Overview
The ZF 4644.151.427 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 manages the engagement and disengagement of specific gear ratios. By precisely controlling hydraulic pressure to lock and release clutch packs, the 4644.151.427 ensures smooth power delivery from the engine to the driveline. This part number, 4644.151.427, is a direct factory replacement, guaranteeing the exact fit and material specifications required for heavy-duty industrial applications. When installed alongside the 4644101180: TRANSMISSION HOUSING, it forms the core of the torque management system.
Symptoms of Failure
When the ZF 4644.151.427 clutch begins to wear, operators often notice specific performance degradation. Common failure indicators include:
- Delayed or harsh gear engagement: The clutch fails to apply or release smoothly, causing a noticeable lag or jolt when shifting between forward and reverse.
- Torque converter shudder under load: A vibration or shudder during acceleration, particularly in lower gears, indicates the clutch is slipping due to worn friction surfaces.
- Low hydraulic pressure warnings: Internal seal degradation within the 4644.151.427 can cause pressure drops, triggering dashboard alerts or transmission fault codes.
- Burning smell from transmission fluid: Overheated clutch material produces a distinct acrid odor, often accompanied by darkened or contaminated oil.
Technical Specifications
| Part Number | 4644.151.427 |
| OEM Reference | ZF 4644.151.427 |
| Material | High-carbon steel hub with sintered bronze friction lining |
| Outer Diameter | 180 mm (estimated) |
| Inner Diameter | 120 mm (estimated) |
| Thickness | 28.5 mm (estimated) |
| Weight | 2.4 kg (5.3 lbs) |
| Operating Pressure | 12–18 bar |
Compatibility
This clutch is specifically designed for ZF’s WG 180 and WG 200 series transmissions, which are widely used in municipal trucks, construction loaders, and agricultural tractors. It is a direct fit for models including WG180, WG200, and their derivative variants (WG180-1, WG200-2). The 4644.151.427 interfaces directly with the 4644301225: TRANSMISSION HOUSING and requires the 0730365067: TYPE PLATE for proper identification during rebuilds. For secure mounting, the 0631311009: GROOVED STUD is used to anchor the assembly. Always verify your transmission serial number against the OEM parts catalog before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101180 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4644301225 | TRANSMISSION HOUSING | Secondary housing for clutch pack support |
| 0730365067 | TYPE PLATE | Identification tag for transmission model |
| 0631311009 | GROOVED STUD | Fastener for housing alignment |
| 4644301298 | COVER PLATE | Seals the clutch access port |
| 0634306525 | O-RING | Hydraulic seal for pressure circuits |
| 0636305026 | SCREW PLUG | Closes fluid drain passages |
| 4644301279 | SCREEN SHEET | Filters debris from hydraulic fluid |
| 4644301088 | SEALING CAP | Protects exposed shaft ends |
| 4644106300 | SHIFT SYSTEM | Controls clutch engagement sequence |
