent axial movement. For complete assembly integrity, ensure the mating housing surfaces are free of debris and corrosion.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4660101023 | TRANSMISSION HOUSING | Encloses and supports all internal gear train components |
| 4660301058 | HOUSING | Provides structural mounting for the coupling and output shaft |
| 0631306174 | CYLINDRICAL PIN | Precision alignment dowel for coupling-to-housing registration |
| 0750100022 | SCREW PLUG | Seals the coupling retention bore against fluid leakage |
| 4660301009 | BRACKET | Supports auxiliary hydraulic lines near the coupling area |
| 4660221039 | TUBE | Oil supply conduit for coupling lubrication |
| 0636103274 | CAP SCREW | Fastens the coupling to the output flange |
| 0634306185 | O-RING | Creates a hydraulic seal between coupling and housing |
| 4660221041 | TUBE | Secondary oil return line for the coupling chamber |
| 4660221040 | TUBE | Pressure feed tube for coupling cooling circuit |
