Overview
The ZF 4661.205.009 CLUTCH is a critical friction assembly engineered for the WG 90 and WG 94 series powershift transmissions. This OEM genuine part serves as the primary torque-transfer interface within the planetary gear set, engaging and disengaging hydraulic power flow to specific gear ranges. Positioned directly inside the main transmission housing, the SKU 4661.205.009 works in concert with the 4661101021: TRANSMISSION HOUSING to ensure precise clutch pack alignment and oil distribution. Without this component, the transmission cannot modulate power delivery to the output shaft.
Symptoms of Failure
- Delayed or harsh gear engagement: When the clutch disc friction material wears thin, you will notice a pronounced lag when shifting from neutral to drive or reverse, often accompanied by a jarring thud.
- Transmission overheating under load: A slipping 4661.205.009 generates excessive heat due to constant friction, causing the transmission fluid to darken and emit a burnt odor.
- Intermittent loss of forward or reverse: As the clutch piston seals degrade, hydraulic pressure drops, leading to sporadic gear disengagement during operation—a common long-tail search query for “ZF WG200 clutch slipping.”
- Oil contamination with metallic debris: Worn clutch plates shed fine metal particles into the fluid, which can be detected during routine oil analysis or when draining the sump.
Technical Specifications
| Part Number | 4661.205.009 |
| Type | Friction Clutch Assembly |
| Outer Diameter | 205 mm |
| Inner Diameter | 135 mm |
| Thickness (Stacked) | 42 mm |
| Material | Sintered Bronze on Steel Core |
| Weight | 1.85 kg |
| OEM Reference | ZF 4661.205.009 |
Compatibility
This clutch is specifically designed for ZF WG series powershift transmissions, including the WG 90, WG 94, WG 180, and WG 200 models. It is a direct replacement for units used in construction equipment such as wheel loaders, telehandlers, and industrial forklifts. The 4661.205.009 interfaces with the 4661301047: HOUSING II which contains the clutch piston, and the 4661301093: TUBE that routes cooling oil to the friction surfaces. Additionally, the assembly is secured using the 0631306174: CYLINDRICAL PIN for precise alignment during installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4661101021 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4661301047 | HOUSING II | Clutch piston housing and oil gallery |
| 4661301093 | TUBE | Oil supply conduit for clutch cooling |
| 0631306174 | CYLINDRICAL PIN | Alignment dowel for clutch pack |
| 0769123894 | TYPE PLATE | Identification tag for transmission |
| 0750100022 | SCREW PLUG | Seals oil passages in housing |
| 0636302602 | SCREW PLUG | Drain or fill port plug |
| 0634100633 | O-RING | Hydraulic seal for clutch piston |
| 4661301041 | NOZZLE | Oil spray nozzle for gear lubrication |
| 4661301062 | NOZZLE | Secondary oil jet for clutch pack |
