Overview
The ZF 4646.151.079 COUPLING is a precision-engineered OEM sub-assembly designed to transfer torque between the engine and the transmission pump drive within the WG 250, WG 260, and WG 310 series. This critical component sits directly on the input shaft, acting as a flexible interface that absorbs torsional vibrations and compensates for minor misalignment during operation. As a genuine ZF part, the SKU 4646.151.079 ensures exact fitment and durability, preventing premature wear on adjacent driveline components. When replacing this coupling, it is essential to also inspect the 0636115293: 螺栓 and 0736300232: 螺栓 that secure the assembly, as these fasteners are frequently reused but should be replaced to maintain clamping integrity.
Symptoms of Failure
- Oil leaks at the bell housing area: A worn 4646.151.079 coupling often causes seal distortion, leading to transmission fluid weeping from the front pump interface.
- Gear slipping under load: When the coupling loses its damping capacity, torsional shock transfers directly to the clutch packs, resulting in erratic shifting or delayed engagement.
- Abnormal vibration at idle: Deteriorated rubber elements within the coupling produce a low-frequency shudder that intensifies when the transmission is in gear.
- Metallic rattling from the pump drive: Excessive play in the coupling hub creates a distinct clattering noise, especially during cold starts or throttle changes.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4646.151.079 |
| Outer Diameter | 120 mm (estimated) |
| Inner Diameter (Shaft) | 35 mm (estimated) |
| Overall Length | 65 mm (estimated) |
| Material | Steel hub with elastomeric damping insert |
| Weight | 0.85 kg (estimated) |
| OEM Reference | ZF 4646.151.079 |
Compatibility
This coupling is specifically engineered for ZF WG series transmissions, including the WG 250, WG 260, WG 261, and WG 310 models. It also fits select variants of the WG 180 and WG 200 series where the pump drive configuration matches. Always verify the spline count and pilot diameter before installation. During service, the 4475280208: SCREW PLUG should be removed to drain residual fluid, and the 0634316523: O-RING must be replaced to prevent future leaks at the housing interface.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 0630361026 | SEALING CAP | Protects the coupling cavity from debris ingress |
| 0501214611 | 齿轮泵 | Hydraulic pump driven by the coupling |
| 0634313945 | O形圈 | Seals the pump mounting flange |
| 0501322534 | TEMPERATURE SENSOR | Monitors fluid temperature near the coupling |
| 0634313366 | O-RING | Secondary seal for the coupling housing |
| 4644301014 | 挡油盘 | Directs oil flow away from the coupling |
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