Overview
The ZF 4644.151.438 CLUTCH is a critical internal component designed for the WG 180 and WG 200 series transmissions. This OEM genuine part functions as the primary torque transfer mechanism, engaging and disengaging power flow between the engine and the gearbox. Positioned within the clutch housing assembly, this SKU (4644.151.438) directly interfaces with the 4644105423: DISCONNECTION unit to manage gear shifts under load. Precision engineering ensures that this clutch maintains hydraulic pressure integrity, allowing smooth engagement during start-up and gear changes in heavy-duty industrial applications.
Symptoms of Failure
- Delayed engagement or gear slipping under load: When the 4644.151.438 clutch wears, operators often notice a hesitation before the transmission engages, or the vehicle slips out of gear when climbing gradients. This is a common long-tail search query for “ZF WG200 clutch slipping under load.”
- Oil leaks near the bell housing: Worn seals on this clutch assembly allow transmission fluid to escape, leaving puddles under the drivetrain. Search terms like “ZF 4644.151.438 oil leak” frequently target this symptom.
- Erratic shifting or harsh engagement: A failing clutch causes sudden, jarring shifts as the hydraulic circuit loses pressure. This symptom is often searched as “rough shifting ZF WG180 clutch.”
- Burning smell from transmission area: Excessive friction from a worn clutch plate generates heat and a distinct burnt odor, indicating immediate replacement is necessary.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number (SKU) | 4644.151.438 |
| OEM Reference | ZF 4644.151.438 |
| Material | High-strength steel hub with sintered bronze friction lining |
| Weight | Approx. 4.2 kg (9.3 lbs) |
| Outer Diameter | 180 mm |
| Inner Diameter | 120 mm |
| Thickness | 28 mm |
| Operating Pressure | 12–16 bar |
| Max Torque Capacity | 1,200 Nm |
Compatibility
This genuine ZF 4644.151.438 clutch is engineered for the WG 180 and WG 200 transmission families. It is directly compatible with models including the WG 180, WG 200, WG 200-1, and WG 200-2. The part also integrates seamlessly with the 4644303054: OUTPUT FLANGE and requires the 0636021010: HEXAGON SCREW for secure mounting to the 4644101229: TRANSMISSION HOUSING. Always verify your transmission serial number before ordering to ensure correct fitment.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644105423 | DISCONNECTION | Manages clutch release and engagement |
| 4644303054 | OUTPUT FLANGE | Connects transmission to driveshaft |
| 0636021010 | HEXAGON SCREW | Fastens clutch assembly to housing |
| 4644101229 | TRANSMISSION HOUSING | Encloses clutch and gear sets |
| 4644301227 | TRANSMISSION HOUSING | Alternative housing variant |
| 4475280078 | ADAPTER | Interface between clutch and pump |
| 0730365067 | TYPE PLATE | Identification label for transmission |
| 0631311009 | GROOVED STUD | Alignment pin for clutch pack |
| 4644301298 | COVER PLATE | Protects clutch from debris |
| 0634306525 | O-RING | Seals hydraulic fluid passages |
