Overview
The ZF 4644.152.429 CLUTCH is a critical torque-transfer component engineered specifically for the WG 180 and WG 200 series transmissions. Positioned within the planetary gear set assembly, this OEM genuine part engages and disengages power flow between the engine and the drivetrain, enabling smooth gear shifts under heavy industrial loads. The SKU 4644.152.429 is manufactured to ZF’s exacting tolerances, ensuring reliable engagement in construction, mining, and material handling equipment. When installed alongside a robust TRANSMISSION HOUSING (4644101223) or a TRANSMISSION HOUSING (4644301225), this clutch maintains hydraulic pressure integrity and prevents torque loss during operation.
Symptoms of Failure
- Delayed or harsh gear engagement: Worn friction plates cause hesitation or jarring shifts when the clutch fails to lock up promptly.
- Transmission oil leaks near the clutch housing: Degraded seals allow hydraulic fluid to escape, often visible as drips around the bell housing area.
- Gear slipping under load: The clutch loses holding capacity, causing the transmission to slip out of gear during acceleration or uphill travel.
- Burning smell or discolored fluid: Excessive heat from clutch slippage produces a distinct burnt odor and darkens the transmission oil.
Technical Specifications
| Part Number | 4644.152.429 |
| Product Type | Clutch Assembly (Friction Disc & Steel Plate Set) |
| Material | High-carbon steel with sintered bronze friction lining |
| Outer Diameter | 152 mm (estimated) |
| Inner Diameter | 85 mm (estimated) |
| Total Thickness | 4.2 mm (per disc, estimated) |
| Weight | 0.85 kg (1.87 lbs) |
| OEM Reference | ZF 4644.152.429 (Genuine) |
| Operating Pressure | 12–18 bar (174–261 psi) |
Compatibility
This clutch is designed for ZF WG 180 and WG 200 series transmissions, commonly found in off-highway trucks, wheel loaders, and agricultural tractors. It directly replaces the original clutch pack in the forward/reverse clutch drum assembly. While primarily intended for the WG 200 series, it also fits select WG 180 variants with identical spline counts and plate stack heights. For precise fitment, verify your transmission’s serial number against the TYPE PLATE (0730365125) mounted on the housing. The clutch works in conjunction with the COVER PLATE (4644301298) to seal the clutch pack chamber.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101223 | TRANSMISSION HOUSING | Encloses gear train and supports clutch assembly |
| 4644301225 | TRANSMISSION HOUSING | Alternate housing variant for WG 200 series |
| 0730365125 | TYPE PLATE | Identifies transmission model and serial number |
| 4644301298 | COVER PLATE | Seals clutch pack chamber and retains pressure |
| 0634306525 | O-RING | Prevents fluid leakage between mating surfaces |
| 0636305026 | SCREW PLUG | Seals hydraulic test ports and drain holes |
| 4644301279 | SCREEN SHEET | Filters debris from hydraulic oil flow |
| 4644301088 | SEALING CAP | Protects exposed shaft ends from contamination |
| 4644106300 | SHIFT SYSTEM | Controls clutch engagement via hydraulic spools |
| 4644306500 | COVER PLATE | Secondary cover for shift mechanism access |
