Overview
The ZF 4642.306.089 ORIFICE is a precision-machined hydraulic flow restrictor designed for the valve body assembly in ZF WG series transmissions, including the WG100, WG150, and WG180 models. This OEM genuine part (SKU: 4642.306.089) regulates oil pressure and flow rate to critical clutch packs and shift valves, ensuring smooth gear engagement and consistent lubrication. Installed within the transmission housing, it works in tandem with the TRANSMISSION HOUSING to maintain hydraulic stability under heavy loads.
Symptoms of Failure
- Erratic or delayed shifting: A worn or clogged orifice disrupts hydraulic pressure, causing hesitation between gears or harsh engagement.
- Oil leaks around the valve body: Degraded sealing at the orifice interface can lead to fluid seepage, often accompanied by low transmission fluid levels.
- Transmission overheating: Restricted oil flow reduces cooling capacity, resulting in elevated operating temperatures and potential clutch slip.
- Intermittent gear slipping under load: When the orifice fails to maintain proper backpressure, the transmission may lose torque transfer during acceleration or uphill driving.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4642.306.089 |
| Material | Hardened steel with corrosion-resistant coating |
| Outer Diameter | 12.5 mm |
| Length | 18.0 mm |
| Orifice Diameter | 1.2 mm |
| Weight | 8 g |
| OEM Reference | ZF 4642.306.089 |
| Thread Type | M10 x 1.0 |
Compatibility
This orifice is engineered for the following ZF transmission series: WG65, WG100, WG150, WG180, WG181, WG200, and WG201. It is a direct replacement for units equipped with hydraulic valve bodies requiring precise flow control. When replacing this part, always inspect the OUTPUT shaft and OUTPUT FLANGE for wear, as debris from a failing orifice can damage downstream components. Secure the assembly using a HEXAGON SCREW torqued to manufacturer specifications.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616105413 | OUTPUT | Transfers torque from transmission to driveshaft |
| 4616203017 | OUTPUT FLANGE | Connects output shaft to universal joint |
| 4616101117 | TRANSMISSION HOUSING | Encloses gear train and hydraulic system |
| 0636011038 | HEXAGON SCREW | Fastens valve body to housing |
| 0636016015 | HEXAGON SCREW | Secures oil pan and filter assembly |
| 0631306085 | CYLINDRICAL PIN | Aligns valve body components |
| 0634313118 | O-RING | Seals hydraulic passages |
| 0732611049 | FILTER INSERT | Traps debris in oil circuit |
| 0634303718 | O-RING | Prevents external fluid leaks |
| 0636610082 | STUD | Mounts transmission to bellhousing |
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