Overview
The ZF 4646.151.486 COUPLING is a precision-engineered OEM sub-assembly designed to transmit torque between the engine and the transmission input shaft in the WG 250, WG 260, and WG 310 series. This coupling absorbs torsional vibrations and compensates for minor misalignment, ensuring smooth power delivery and protecting downstream components from shock loads. As a critical interface element, it sits directly behind the flexplate and before the torque converter hub. The SKU 4646.151.486 is a direct replacement for the factory-installed unit, maintaining the exact balance and fitment specifications required for reliable operation in heavy-duty industrial applications.
Symptoms of Failure
- Oil leaks near the bell housing: When the coupling seal degrades, transmission fluid can seep past the hub, leaving visible drips or wet spots around the front of the transmission.
- Vibration during acceleration: A worn or cracked coupling loses its dampening ability, causing noticeable shuddering or shaking in the driveline, especially under load between 1200–1800 RPM.
- Metallic clicking or clunking sounds: As the coupling splines or rubber elements wear, loose engagement produces audible noise when shifting between forward and reverse gears.
- Erratic gear engagement or slipping: A failing coupling can cause inconsistent torque transfer, leading to delayed or harsh shifts, particularly in the WG 260 and WG 310 series transmissions.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 4646.151.486 |
| Outer Diameter | 310 mm (estimated) |
| Inner Diameter (Hub) | 65 mm (estimated) |
| Overall Height | 85 mm (estimated) |
| Material | High-tensile steel hub with rubberized dampening insert |
| Weight | 4.2 kg (estimated) |
| OEM Reference | ZF 4646.151.486 |
| Torque Capacity | Up to 1,200 Nm (estimated) |
Compatibility
This coupling is specifically engineered for ZF WG-series transmissions used in industrial vehicles, material handlers, and construction equipment. It is a direct fit for the WG 250, WG 258, WG 260, and WG 310 series. It may also be compatible with earlier WG 180 and WG 200 models when used with the correct TRANSMISSION HOUSING (part 4646101162) and HOUSING (part 4646301334). Always verify spline count and pilot bore dimensions before installation. The coupling is secured using 螺栓 (part 0636115293) and must be paired with the correct TYPE PLATE (part 0730365125) for proper identification.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4646101162 | TRANSMISSION HOUSING | Encloses and supports the gear train |
| 4646301334 | HOUSING | Rear housing for output shaft support |
| 0636115293 | 螺栓 | Mounting bolt for coupling assembly |
| 0730365125 | TYPE PLATE | Identification plate for transmission model |
| 4646201003 | POT | Torque converter housing cover |
| 4646106024 | SHIFT SYSTEM | Hydraulic shift control assembly |
| 4646306071 | GASKET | Seal between housing and adapter plate |
| 4646306072 | ADAPTER PLATE | Interface plate for engine mounting |
| 4646306073 | GASKET | Seal for adapter plate joint |
| 0636102065 | CAP SCREW | Fastener for housing attachment |
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