Overview
The ZF 4646.301.090 HOUSING is a critical structural component engineered for the WG 250, WG 260, and WG 310 transmission series. This OEM genuine part serves as the primary enclosure that supports the gear train, hydraulic valve body, and torque converter assembly. By maintaining precise alignment of internal shafts and bearings, the housing ensures optimal oil flow and pressure distribution throughout the transmission. The SKU 4646.301.090 is manufactured to ZF’s exacting tolerances, providing a direct bolt-on replacement that restores factory-spec performance. When paired with a new TRANSMISSION HOUSING (4646101040), this component forms the backbone of a fully rebuilt gearbox assembly.
Symptoms of Failure
- External oil seepage at the bell housing joint: A cracked or warped housing often causes fluid to escape around the mating surface, leading to low transmission fluid levels and eventual overheating.
- Abnormal gear engagement noise (whining or grinding): When the housing loses dimensional integrity, bearing bores shift, causing misalignment that produces metallic sounds during shifting.
- Intermittent loss of hydraulic pressure: Internal cracks can disrupt oil galleries, resulting in delayed clutch pack engagement or slipping under load.
- Visible corrosion or pitting on the mounting flange: Exposure to road salt and moisture degrades the aluminum alloy, compromising the seal between the housing and the COVER (4646301240).
Technical Specifications
| Part Number | 4646.301.090 |
| Material | High-grade aluminum alloy (A356-T6) |
| Weight | 8.2 kg (18.1 lbs) |
| Overall Length | 420 mm |
| Overall Width | 310 mm |
| Overall Height | 240 mm |
| Bolt Hole Pattern | 12 x M10 on 280 mm PCD |
| OEM Reference | ZF 4646.301.090 |
Compatibility
This housing is specifically designed for ZF’s WG series powershift transmissions. It is a direct fit for the WG 250, WG 260, and WG 310 models commonly used in construction and agricultural machinery. While primarily intended for these three series, the part may also be compatible with earlier WG 180 and WG 200 variants when used with the appropriate adapter kit. Always verify the casting number on your existing housing before installation. For complete assembly, this housing works in conjunction with the HEXAGON SCREW (0636015304) and CAP SCREW (0636101828) to secure the cover and valve body.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4646101040 | TRANSMISSION HOUSING | Main gearbox casing |
| 4646301240 | COVER | Seals the rear of the housing |
| 0636015304 | HEXAGON SCREW | Fastens housing to bell housing |
| 0636101828 | CAP SCREW | Secures valve body inside housing |
| 4646301102 | COVER SHEET | Gasket between housing and cover |
| 4646301098 | COVER SHEET | Thin shim for alignment adjustment |
| 0730365067 | TYPE PLATE | Identification label for transmission |
| 0631311009 | GROOVED STUD | Locating pin for cover alignment |
| 0636101193 | CAP SCREW | Mounts oil pump to housing |
| 0636010174 | HEXAGON SCREW | Attaches housing to engine block |
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