Overview
The ZF 4644.152.477 CLUTCH is a critical torque-transfer component engineered specifically 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 the drivetrain. Designed to handle high-torque industrial applications, the clutch assembly (SKU: 4644.152.477) ensures smooth shifting and reliable power delivery under heavy loads. When paired with a robust TRANSMISSION HOUSING, this clutch maintains precise alignment and hydraulic pressure integrity throughout the transmission’s service life.
Symptoms of Failure
- Delayed or harsh gear engagement: As the clutch pack wears, operators may notice a lag when shifting from neutral to drive or reverse, often accompanied by a jarring engagement. This is a common symptom of reduced friction material thickness.
- Transmission overheating under load: A failing 4644.152.477 clutch can cause excessive slippage, generating abnormal heat that triggers warning lights or reduces system efficiency during heavy-duty cycles.
- Loss of power during acceleration: Worn clutch plates fail to lock up completely, resulting in engine RPM spikes without corresponding vehicle speed increase—a classic sign of clutch pack degradation.
- Metallic debris in transmission fluid: When the clutch material begins to disintegrate, fine metallic particles contaminate the hydraulic circuit, often visible during routine oil changes or filter inspections.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4644.152.477 |
| Type | Multi-disc wet clutch assembly |
| Outer Diameter | Approx. 180 mm |
| Inner Diameter | Approx. 120 mm |
| Friction Material | Sintered bronze on steel core |
| Weight | 2.8 kg (6.2 lbs) |
| OEM Reference | ZF 4644.152.477 |
| Operating Pressure | 12–18 bar |
Compatibility
This clutch is designed for the ZF WG 180 and WG 200 series transmissions, commonly found in municipal trucks, construction vehicles, and heavy-duty off-road equipment. It directly replaces the original clutch pack in models such as the WG 180-2, WG 180-3, WG 200-2, and WG 200-3. The part integrates with the HOUSING assembly and requires proper identification via the TYPE PLATE for accurate model verification. Secure mounting is achieved using the GROOVED STUD to maintain alignment during high-torque operation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101080 | TRANSMISSION HOUSING | Encloses and supports the gear train and clutch assembly |
| 4644301333 | HOUSING | Secondary housing component for hydraulic valve body |
| 0730365125 | TYPE PLATE | Identification plate for transmission model and serial number |
| 0631311009 | GROOVED STUD | Alignment stud for clutch pack positioning |
| 0636305019 | SCREW PLUG | Seals hydraulic passages in the housing |
| 4644301247 | THREADED BUSH | Provides threaded mounting point for sensors |
| 0634303485 | O-RING | Hydraulic seal between clutch drum and piston |
| 4644106231 | SHIFT SYSTEM | Controls clutch engagement via hydraulic pressure |
| 4644306470 | GASKET | Prevents fluid leakage between mating surfaces |
| 4644306194 | COVER PLATE | Protects clutch pack from external contaminants |
