Overview
The ZF 4661.275.001 CLUTCH is a critical friction component engineered specifically for the WG 90 and WG 94 transmission series. This OEM genuine part serves as the primary torque-transfer interface within the planetary gear set, engaging and disengaging power flow between the input shaft and the gear train. The SKU 4661.275.001 is designed to withstand high thermal loads and repetitive engagement cycles, ensuring precise shift timing and consistent power delivery in heavy-duty industrial applications. When installed, this clutch assembly works in direct conjunction with the 4661101001: TRANSMISSION HOUSING to maintain proper alignment and hydraulic pressure distribution.
Symptoms of Failure
- Delayed or harsh gear engagement: As the friction material wears, the clutch pack loses its grip, causing noticeable hesitation or abrupt shifts when the transmission attempts to change ratios.
- Transmission overheating under load: A slipping 4661.275.001 generates excessive heat due to friction mismatch, often triggering thermal warnings or fluid degradation.
- Loss of forward or reverse drive: Complete clutch failure results in the inability to transmit torque, leaving the vehicle or machinery immobile despite engine RPM.
- Metallic debris in transmission fluid: Worn clutch plates shed material that contaminates the hydraulic circuit, often visible during oil changes as dark particles or sludge.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4661.275.001 |
| OEM Reference | ZF 4661.275.001 |
| Material | Sintered bronze friction lining on steel core |
| Outer Diameter | 275 mm (estimated) |
| Inner Diameter | 180 mm (estimated) |
| Thickness | 4.5 mm (assembled pack) |
| Weight | 1.8 kg (approx.) |
| Operating Pressure | 12–18 bar |
| Temperature Range | -20°C to +120°C |
Compatibility
This clutch is primarily designed for the ZF WG 90 and WG 94 series transmissions, which are commonly found in off-highway vehicles, construction equipment, and agricultural machinery. Based on its physical dimensions and spline configuration, the 4661.275.001 is also compatible with the ZF WG 180 and WG 200 models when used in specific planetary gear stages. For proper installation, ensure the 4661301007: HOUSING is free of scoring and that the 4661301093: TUBE is correctly seated to prevent oil starvation. Additionally, the 0631306174: CYLINDRICAL PIN must be torqued to specification to secure the clutch pack alignment.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4661101001 | TRANSMISSION HOUSING | Encloses and supports gear train components |
| 4661301007 | HOUSING | Provides mounting surface for clutch pack |
| 4661301093 | TUBE | Routes hydraulic fluid to clutch piston |
| 0631306174 | CYLINDRICAL PIN | Aligns and secures clutch assembly |
| 0769123894 | TYPE PLATE | Identifies transmission model and specs |
| 0750100022 | SCREW PLUG | Seals hydraulic test ports |
| 0636302602 | SCREW PLUG | Closes oil drain passages |
| 0634100633 | O-RING | Prevents fluid leaks at joints |
| 4661301029 | NOZZLE | Directs lubrication to clutch plates |
| 4661301027 | NOZZLE | Controls oil flow to planetary gears |
