Overview
The ZF 4644.153.477 CLUTCH is a critical torque-transfer component engineered specifically for the WG 180 and WG 200 series transmissions. Positioned within the hydraulic control module, this OEM genuine part engages and disengages the driveline, ensuring smooth power delivery under heavy loads. The SKU 4644.153.477 is precision-machined to ZF’s original tolerances, directly replacing worn units to restore shift quality and prevent drivetrain damage. This clutch works in concert with the 4644101203: TRANSMISSION HOUSING and the 4644301382: TRANSMISSION HOUSING to maintain structural integrity and fluid sealing within the assembly.
Symptoms of Failure
- Delayed or harsh engagement: A worn 4644.153.477 clutch often causes a noticeable lag when shifting from neutral to drive, or produces a jarring engagement under acceleration.
- Torque converter shudder: As the clutch disc loses friction material, operators may feel a vibration or shudder during low-speed maneuvers, especially in WG 200 applications.
- Fluid contamination: Degraded clutch material can shed particles into the transmission fluid, leading to clogged filters and erratic hydraulic pressure. This often accompanies failure of the 0634306198: O-RING or 0634801098: SEALING RING.
- Intermittent gear slippage: When the clutch fails to hold full torque, the transmission may momentarily slip out of gear under load, triggering fault codes in the ECU.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4644.153.477 |
| Type | Multi-disc wet clutch |
| Outer Diameter | 153 mm (estimated) |
| Inner Diameter | 100 mm (estimated) |
| Material | Sintered bronze friction lining on steel core |
| Weight | 0.85 kg (1.87 lbs) |
| OEM Reference | ZF 4644.153.477 |
| Torque Capacity | Up to 600 Nm (estimated) |
Compatibility
This clutch is designed for the ZF WG 180 and WG 200 series transmissions, including the WG 201 variant. It is a direct fit for models equipped with hydraulic shift controls and is commonly used in medium-duty trucks, buses, and off-highway equipment. The 4644.153.477 clutch interfaces with the 4644301189: THREADED BUSH for precise alignment and the 0636302005: SCREW PLUG to secure the hydraulic circuit. Always verify your transmission’s serial number against ZF’s parts catalog before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101203 | TRANSMISSION HOUSING | Encloses and supports the clutch assembly |
| 4644301382 | TRANSMISSION HOUSING | Alternate housing variant for WG 200 |
| 4644301189 | THREADED BUSH | Provides threaded mounting point for clutch pack |
| 0636302005 | SCREW PLUG | Seals hydraulic passages in the clutch circuit |
| 0634306198 | O-RING | Prevents fluid leaks between clutch and housing |
| 0634801098 | SEALING RING | Ensures pressure integrity in the clutch piston |
| 0730365067 | TYPE PLATE | Identification plate for transmission model |
| 0631311009 | GROOVED STUD | Locates and secures clutch pack alignment |
| 4644301161 | COVER PLATE | Protects clutch assembly from debris |
| 0636100621 | HEXAGON SCREW | Fastens cover plate to housing |
