Overview
The ZF 4616.305.022 COVER is a critical sealing and structural component engineered specifically for the WG 65 series transmission. This OEM genuine part sits on the rear or intermediate housing section of the gearbox, providing a secure barrier that protects internal clutches, planetary gears, and hydraulic circuits from contamination and pressure loss. As an integral element of the transmission assembly, the cover works in conjunction with the TRANSMISSION HOUSING to maintain oil integrity and mechanical alignment. The SKU 4616.305.022 is precision-machined to ZF factory tolerances, ensuring a direct fit without modification.
Symptoms of Failure
- Oil seepage around the cover mating surface: When the 4616.305.022 cover warps or its sealing face degrades, transmission fluid begins to weep externally, leaving visible drips under the vehicle or machinery.
- Erratic gear engagement or slipping: A compromised cover can reduce hydraulic pressure within the valve body, leading to delayed shifts or clutch slip during load changes.
- Contaminated transmission fluid: Cracks in the cover allow dirt and moisture to enter the oil circuit, causing premature wear on bearings and friction plates.
- Increased operating noise: Loss of structural rigidity from a fatigued cover permits vibration and gear rattle, especially during acceleration or deceleration.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4616.305.022 |
| Material | Die-cast aluminum alloy (EN AC-44100) |
| Overall Diameter | 210 mm (8.27 in) |
| Thickness | 18 mm (0.71 in) |
| Weight | 1.2 kg (2.65 lbs) |
| OEM Reference | ZF 4616.305.022 |
| Sealing Surface Finish | Ra 0.8 μm |
| Operating Temperature Range | -40°C to +120°C |
Compatibility
This cover is designed for the ZF WG 65 series, which includes models such as WG65, WG120, WG150, WG180, and WG200. It is commonly found in off-highway vehicles, construction equipment, and heavy-duty trucks where the WG transmission family is deployed. The part interfaces directly with the HEXAGON SCREW (M10 x 30) for secure fastening, and additional mounting points require the HEXAGON SCREW (M12 x 35) and HEXAGON SCREW (M14 x 40) for proper torque distribution. Always verify your transmission serial number against ZF documentation to confirm fitment.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616101059 | TRANSMISSION HOUSING | Main structural casing for gear sets |
| 0636011038 | HEXAGON SCREW | M10 fastener for cover attachment |
| 0636011118 | HEXAGON SCREW | M12 fastener for housing joints |
| 0636016015 | HEXAGON SCREW | M14 fastener for high-torque points |
| 0631306085 | CYLINDRICAL PIN | Alignment dowel for cover positioning |
| 0634313118 | O-RING | Seal between cover and housing |
| 0636304019 | SCREW PLUG | Drain or fill port closure |
| 0634801152 | SEALING RING | Copper washer for plug sealing |
| 0732611049 | FILTER INSERT | Internal oil filtration element |
| 0634303718 | O-RING | Secondary seal for filter housing |
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