Overview
The ZF 4642.105.403 DISCONNECTION is a critical OEM genuine component engineered specifically for the WG 200 Series transmission. This part functions as the primary clutch disengagement mechanism, enabling smooth torque interruption during gear shifts and stationary operation. Positioned within the hydraulic control circuit of the transmission, it directly interfaces with the SHIFT SYSTEM to regulate oil flow and pressure. The SKU 4642.105.403 ensures precise actuation, preventing driveline drag and reducing wear on internal planetary gears. Without this disconnection unit, the transmission cannot safely separate engine power from the output shaft, making it indispensable for operational reliability in heavy-duty industrial applications.
Symptoms of Failure
- Delayed or harsh gear engagement: When the 4642.105.403 wears, hydraulic pressure drops, causing noticeable lag or clunking when shifting from neutral to drive or reverse.
- Transmission overheating: A failing disconnection unit allows continuous clutch slippage, generating excessive heat that can trigger warning lights or fluid degradation.
- Oil leaks near the valve body: Internal seal degradation on this part leads to external fluid seepage, often visible around the TRANSMISSION HOUSING mating surfaces.
- Unintended vehicle creep: Inability to fully disengage power causes the vehicle to move slowly even with the transmission in neutral, a clear sign of a compromised disconnection assembly.
Technical Specifications
| Parameter | Specification |
|---|---|
| OEM Part Number | 4642.105.403 |
| Material | Hardened steel with nitrile seals |
| Weight | 1.45 kg (3.2 lbs) |
| Dimensions (L x W x H) | 185 mm x 95 mm x 65 mm |
| Operating Pressure | 12–18 bar |
| Temperature Range | -20°C to +120°C |
| OEM Reference | ZF 4642.105.403 |
Compatibility
This genuine disconnection unit is primarily designed for the ZF WG 200 Series transmissions, including models WG200, WG210, and WG220. It also cross-fits select WG180 variants when used with the appropriate TRANSMISSION HOUSING. The 4642.105.403 is not compatible with older WG150 or WG160 series without significant modifications. For proper identification, always verify the TYPE PLATE on your transmission to confirm model and serial number before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101235 | TRANSMISSION HOUSING | Encloses and protects internal gear sets |
| 4644301310 | TRANSMISSION HOUSING | Alternate housing for WG200 series |
| 0730365067 | TYPE PLATE | Identification plate with model and serial |
| 4644106301 | SHIFT SYSTEM | Controls gear selection and hydraulic flow |
| 4644306507 | COVER PLATE | Seals valve body access port |
| 4644159302 | SHIFT SYSTEM | Secondary shift actuator assembly |
| 4644306560 | VALVE BLOCK | Distributes hydraulic pressure to clutches |
| 4644306408 | WASHER | Sealing and spacing for valve block |
| 4644306513 | COVER | Protective cover for shift mechanism |
| 4644306555 | COVER | Secondary cover for hydraulic passages |
