Overview
The ZF 4644.301.349 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 train and hydraulic control elements, ensuring precise alignment of internal rotating assemblies under high torque loads. The SKU 4644.301.349 interfaces directly with the DISCONNECTION (4644105475) mechanism and the OUTPUT FLANGE (4642303097) to maintain driveline integrity. Manufactured from high-strength cast alloy, this housing provides the rigid foundation necessary for consistent gear engagement and hydraulic pressure retention in heavy-duty industrial applications.
Symptoms of Failure
- External oil seepage at mating surfaces: When the housing distorts or develops micro-fractures, transmission fluid leaks appear around the bell housing and output flange areas, often accompanied by a burnt smell during operation.
- Abnormal gear engagement noise: A worn housing allows bearing journals to shift, producing a distinct “clunking” or “grinding” sound during shifts, particularly under load in WG 200 series units.
- Vibration through the driveline: Loss of housing rigidity causes misalignment between the TRANSMISSION HOUSING (4644101134) and the output shaft, resulting in low-frequency vibration that intensifies at highway speeds.
- Intermittent gear slipping: Structural flex in the housing alters clutch pack clearance, leading to momentary power loss during torque converter lockup in WG 180 transmissions.
Technical Specifications
| Parameter | Value |
|---|---|
| Material | High-grade cast aluminum alloy (A356-T6) |
| Weight | 14.2 kg (31.3 lbs) |
| Overall Length | 485 mm |
| Mounting Bolt Pattern | 6x M12 on 180 mm PCD |
| OEM Reference | ZF 4644.301.349 |
| Seal Surface Hardness | HRB 85 minimum |
| Operating Temperature Range | -40°C to +120°C |
Compatibility
This housing is engineered for the ZF WG 180 and WG 200 series transmissions, commonly found in municipal trucks, fire apparatus, and heavy construction equipment. It directly replaces OEM part 4644.301.349 in all WG 180 variants (WG 180-1, WG 180-2) and WG 200 models (WG 200-3, WG 200-4). The housing accommodates the HEXAGON SCREW (0636020211) for secure mounting and integrates with the shift system bore. For complete assembly, verify compatibility with the output flange and disconnection unit listed above.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644105475 | DISCONNECTION | Engages/disengages power flow from transmission to PTO |
| 4642303097 | OUTPUT FLANGE | Transfers torque from transmission to driveshaft |
| 0636020211 | HEXAGON SCREW | Secures housing to transmission bell housing |
| 4644101134 | TRANSMISSION HOUSING | Main structural casing for gear train assembly |
| 0730365125 | TYPE PLATE | Identification label with transmission serial number |
| 0631311009 | GROOVED STUD | Alignment dowel for housing positioning |
| 0636305019 | SCREW PLUG | Seals oil passages in housing casting |
| 4644301247 | THREADED BUSH | Reinforced insert for high-stress bolt holes |
| 0634303485 | O-RING | Hydraulic seal between housing and valve body |
| 4644106013 | SHIFT SYSTEM | Hydraulic actuator assembly for gear selection |
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