Overview
The ZF 4660.251.033 COUPLING is a critical torque-transfer component engineered for the WG 92 and WG 98 transmission series. Positioned between the engine flywheel and the transmission input shaft, this OEM genuine part ensures smooth power delivery and dampens torsional vibrations during gear shifts. The SKU 4660.251.033 is specifically designed to maintain driveline integrity, reducing stress on adjacent assemblies such as the 4660198001 PERIPHERALS and the 4660101011 TRANSMISSION HOUSING. Without this coupling, the transmission cannot properly engage with the engine, leading to operational failure.
Symptoms of Failure
- Torque converter shudder during acceleration: A worn 4660.251.033 coupling causes noticeable vibration when shifting from first to second gear, often misdiagnosed as a fluid issue.
- Oil leaks near the bell housing: Degraded seals on the coupling allow transmission fluid to escape, leaving puddles under the vehicle and requiring immediate replacement of the 0634100317 O-RING.
- Intermittent gear slipping under load: As the coupling loses its damping ability, the transmission may momentarily lose power transfer, especially when climbing grades or towing heavy loads.
- Metallic grinding noise at idle: A cracked coupling hub produces a distinct rattling sound, indicating imminent failure of the 4660301018 HOUSING if not addressed.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4660.251.033 |
| Outer Diameter | 295 mm |
| Inner Diameter | 85 mm |
| Thickness | 42 mm |
| Material | Forged steel with nitrile rubber dampener |
| Weight | 3.8 kg |
| OEM Reference | ZF 4660.251.033 |
| Torque Capacity | 1,200 Nm |
Compatibility
This coupling is engineered for ZF’s WG series powershift transmissions, specifically the WG 92 and WG 98 models. It also fits the WG 180 and WG 200 series when used with the appropriate 0501209818 RANGE SELECTOR assembly. For WG 200 series applications, verify the housing clearance using the 4660221012 SUCTION TUBE alignment guide. The part is not backward-compatible with older ZF 4HP or 5HP series without significant modification to the 4660301018 HOUSING.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4660198001 | PERIPHERALS | Manages hydraulic pressure distribution |
| 0501209818 | RANGE SELECTOR | Controls gear ratio engagement |
| 4660101011 | TRANSMISSION HOUSING | Encloses internal gear sets |
| 4660301018 | HOUSING | Supports clutch pack assembly |
| 0631306174 | CYLINDRICAL PIN | Aligns coupling to flywheel |
| 0769123894 | TYPE PLATE | Identifies transmission model |
| 4660221012 | SUCTION TUBE | Transmits fluid to pump |
| 0634100317 | O-RING | Seals coupling-to-housing interface |
| 0636103273 | CAP SCREW | Fastens coupling to input shaft |
| 0750100022 | SCREW PLUG | Closes inspection port |
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