Overview
The ZF 4644.152.491 CLUTCH is a critical torque-transfer component engineered for the WG 180 and WG 200 series transmissions. This OEM genuine part sits within the planetary gear set assembly, where it engages and disengages power flow between the engine and driveline. As a friction-based coupling element, the 4644.152.491 clutch modulates gear shifts and ensures smooth power delivery under heavy industrial loads. When installed alongside the 4644101212 TRANSMISSION HOUSING or the 4644301221 TRANSMISSION HOUSING, this clutch maintains precise alignment within the transmission casing. The SKU 4644.152.491 is laser-etched on the hub for traceability, and its identification is verified against the 0730365067 TYPE PLATE affixed to the unit.
Symptoms of Failure
When the 4644.152.491 clutch wears out, operators typically notice these specific failure modes:
- Delayed engagement or gear slipping under load: Worn friction plates cause the transmission to hesitate before engaging, or it slips out of gear during uphill hauls.
- Erratic shift timing and harsh engagement: The clutch fails to modulate pressure smoothly, resulting in jarring shifts that stress the 0631311009 GROOVED STUD and surrounding hardware.
- Burnt transmission fluid odor: Overheated clutch material contaminates the oil, producing a distinct burnt smell and darkening the fluid.
- Low hydraulic pressure warnings: Internal leakage past worn seals reduces clutch apply pressure, triggering dashboard alerts in modern equipment.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 4644.152.491 |
| Clutch Outer Diameter | 245 mm |
| Friction Plate Count | 6 (steel + organic lining) |
| Material | High-carbon steel hub with sintered bronze friction surface |
| Weight | 4.2 kg (9.3 lbs) |
| Torque Capacity | 1,200 Nm (peak) |
| Operating Temperature Range | -20°C to +120°C |
| OEM Reference | ZF 4644.152.491 (genuine) |
Compatibility
This clutch is specifically designed for the ZF WG 180 and WG 200 series transmissions. It is a direct-fit replacement for all WG 200 variants, including WG 200-6, WG 200-8, and WG 200-10 models. The part also retrofits into earlier WG 180 units with minor housing modifications. For proper installation, verify that the 4644101212 TRANSMISSION HOUSING or 4644301221 TRANSMISSION HOUSING is free of cracks, and that the 0631311009 GROOVED STUD is torqued to factory specifications. Always cross-reference the 0730365067 TYPE PLATE to confirm transmission model compatibility before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101212 | TRANSMISSION HOUSING | Encloses clutch and gear assembly |
| 4644301221 | TRANSMISSION HOUSING | Alternate housing variant for WG 200 |
| 0730365067 | TYPE PLATE | Identification tag for transmission model |
| 0631311009 | GROOVED STUD | Secures clutch pack to housing |
| 4644303060 | COVER PLATE | Seals clutch access port |
| 4644303061 | COVER PLATE | Alternate cover plate variant |
| 4644221031 | SCREEN TUBE | Filters hydraulic fluid to clutch |
| 0634306531 | O-RING | Seals clutch piston bore |
| 0634306525 | O-RING | Alternate seal for clutch housing |
| 0636305026 | SCREW PLUG | Closes hydraulic test port |
