Overview
The ZF 4642.306.161 VALVE HOUSING is a precision-machined hydraulic control component that directs oil flow within the WG180 and WG200 transmission series. This OEM genuine part serves as the central manifold for regulating clutch pressure and shift timing, directly influencing gear engagement quality. The SKU 4642.306.161 mounts between the main TRANSMISSION HOUSING and the valve body assembly, channeling pressurized fluid through calibrated passages to actuate planetary gear sets. Its internal bore tolerances are critical for maintaining consistent hydraulic response during load shifts in construction and material handling equipment.
Symptoms of Failure
- Erratic shift timing or gear slipping under load — Worn valve housing bores allow fluid bypass, causing delayed clutch pack engagement. This is especially noticeable when the transmission struggles to hold gear on inclines.
- External oil leaks near the transmission housing interface — Cracks or porosity in the 4642.306.161 casting can develop over time, leading to visible drips around the HOUSING mating surface.
- Contaminated hydraulic fluid with metallic debris — Internal spool wear generates aluminum or steel particles that circulate through the system, accelerating damage to downstream components like the SHIFT SYSTEM.
- Intermittent neutral condition or failure to engage forward/reverse — A compromised valve housing can cause pressure loss to specific clutch circuits, leaving the transmission in a default neutral state during operation.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4642.306.161 |
| Material | High-pressure die-cast aluminum alloy (EN AC-46000) |
| Weight | 2.85 kg (6.28 lbs) |
| Overall Dimensions | 245 mm x 145 mm x 85 mm |
| Bore Diameter Tolerance | H7 (0.025 mm max deviation) |
| Operating Pressure Range | 8–18 bar (116–261 psi) |
| OEM Reference | ZF 4642.306.161 |
| Sealing Surface Finish | Ra 0.8 µm max |
Compatibility
This valve housing is engineered specifically for ZF WG180 and WG200 powershift transmissions used in wheel loaders, telehandlers, and industrial tractors. It directly replaces the original factory component in all WG180 series (WG180, WG180-2, WG180-3) and WG200 series (WG200, WG200-2) models. The part interfaces with the GROOVED STUD alignment dowels and requires the TYPE PLATE to be transferred from the old unit for proper identification. Verify your transmission serial number against ZF documentation to confirm fitment, as minor casting revisions exist between early and late production runs.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101080 | TRANSMISSION HOUSING | Main structural casing that encloses gear sets and supports the valve housing |
| 4644301333 | HOUSING | Secondary housing component for clutch drum assembly |
| 0730365125 | TYPE PLATE | Identification tag with transmission model and serial number |
| 0631311009 | GROOVED STUD | Alignment dowel for precise valve housing positioning |
| 0636305019 | SCREW PLUG | Seals hydraulic test ports in the valve housing |
| 4644301247 | THREADED BUSH | Wear-resistant insert for high-pressure oil passages |
| 0634303485 | O-RING | Static seal between valve housing and transmission housing |
| 4644106055 | SHIFT SYSTEM | Electro-hydraulic actuator assembly for gear selection |
| 4642306050 | COVER PLATE | Protective cover for valve housing access port |
| 4644306464 | GASKET | Pre-cut sealing layer for valve housing mounting surface |
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