Overview
The ZF 4616.301.284 COVER is a critical sealing component designed exclusively for the WG 65 series transmission. This OEM genuine part encloses the rear section of the gearbox, protecting internal assemblies from contaminants while maintaining hydraulic pressure. Positioned directly over the output shaft area, this cover works in tandem with the 4616105413: OUTPUT and the 4616203017: OUTPUT FLANGE to ensure a sealed, leak-free drivetrain. The SKU 4616.301.284 is precision-machined to ZF factory tolerances, guaranteeing a direct fit without modification.
Symptoms of Failure
- Oil seepage around the rear bell housing: A worn or cracked cover allows transmission fluid to escape, often visible as dark stains beneath the vehicle or on the transmission casing.
- Contaminated transmission fluid: When the cover fails, dirt and moisture enter through the seal, leading to gritty or milky oil that accelerates internal wear.
- Abnormal gear engagement delays: Loss of hydraulic pressure from a compromised cover can cause sluggish shifting or hesitation when selecting forward or reverse gears.
- Visible cracks or deformation: Thermal cycling or impact damage may cause the cover to warp, resulting in a misaligned fit with the 4616101117: TRANSMISSION HOUSING.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 4616.301.284 |
| Material | Die-cast aluminum alloy (A380 equivalent) |
| Overall Diameter | 285 mm (11.22 in) |
| Overall Height | 65 mm (2.56 in) |
| Wall Thickness | 4.5 mm (0.177 in) |
| Weight | 1.85 kg (4.08 lbs) |
| OEM Reference | ZF 4616.301.284 |
| Sealing Surface Finish | Ra 0.8 µm (32 µin) |
| Operating Temperature Range | -40°C to +120°C (-40°F to +248°F) |
Compatibility
This cover is engineered for the ZF WG 65 series, which includes the WG180, WG200, and WG250 models commonly found in heavy-duty trucks, buses, and off-highway equipment. It is also compatible with select WG 65 variants used in marine propulsion systems. Always verify the housing casting number before installation. For secure mounting, use the 0636011038: HEXAGON SCREW and 0636016015: HEXAGON SCREW to achieve proper torque specifications.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616105413 | OUTPUT | Transfers torque from the transmission to the driveshaft |
| 4616203017 | OUTPUT FLANGE | Connects the output shaft to the driveline yoke |
| 4616101117 | TRANSMISSION HOUSING | Main structural casing that houses all internal gears and shafts |
| 0636011038 | HEXAGON SCREW | Fastener for securing the cover to the housing |
| 0636016015 | HEXAGON SCREW | Secondary fastener for flange attachment points |
| 0631306085 | CYLINDRICAL PIN | Alignment dowel for precise cover positioning |
| 0634313118 | O-RING | Static seal between cover and housing |
| 0732611049 | FILTER INSERT | Internal oil filtration element |
| 0634303718 | O-RING | Secondary seal for output flange interface |
| 0636610082 | STUD | Threaded rod for mounting auxiliary components |
