Overview
The ZF 4644.306.284 VALVE HOUSING is a precision-machined hydraulic control component that directs oil flow within the WG100, WG150, WG180, WG200, and WG201 series transmissions. This OEM genuine part houses the valve spools and springs that regulate clutch engagement and gear shifts. Installed directly onto the main TRANSMISSION HOUSING (4642101109) or the TRANSMISSION HOUSING (4642301205), the SKU 4644.306.284 ensures correct hydraulic pressure distribution for smooth power delivery under heavy loads. Without this valve housing, the transmission cannot modulate line pressure or execute shift timing.
Symptoms of Failure
- External hydraulic oil leaks around the valve body mating surface – Worn gaskets or cracked housing bores cause fluid seepage, leading to low pressure and eventual gear slipping.
- Erratic or delayed shifting under load – Internal bore wear prevents valve spools from moving freely, resulting in harsh engagements or failure to shift from first to second gear.
- Transmission overheating due to improper oil circulation – A distorted valve housing restricts flow to the cooler circuit, causing elevated sump temperatures and accelerated clutch wear.
- Neutral creep or unintended vehicle movement in park – Damaged valve landings fail to seal off pressure, allowing torque converter drain-back and partial clutch application.
Technical Specifications
| Part Number | 4644.306.284 |
| OEM Reference | ZF 4644 306 284 |
| Material | High-strength aluminum alloy (EN AC-42100) |
| Weight | 2.85 kg (6.28 lbs) |
| Length | 312 mm |
| Width | 148 mm |
| Height | 92 mm |
| Bolt Hole Pattern | 6x M10 on 95 mm centers |
| Sealing Surface | Ground flatness ≤ 0.05 mm |
Compatibility
This valve housing is engineered for ZF WG-series powershift transmissions used in construction, mining, and material handling equipment. Confirmed fitment includes the WG100, WG150, WG180, WG200, and WG201 models. It also retrofits into certain WG 202 variants when paired with the correct TYPE PLATE (0730365125) for identification. Always verify the GROOVED STUD (0631311009) alignment during installation to prevent cross-threading into the transmission case.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4642101109 | TRANSMISSION HOUSING | Main structural case for gear train |
| 4642301205 | TRANSMISSION HOUSING | Alternate housing for WG180/200 |
| 0730365125 | TYPE PLATE | Identification tag for model verification |
| 0631311009 | GROOVED STUD | Alignment dowel for valve housing |
| 4642301168 | SCREEN SHEET | Fine mesh filter for oil intake |
| 4642301169 | SCREEN SHEET | Coarse debris screen for sump |
| 0636100621 | HEXAGON SCREW | M10 mounting bolt for housing |
| 4642301186 | SCREEN SHEET | Secondary filter for valve body |
| 4644106231 | SHIFT SYSTEM | Complete shift lever assembly |
| 4644306470 | GASKET | Sealing gasket for valve housing |
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