Overview
The ZF 4661.273.001 CLUTCH is a critical torque-transfer component engineered specifically for the WG 90 and WG 94 series transmissions. This OEM genuine part sits within the planetary gear set assembly, where it engages and disengages power flow between the input shaft and the output shaft. The SKU 4661.273.001 is a direct replacement for the factory-installed clutch pack, ensuring precise hydraulic actuation and consistent clamping force under heavy-duty industrial loads. When paired with a properly sealed 4661101004: TRANSMISSION HOUSING, this clutch maintains the oil pressure integrity required for smooth gear changes in ZF’s WG series.
Symptoms of Failure
- Delayed engagement or gear slipping under load: Worn friction plates in the 4661.273.001 cause the transmission to hesitate before moving, particularly when shifting from neutral to drive in WG 94 units.
- Erratic shift quality and shuddering: As the clutch pack loses its coefficient of friction, operators report a noticeable vibration or “chatter” during acceleration, often accompanied by irregular shift timing.
- Overheating transmission fluid with burnt odor: A failing clutch generates excessive heat due to internal slippage, leading to dark, acrid-smelling oil and potential damage to the 4661301004: HOUSING.
- Oil leaks near the bell housing area: Hydraulic pressure loss from a degraded clutch piston seal forces fluid past the 0631306174: CYLINDRICAL PIN and into the bell housing, leaving visible drips.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4661.273.001 |
| OEM Reference | ZF 4661.273.001 |
| Material | Sintered bronze friction plates with steel separator discs |
| Outer Diameter | 273 mm |
| Inner Diameter | 180 mm |
| Total Thickness (pack) | 42 mm |
| Weight | 4.8 kg |
| Operating Pressure | 12–16 bar |
| Max Torque Capacity | 2,800 Nm |
Compatibility
This clutch is engineered for the ZF WG series powershift transmissions, with primary application in the WG 90 and WG 94 models. It also fits select variants of the WG 180 and WG 200 series when used in combination with the correct 4661301093: TUBE for oil feed alignment. The 4661.273.001 is not backward-compatible with older WG 80 or WG 120 units without modification to the clutch drum. Always verify the spline count and stack height against your transmission’s service manual before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4661101004 | TRANSMISSION HOUSING | Encloses the clutch pack and supports bearing alignment |
| 4661301004 | HOUSING | Provides structural mounting for the output shaft assembly |
| 4661301093 | TUBE | Routes hydraulic oil to the clutch piston chamber |
| 0631306174 | CYLINDRICAL PIN | Secures clutch drum alignment within the housing |
| 0769123894 | TYPE PLATE | Identifies transmission model and serial number |
| 0750100022 | SCREW PLUG | Seals hydraulic test ports on the valve body |
| 0636302602 | SCREW PLUG | Closes oil drain passages in the sump area |
| 0634100633 | O-RING | Prevents fluid bypass around the clutch piston |
| 4661301029 | NOZZLE | Directs cooling oil to the clutch friction surfaces |
| 4661301027 | NOZZLE | Supplies lubrication to the planetary gear bearings |
