Overview
The ZF 4644.301.301 HOUSING is a critical structural component engineered for the WG 180 and WG 200 series transmissions. This OEM genuine part encloses the clutch packs and planetary gear sets, providing the rigid framework necessary for precise gear alignment and hydraulic pressure containment. As the central shell of the transmission assembly, the 4644.301.301 housing interfaces directly with the TRANSMISSION HOUSING (4644101142) to form the complete gearbox casing. Its precision-machined bores and sealing surfaces ensure that internal oil galleries remain pressurized, preventing cross-contamination between lubrication circuits. The SKU 4644.301.301 is manufactured to ZF’s exacting tolerances, making it a direct replacement for worn or damaged units in heavy-duty applications.
Symptoms of Failure
When the ZF 4644.301.301 HOUSING begins to degrade, operators often notice oil seepage around the bell housing mating face, a common long-tail search query for WG transmission leaks. Another frequent indicator is intermittent gear slipping under load, caused by housing flex that disrupts clutch piston travel. You may also detect metallic debris in the transmission fluid from bearing race fretting against the housing bore. Finally, difficulty engaging reverse or low gears can signal housing distortion that misaligns the shift rail, a symptom often traced back to this specific part.
Technical Specifications
| Part Number | 4644.301.301 |
| Material | High-grade aluminum alloy (A356-T6) |
| Weight | 8.7 kg (19.2 lbs) |
| Length | 420 mm |
| Width | 310 mm |
| Height | 180 mm |
| OEM Reference | ZF 4644.301.301 |
| Bolt Pattern | 12-point M10 x 1.5 |
Compatibility
This housing is specifically designed for the ZF WG 180 and WG 200 transmission families, including all sub-variants such as the WG180-110, WG180-120, WG200-130, and WG200-140. It also fits select WG 160 series units when used with the appropriate ADAPTER (4475280078). For proper assembly, technicians must pair this housing with the TYPE PLATE (0730365067) for identification and the GROOVED STUD (0631311009) for secure mounting. The COVER PLATE (4644303060) seals the rear access port, completing the assembly.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101142 | TRANSMISSION HOUSING | Main gearbox casing |
| 0730365067 | TYPE PLATE | Identification label |
| 0631311009 | GROOVED STUD | Mounting fastener |
| 4644303060 | COVER PLATE | Rear access seal |
| 4644303061 | COVER PLATE | Side port cover |
| 4475280078 | ADAPTER | Cross-series fitment |
| 4644106306 | SHIFT SYSTEM | Gear selection mechanism |
| 4644306499 | COVER PLATE | Inspection cover |
| 4644159351 | SHIFT SYSTEM | Secondary shift assembly |
| 4644306560 | VALVE BLOCK | Hydraulic control unit |
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