Overview
The ZF 4616.302.131 COVER is a critical sealing component engineered specifically for the WG 65 series transmission. This OEM genuine part encloses the rear section of the gearbox housing, protecting internal rotating assemblies from contamination while maintaining hydraulic pressure integrity. Positioned between the OUTPUT shaft and the OUTPUT FLANGE, this cover ensures precise alignment and leak-free operation under high-torque conditions. The SKU 4616.302.131 is manufactured to ZF’s original specifications, guaranteeing a direct fit without modifications.
Symptoms of Failure
- Transmission fluid seepage at rear housing: A worn or cracked 4616.302.131 cover allows oil to escape around the output shaft, leaving visible drips on the bell housing or ground beneath the vehicle.
- Gear engagement hesitation or slipping: When this cover loses its seal, hydraulic pressure drops, causing delayed clutch pack engagement and erratic shifting under load.
- Contaminated transmission fluid: A compromised cover permits dirt and moisture ingress, leading to dark, gritty oil and accelerated wear on internal components like the TRANSMISSION HOUSING.
- Abnormal noise from rear bearing area: Loss of cover rigidity allows the output shaft bearing to shift, producing a low-frequency rumble or whine during deceleration.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4616.302.131 |
| Material | Die-cast aluminum alloy (EN AC-44300) |
| Outer Diameter | 210 mm |
| Inner Diameter (seal bore) | 85 mm |
| Thickness | 18 mm |
| Weight | 1.45 kg |
| OEM Reference | ZF 4616.302.131 |
| Fastener Torque Spec | 45 Nm (applies to HEXAGON SCREW 0636011038) |
Compatibility
This cover is designed for the ZF WG 65 series, but it also fits select models in the WG180 and WG200 families where the rear housing architecture matches. It is directly compatible with transmissions using a 6-bolt output flange pattern and a 85mm seal bore. Always verify the HEXAGON SCREW 0636011118 and HEXAGON SCREW 0636016015 lengths when retrofitting. The CYLINDRICAL PIN 0631306085 ensures proper alignment during installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616105415 | OUTPUT | Transfers torque from transmission to driveshaft |
| 4616303144 | OUTPUT FLANGE | Connects output shaft to universal joint |
| 4616101094 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 0636011038 | HEXAGON SCREW | Secures cover to housing (M10x30) |
| 0636011118 | HEXAGON SCREW | Fastener for output flange (M12x35) |
| 0636016015 | HEXAGON SCREW | Bolt for bearing retainer (M8x20) |
| 0631306085 | CYLINDRICAL PIN | Alignment dowel for cover positioning |
| 0634313118 | O-RING | Seal between cover and housing |
| 0732611049 | FILTER INSERT | Hydraulic fluid filtration element |
| 0634303718 | O-RING | Seal for output flange bore |
