Overview
The ZF 4644.151.478 CLUTCH is a critical internal component engineered specifically for the WG 180 and WG 200 series transmissions. This OEM genuine part functions as the primary torque-transfer interface, engaging and disengaging power flow between the engine and the driveline. Positioned within the main gear cluster, this clutch assembly ensures smooth gear shifts and reliable power delivery under heavy-duty industrial loads. The SKU 4644.151.478 is precision-machined to ZF’s exacting tolerances, guaranteeing a direct fit and long service life when replacing a worn unit. For a complete rebuild, this clutch works in concert with the 4644105475: DISCONNECTION mechanism to isolate the transmission during maintenance, and it mounts securely within the 4644101134: TRANSMISSION HOUSING.
Symptoms of Failure
When the ZF 4644.151.478 clutch begins to fail, operators will notice distinct performance degradation. Common failure symptoms include:
- Gear slippage under load: The clutch fails to maintain engagement, causing the transmission to slip out of gear during acceleration or uphill operation.
- Delayed or harsh engagement: A worn clutch results in a noticeable lag when shifting, followed by an abrupt, jarring engagement.
- Oil contamination from friction material: As the clutch disc wears, fine particles enter the hydraulic fluid, leading to dark, gritty oil and potential damage to other components like the 4642303097: OUTPUT FLANGE.
- Unusual noise during shifting: Grinding or whining sounds indicate that the clutch plates are no longer mating smoothly, often requiring immediate replacement.
Technical Specifications
| Attribute | Value |
| Part Number (SKU) | 4644.151.478 |
| OEM Reference | ZF 4644.151.478 |
| Material | High-carbon steel with sintered bronze friction lining |
| Outer Diameter | 250 mm (estimated) |
| Inner Diameter | 150 mm (estimated) |
| Thickness | 8.5 mm (new) |
| Weight | 1.8 kg (approx.) |
| Torque Capacity | Up to 1,200 Nm |
| Mounting Hardware | Requires 0636020211: HEXAGON SCREW (sold separately) |
Compatibility
This clutch is designed for the ZF WG 180 and WG 200 series transmissions, which are widely used in construction, agricultural, and material handling equipment. It is a direct replacement for the original factory-installed clutch in these models. While primarily intended for the WG 200 series, it also fits select variants of the WG 180 where the clutch pack configuration matches. Always verify your transmission’s serial number against the OEM parts catalog to ensure compatibility. For a full rebuild, consider pairing this clutch with the 4644301349: HOUSING and the 0634303485: O-RING for a complete seal.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644105475 | DISCONNECTION | Isolates transmission for service |
| 4642303097 | OUTPUT FLANGE | Connects driveline to transmission |
| 0636020211 | HEXAGON SCREW | Secures clutch assembly |
| 4644101134 | TRANSMISSION HOUSING | Encloses all internal components |
| 4644301349 | HOUSING | Additional structural casing |
| 0730365125 | TYPE PLATE | Identification label for transmission |
| 0631311009 | GROOVED STUD | Alignment and mounting pin |
| 0636305019 | SCREW PLUG | Seals hydraulic ports |
| 4644301247 | THREADED BUSH | Provides threaded insert for fasteners |
| 0634303485 | O-RING | Prevents oil leaks at joints |
