Overview
The ZF 4644.153.485 CLUTCH is a critical torque-transfer component engineered specifically for the WG 180 and WG 200 series transmissions. This OEM genuine part serves as the primary engagement mechanism, connecting the engine’s power output to the transmission input shaft. Positioned within the bell housing assembly, the clutch pack modulates hydraulic pressure to enable smooth gear shifts and load holding. The SKU 4644.153.485 is a direct replacement unit manufactured to ZF’s original tolerances, ensuring that the clutch discs and steel plates maintain correct friction coefficients under high thermal loads. When installed alongside the 4644101043 TRANSMISSION HOUSING or the 4644301194 TRANSMISSION HOUSING, this clutch restores the transmission’s ability to handle rated torque without premature wear.
Symptoms of Failure
- Delayed or harsh engagement: When the 4644.153.485 clutch wears, hydraulic pressure cannot be held consistently, causing a noticeable lag between shifting and actual gear engagement. This is often reported as “ZF WG180 clutch slipping under load.”
- Oil contamination with friction material: Worn clutch plates shed debris into the transmission fluid. Operators may observe dark, metallic particles in the oil pan, leading to “clutch debris in ZF transmission oil” searches.
- Erratic shift quality: A failing clutch causes the transmission to hunt between gears or produce shuddering during acceleration. This symptom is frequently described as “WG200 transmission jerking when shifting.”
- Overheating transmission fluid: Slipping clutches generate excessive heat. If the 0634801098 SEALING RING or 0634801250 SEALING RING also fails, fluid leaks can accelerate thermal damage.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4644.153.485 |
| OEM Reference | ZF 4644.153.485 |
| Outer Diameter | 280 mm (estimated) |
| Inner Diameter | 180 mm (estimated) |
| Material | Sintered bronze friction discs / hardened steel plates |
| Weight | 4.2 kg (9.3 lbs) |
| Torque Capacity | 1,200 Nm (estimated) |
Compatibility
This clutch is designed for the ZF WG 180 and WG 200 series transmissions, which are commonly found in medium-duty trucks, buses, and off-highway equipment. It directly replaces the original clutch pack in models with serial numbers starting after 2010. The part also fits select variants of the WG 150 series when used with the correct 0730365067 TYPE PLATE for identification. For installations requiring additional fastening, the 0631311009 GROOVED STUD is often used to secure the clutch assembly to the input drum. Always verify the clutch stack height against the service manual for your specific transmission serial number.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101043 | TRANSMISSION HOUSING | Encloses the clutch and gear sets |
| 4644301194 | TRANSMISSION HOUSING | Alternate housing for WG 200 variants |
| 0730365067 | TYPE PLATE | Identification tag for transmission model |
| 0631311009 | GROOVED STUD | Fastener for clutch pack retention |
| 4644303060 | COVER PLATE | Seals the clutch housing access port |
| 4644303061 | COVER PLATE | Alternate cover plate for different housing |
| 0634801098 | SEALING RING | Prevents fluid leakage at clutch drum |
| 0634801250 | SEALING RING | Secondary seal for high-pressure circuits |
| 0636305026 | SCREW PLUG | Closes hydraulic test ports |
| 0636305019 | SCREW PLUG | Alternate plug for different thread size |
