Overview
The ZF 4627.320.002 VALVE BUSH is a precision-engineered hydraulic component designed for the valve body assembly within ZF WG150, WG180, and WG200 series transmissions. This OEM genuine part (SKU: 4627.320.002) acts as a critical guide and sealing surface for the control valve spool, directing oil flow to engage clutches and regulate line pressure. Located inside the TRANSMISSION HOUSING, it ensures precise hydraulic circuit timing. When installed alongside the TRANSMISSION HOUSING, this valve bush maintains the integrity of the shift sequence, preventing cross-port leakage that would otherwise degrade performance in heavy-duty industrial applications.
Symptoms of Failure
- Erratic or delayed gear engagement: A worn valve bush allows hydraulic fluid to bypass the spool, causing sluggish shifts or unexpected neutral conditions during operation.
- Internal transmission oil leaks: Degraded sealing surfaces on the 4627.320.002 can lead to fluid migration between circuits, often detected as low oil levels without external drips.
- Harsh or clunking shifts: When the bush loses its dimensional tolerance, clutch pack application pressure becomes inconsistent, resulting in jarring gear changes under load.
- Overheating transmission fluid: Continuous hydraulic slippage from a worn valve bush generates excess heat, accelerating fluid degradation and reducing overall transmission life.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 4627.320.002 |
| Material | Sintered bronze with PTFE impregnation |
| Inner Diameter | 12.00 mm |
| Outer Diameter | 16.00 mm |
| Length | 28.50 mm |
| Weight | 0.015 kg |
| OEM Reference | ZF 4627.320.002 |
| Hardness | HRB 60-70 |
| Operating Temperature Range | -40°C to +120°C |
Compatibility
This valve bush is engineered for the ZF WG series powershift transmissions. It is directly compatible with the WG150, WG180, and WG200 series, which are commonly found in forklifts, wheel loaders, and industrial tractors. The 4627.320.002 fits into the valve body bore and works in conjunction with the GROOVED STUD for secure retention. It also interfaces with the TYPE PLATE identification system for accurate rebuild verification. For optimal hydraulic sealing, always pair this bush with a new O-RING during installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4642101108 | TRANSMISSION HOUSING | Main structural casing for gear and valve assemblies |
| 4642301208 | TRANSMISSION HOUSING | Alternate housing variant for WG180 series |
| 0730365125 | TYPE PLATE | Identification tag for transmission model and serial number |
| 0631311009 | GROOVED STUD | Fastener for valve body and housing alignment |
| 4642301168 | SCREEN SHEET | Fine mesh filter for hydraulic fluid debris |
| 4642301169 | SCREEN SHEET | Alternative mesh filter for high-flow circuits |
| 0636100621 | HEXAGON SCREW | Mounting bolt for valve body and housing |
| 0630361029 | SEALING CAP | Port plug for test points and pressure taps |
| 4642306254 | ADAPTER | Interface component for auxiliary hydraulic circuits |
| 0634303340 | O-RING | Elastomeric seal for valve bush and bore interface |
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