Overview
The ZF 4616.308.026 SEALING CAP is a critical OEM genuine component engineered specifically for the WG 65 Series transmission. This precision-molded cap serves as a primary seal at the transmission housing interface, preventing fluid migration and maintaining internal pressure integrity. Positioned on the main casing, the SKU 4616.308.026 works in concert with the TRANSMISSION HOUSING to isolate the gear train from external contaminants. Without this cap, the entire hydraulic circuit becomes vulnerable to pressure loss and debris ingress.
Symptoms of Failure
- Oil leaks around the housing seam: A degraded sealing cap allows transmission fluid to weep past the HEXAGON SCREW mounting points, leaving visible puddles under the vehicle.
- Erratic gear engagement: When the cap loses its seal, air enters the hydraulic system, causing delayed or slipping shifts during load changes.
- Contaminated fluid from external debris: A cracked or brittle cap permits dirt and moisture to bypass the HEXAGON SCREW interfaces, accelerating internal wear.
- Whining or grinding noises: Insufficient sealing pressure leads to cavitation in the pump circuit, producing audible distress from the transmission housing.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4616.308.026 |
| Material | High-temperature NBR (Nitrile Butadiene Rubber) |
| Outer Diameter | 68 mm |
| Inner Diameter | 52 mm |
| Height | 14 mm |
| Weight | 0.035 kg |
| OEM Reference | 4616.308.026 |
| Operating Temperature Range | -40°C to +120°C |
| Hardness (Shore A) | 70 ± 5 |
Compatibility
This sealing cap is designed for the ZF WG 65 Series, but its application extends to several related heavy-duty transmissions. It fits the WG180, WG200, and WG250 models where the housing bore matches the cap’s dimensions. The cap also integrates with the HEXAGON SCREW used in WG 65 final drives. For optimal sealing, always pair this cap with the O-RING (0634313118) and SEALING RING (0634801152) during installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616101059 | TRANSMISSION HOUSING | Main casing for gear assembly |
| 0636011038 | HEXAGON SCREW | Fastener for housing attachment |
| 0636011118 | HEXAGON SCREW | Mounting bolt for cover plates |
| 0636016015 | HEXAGON SCREW | High-torque fastener for final drive |
| 0631306085 | CYLINDRICAL PIN | Alignment dowel for housing |
| 0634313118 | O-RING | Static seal for cap interface |
| 0636304019 | SCREW PLUG | Port closure for hydraulic circuits |
| 0634801152 | SEALING RING | Metal-reinforced gasket for high pressure |
| 0732611049 | FILTER INSERT | Hydraulic fluid filtration element |
| 0634303718 | O-RING | Secondary seal for cap retention |
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