Overview
The ZF 4642.105.006 DISCONNECTION is a critical OEM genuine component engineered specifically for the WG 150 Series transmission. This part serves as the primary mechanical interface that isolates the torque converter from the drivetrain during neutral or park engagement, ensuring smooth power interruption and preventing unintended gear engagement. Positioned within the transmission’s hydraulic control circuit, the disconnection unit directly interfaces with the 4642101109: TRANSMISSION HOUSING and the 4642301205: TRANSMISSION HOUSING to maintain structural integrity under high-torque loads. The SKU 4642.105.006 is precision-machined to ZF’s original specifications, guaranteeing exact fitment and reliable disconnection performance in heavy-duty industrial applications.
Symptoms of Failure
- Intermittent gear slippage during deceleration: A worn disconnection unit fails to fully release hydraulic pressure, causing the transmission to partially engage gears when coasting, leading to erratic shifting and increased wear on clutch packs.
- Audible clunking or grinding when shifting to neutral: As the disconnection mechanism loses its sealing capability, you may hear metallic noises from the valve body area, indicating incomplete hydraulic isolation.
- Oil leaks near the transmission housing interface: Degraded seals within the 4642.105.006 allow transmission fluid to escape, often pooling around the 0730365125: TYPE PLATE mounting area, leading to low fluid levels and potential overheating.
- Delayed engagement from park to drive: A failing disconnection unit causes a noticeable lag (2-4 seconds) when selecting a forward gear, as the hydraulic circuit struggles to re-establish pressure after disconnection.
Technical Specifications
| Part Number | 4642.105.006 |
| OEM Reference | ZF WG150 Series Disconnection Assembly |
| Material | High-strength aluminum alloy with hardened steel valve spool |
| Weight | 1.45 kg (3.2 lbs) |
| Dimensions | 120 mm x 85 mm x 65 mm |
| Operating Pressure | 12-18 bar (174-261 psi) |
| Temperature Range | -20°C to +120°C (-4°F to +248°F) |
| Seal Type | Nitrile rubber O-rings (included) |
Compatibility
This genuine ZF disconnection unit is primarily designed for the WG 150 Series transmission, but its hydraulic and mechanical specifications also support the following ZF models: WG 180, WG 200, and WG 250 series transmissions used in off-highway trucks, wheel loaders, and industrial machinery. It is not compatible with the earlier WG 120 or WG 130 series without adapter modifications. For proper installation, ensure the 0631311009: GROOVED STUD is torqued to factory specifications to prevent misalignment of the disconnection valve body.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4642101109 | TRANSMISSION HOUSING | Main structural casing for gear and shaft assembly |
| 4642301205 | TRANSMISSION HOUSING | Secondary housing for hydraulic control components |
| 0730365125 | TYPE PLATE | Identification plate with serial number and model info |
| 0631311009 | GROOVED STUD | Fastener for securing disconnection valve assembly |
| 4642301168 | SCREEN SHEET | Fine mesh filter for hydraulic fluid debris |
| 4642301169 | SCREEN SHEET | Secondary filter for high-pressure oil circuits |
| 0636100621 | HEXAGON SCREW | Mounting bolt for valve housing attachment |
| 4642301186 | SCREEN SHEET | Low-pressure return line filter element |
| 4644159321 | SHIFT SYSTEM | Complete shift selector and actuator assembly |
| 4644306565 | VALVE HOUSING | Hydraulic manifold for pressure regulation |
