Overview
The ZF 4644.305.023 HOUSING is a critical structural component designed for the WG 180 and WG 200 series transmissions. This OEM genuine part serves as the primary enclosure for the gear set and hydraulic control elements, ensuring precise alignment of internal rotating assemblies. As a load-bearing casing, it absorbs torsional stresses and maintains the integrity of the lubrication circuit. The SKU 4644.305.023 is machined to exact factory tolerances to guarantee a seamless fit when replacing a damaged or worn unit. This housing interfaces directly with the TRANSMISSION HOUSING to form the complete structural shell of the transmission assembly.
Symptoms of Failure
- External oil seepage at mating surfaces: Cracks or warping in the housing can cause transmission fluid to leak from the joint between the housing and the DISCONNECTION unit, leading to low fluid levels and overheating.
- Abnormal gear engagement noise: A compromised housing allows bearing bores to shift out of alignment, producing a distinct whining or grinding sound during gear changes under load.
- Persistent hydraulic pressure loss: Internal fractures within the casting can disrupt oil galleries, causing delayed shifts or slipping in the VALVE BLOCK circuit.
- Vibration at the output shaft: A distorted housing face can misalign the OUTPUT FLANGE, resulting in driveline shudder during acceleration.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4644.305.023 |
| Material | High-grade aluminum alloy (EN AC-44100) |
| Weight | 8.2 kg (18.1 lbs) |
| Overall Length | 485 mm |
| Overall Width | 320 mm |
| Overall Height | 275 mm |
| Bolt Hole Pattern | 12x M12 on 180 mm PCD |
| OEM Reference | ZF 4644.305.023 |
| Sealing Surface Finish | Ra 0.8 µm |
Compatibility
This housing is engineered specifically for the ZF WG 180 and WG 200 series transmissions. It is a direct replacement for units found in heavy-duty commercial vehicles, construction equipment, and marine propulsion systems. The part is compatible with both the standard WG 200 and the high-torque variant WG 200 T. When installing, ensure the HEXAGON SCREW fasteners are torqued to factory specifications to prevent stress fractures. This housing also accommodates the TRANSMISSION HOUSING variant used in earlier WG 180 models.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644105424 | DISCONNECTION | Clutch pack separation unit |
| 4644303538 | OUTPUT FLANGE | Driveshaft connection interface |
| 0636021036 | HEXAGON SCREW | Housing mounting fastener |
| 4644101224 | TRANSMISSION HOUSING | Main structural casing |
| 4644301346 | TRANSMISSION HOUSING | Alternate casing variant |
| 0730365067 | TYPE PLATE | Identification label |
| 4644106300 | SHIFT SYSTEM | Gear selection mechanism |
| 4644306500 | COVER PLATE | Access port seal |
| 4644159311 | SHIFT SYSTEM | Secondary shift actuator |
| 4644306563 | VALVE BLOCK | Hydraulic control manifold |
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