Overview
The ZF 4644.301.402 TRANSMISSION HOUSING is a critical structural component engineered specifically for the WG 200 series of heavy-duty transmissions, including the WG180, WG200, and WG208 models. This OEM genuine part serves as the main casing that encloses and protects the gear train, clutch packs, and hydraulic valve body from contaminants while maintaining precise alignment of rotating assemblies. The SKU 4644.301.402 is machined to exacting tolerances to ensure proper oil flow channels and mounting points for ancillary components. When replacing this housing, it is common to also inspect and replace the 4644101249: TRANSMISSION HOUSING if damage is found on mating surfaces, as both units share critical sealing interfaces.
Symptoms of Failure
When the ZF 4644.301.402 transmission housing begins to fail, operators typically notice several distinct warning signs that should not be ignored:
- External oil seepage around bell housing bolts: Cracks or porosity in the housing casting allow transmission fluid to escape, often first visible as dark stains near the lower bolt holes.
- Gear engagement hesitation or slipping: A warped housing distorts the alignment of the shift rail and valve body, causing delayed or incomplete clutch pack engagement under load.
- Unusual metallic grinding noises: Bearing bore wear within the housing permits shaft misalignment, leading to gear tooth contact patterns that produce a low-frequency growl during acceleration.
- Contaminated fluid with metallic particles: Internal cracks shed aluminum fragments into the oil circuit, which can be detected during routine fluid analysis or when inspecting the 4644301279: SCREEN SHEET for debris accumulation.
Technical Specifications
| Specification | Value |
|---|---|
| OEM Part Number | 4644.301.402 |
| Material | High-pressure die-cast aluminum alloy (A380) |
| Dry Weight | 14.2 kg (31.3 lbs) |
| Overall Length | 485 mm |
| Overall Width | 320 mm |
| Overall Height | 295 mm |
| Bolt Hole Pattern | 12-point, M10 x 1.5, 120 mm PCD |
| Sealing Surface Roughness | Ra 0.8 µm max |
| Operating Temperature Range | -40°C to +120°C |
| OEM Reference | ZF 4644.301.402 (Genuine) |
Compatibility
This transmission housing is designed for direct fitment on the following ZF power shift transmission models: WG180, WG200, and WG208. These units are commonly found in heavy construction equipment, agricultural tractors, and material handling vehicles. The housing accepts all standard internal components for these series, including the 4644301298: COVER PLATE which seals the rear access port, and the 0634306323: O-RING that prevents fluid migration between the housing and the pump drive adapter. For proper torque retention, the 0636305026: SCREW PLUG should be replaced whenever the housing is removed to ensure leak-free sealing of the drain and fill ports.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101249 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4644301298 | COVER PLATE | Seals rear access opening |
| 0634306323 | O-RING | Fluid seal between housing and adapter |
| 0636305026 | SCREW PLUG | Drain/fill port sealing |
| 4644301279 | SCREEN SHEET | Filters debris from oil circuit |
| 4644301088 | SEALING CAP | Protects unused ports from contamination |
| 4644159347 | SHIFT SYSTEM | Controls gear selection mechanism |
| 4475280036 | SCREW-IN SLEEVE | Provides threaded insert for sensor mounting |
| 4644306511 | GEAR SHIFT HOUSING | Encloses shift fork assembly |
| 4644306440 | PISTON | Hydraulic actuator for clutch packs |
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