Overview
The ZF 4644.301.227 TRANSMISSION HOUSING is the primary structural casing for the WG200 series gearbox. This OEM genuine part encloses the planetary gear sets, clutch packs, and valve body, providing precise alignment and protection against contaminants. As the central load-bearing component, it absorbs torsional stresses and maintains oil circulation paths. The SKU 4644.301.227 is engineered to ZF’s original specifications, ensuring a direct bolt-on replacement without modifications. When installed alongside a 4644105423 DISCONNECTION assembly, it forms the core of the transmission’s power flow architecture.
Symptoms of Failure
- Persistent oil seepage at mating surfaces: A cracked or warped housing allows transmission fluid to escape, often visible as drips near the bell housing or output flange area.
- Abnormal gear engagement noise: Worn bearing bores within the housing cause misalignment, producing a distinct whining or grinding sound during shifts.
- Intermittent gear slipping under load: Internal cracks can distort clutch pack clearances, leading to delayed or incomplete torque transfer.
- Contaminated fluid from debris ingress: A compromised housing seal permits dirt and moisture entry, accelerating internal wear.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4644.301.227 |
| Material | Die-cast aluminum alloy (A356-T6) |
| Weight | 18.7 kg (41.2 lbs) |
| Overall Length | 485 mm |
| Overall Width | 320 mm |
| Overall Height | 295 mm |
| Bolt Hole Pattern | 8x M12 on 180 mm PCD |
| OEM Reference | ZF 4644.301.227 |
| Seal Surface Finish | Ra 0.8 µm |
Compatibility
This housing is specifically designed for the ZF WG200 series, including WG180, WG200, and WG210 variants. It directly replaces OEM housings in 6-speed powershift transmissions used in construction and agricultural machinery. The casting accommodates both the 4644303054 OUTPUT FLANGE and the 4644101229 TRANSMISSION HOUSING for dual-casing configurations. Secure mounting requires 0636021010 HEXAGON SCREW fasteners at specified torque values.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644105423 | DISCONNECTION | Clutch pack separation mechanism |
| 4644303054 | OUTPUT FLANGE | Torque transfer to driveline |
| 0636021010 | HEXAGON SCREW | Housing fastening hardware |
| 4644101229 | TRANSMISSION HOUSING | Secondary casing section |
| 4475280078 | ADAPTER | Engine-to-transmission interface |
| 0730365067 | TYPE PLATE | Identification and serial marking |
| 0631311009 | GROOVED STUD | Alignment dowel for assembly |
| 4644301298 | COVER PLATE | Access port sealing |
| 0634306525 | O-RING | Fluid seal between components |
| 0636305026 | SCREW PLUG | Drain/fill port closure |
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