Overview
The ZF 4616.308.034 COVER is a critical sealing component designed specifically for the WG 65 series transmission. This OEM genuine part sits on the rear or intermediate housing section, providing a secure barrier that protects internal clutch packs and planetary gear sets from contamination while retaining transmission fluid. As an original ZF-manufactured unit, the SKU 4616.308.034 ensures precise fitment and material integrity that aftermarket alternatives often lack. When installed alongside a TRANSMISSION HOUSING, this cover forms the final boundary of the hydraulic circuit, directly influencing pressure stability and overall gearbox reliability.
Symptoms of Failure
- External oil seepage around the bell housing: A worn or warped cover allows ATF to escape, leaving visible drips on the transmission pan or under the vehicle after extended operation.
- Intermittent gear slipping under load: When the cover loses its seal, hydraulic pressure drops, causing delayed engagement or slipping in higher gears during heavy hauling.
- Contaminated fluid with metallic debris: Cracks in the cover permit dirt ingress, accelerating wear on bearings and clutches, often detected during routine fluid analysis.
- Whining noise from the transmission sump: A loose cover can vibrate against the housing, producing a distinct high-pitched sound that intensifies with RPM changes.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4616.308.034 |
| Material | Die-cast aluminum alloy (A356-T6) |
| Overall Diameter | 180 mm (7.09 in) |
| Overall Height | 45 mm (1.77 in) |
| Flange Thickness | 8 mm (0.31 in) |
| Weight | 0.85 kg (1.87 lbs) |
| OEM Reference | ZF 4616.308.034 |
| Surface Finish | Black anodized with sealing groove |
| Operating Temperature Range | -40°C to +150°C |
Compatibility
This cover is engineered for the ZF WG 65 series, but its mounting pattern and sealing profile also suit several other ZF off-highway transmissions. Compatible models include the WG 65, WG 180, WG 200, and WG 250 series. It is frequently used in wheel loaders, graders, and dump trucks where the transmission housing must withstand high thermal cycling. For a complete assembly, always pair this cover with the correct HEXAGON SCREW (M10x30), HEXAGON SCREW (M12x35), and HEXAGON SCREW (M14x40) to achieve the specified torque values.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616101059 | TRANSMISSION HOUSING | Main structural casing for gear and shaft support |
| 0636011038 | HEXAGON SCREW | M10 fastener for cover-to-housing attachment |
| 0636011118 | HEXAGON SCREW | M12 fastener for high-torque housing joints |
| 0636016015 | HEXAGON SCREW | M14 fastener for structural mounting points |
| 0631306085 | CYLINDRICAL PIN | Alignment dowel for precise cover positioning |
| 0634313118 | O-RING | Primary seal between cover and housing |
| 0636304019 | SCREW PLUG | Drain or fill port closure |
| 0634801152 | SEALING RING | Copper gasket for plug sealing |
| 0732611049 | FILTER INSERT | Hydraulic fluid filtration element |
| 0634303718 | O-RING | Secondary seal for filter housing interface |
