Overview
The ZF 4644.301.194 TRANSMISSION HOUSING is a critical structural component designed specifically for the WG180 series. This OEM genuine part encases the planetary gear sets, valve body, and torque converter assembly, providing the rigid framework required to maintain precise gear alignment under high-torque loads. As the central casing of the transmission, it absorbs operational stress and protects internal lubricants from contamination. The SKU 4644.301.194 is a direct replacement for original factory housings, ensuring bolt-hole alignment and sealing surface integrity. When replacing this housing, it is common to also inspect the 4644101043 TRANSMISSION HOUSING for auxiliary mounting points, as both components share critical sealing interfaces.
Symptoms of Failure
- External oil seepage at mating surfaces: Cracks or warping in the housing cause transmission fluid to weep around the bell housing or pan rail, often leaving puddles after parking.
- Persistent gear engagement noise: A worn housing allows bearing bores to shift, producing a low-frequency hum or grinding sound during acceleration in WG180 units.
- Intermittent gear slipping under load: Distortion of the housing bore reduces clutch pack clearance, leading to delayed shifts or sudden loss of drive power on inclines.
- Contaminated fluid from debris ingress: Fractures in the housing casting allow dirt and moisture to enter, causing premature wear of internal seals and clutches.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4644.301.194 |
| Material | High-grade aluminum alloy (A356-T6) |
| Weight | 14.2 kg (31.3 lbs) |
| Overall Length | 485 mm |
| Overall Width | 320 mm |
| Overall Height | 275 mm |
| Bolt Hole Pattern | 6x M12 on 180 mm PCD |
| OEM Reference | ZF 4644.301.194 |
Compatibility
This housing is engineered for the ZF WG180 series transmissions, commonly found in heavy-duty trucks, construction loaders, and agricultural tractors. It is also compatible with the WG200 and WG160 variants where the bell housing bolt pattern matches. For proper assembly, ensure the 0730365067 TYPE PLATE is affixed to the housing for correct identification. Additionally, the 0631311009 GROOVED STUD is required for securing the housing to the engine block, while the 4644303060 COVER PLATE seals the rear access port. Always verify casting numbers before installation to avoid mismatched dowel pin locations.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101043 | TRANSMISSION HOUSING | Auxiliary housing for PTO mounting |
| 0730365067 | TYPE PLATE | Identification plate for transmission model |
| 0631311009 | GROOVED STUD | Alignment stud for housing-to-engine fitment |
| 4644303060 | COVER PLATE | Rear access cover for valve body inspection |
| 4644303061 | COVER PLATE | Side access cover for filter replacement |
| 0634801098 | SEALING RING | O-ring for housing-to-pump interface |
| 0634801250 | SEALING RING | O-ring for housing-to-converter seal |
| 0636305026 | SCREW PLUG | M18 magnetic drain plug for housing |
| 0636305019 | SCREW PLUG | M16 fill plug with vent hole |
| 0634801165 | SEALING RING | Copper washer for plug sealing |
Authorized ZF Distributor
We are a certified supplier of genuine ZF components.
