Overview
The ZF 4646.309.013 OUTPUT FLANGE is a critical driveline component engineered specifically for the WG250 series transmission. This OEM genuine part serves as the mechanical interface between the transmission output shaft and the driveshaft, transferring rotational torque from the gearbox to the vehicle’s axles. Machined from high-strength forged steel, the output flange ensures precise alignment and secure coupling under heavy load conditions. The SKU 4646.309.013 is a direct replacement for the original factory-installed flange, maintaining the exact spline count and bolt pattern required for proper engagement within the WG250 assembly.
Symptoms of Failure
When the ZF 4646.309.013 output flange begins to wear, operators may notice several distinct failure indicators. Transmission fluid leakage around the output shaft seal is a common early symptom, often caused by a worn flange surface or damaged sealing lip. Vibration or driveline shudder during acceleration can occur if the flange splines become stripped or the mounting face develops runout. Unusual clunking noises when shifting between forward and reverse typically indicate excessive play between the flange and the output shaft. Driveshaft bolt loosening or breakage may result from flange distortion, leading to potential driveline separation if not addressed promptly.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 4646.309.013 |
| Material | Forged Alloy Steel (42CrMo4) |
| Overall Diameter | 180 mm (7.09 in) |
| Overall Length | 95 mm (3.74 in) |
| Bolt Hole Pattern | 8 x M12 on 150 mm PCD |
| Spline Count | 24 internal splines |
| Weight | 3.8 kg (8.4 lbs) |
| OEM Reference | ZF 4646.309.013 |
| Surface Treatment | Phosphate coating with oil dip |
Compatibility
This output flange is primarily designed for the ZF WG250 series transmission, but it also shares dimensional compatibility with several other ZF off-highway models. The 4646.309.013 flange can be installed on WG180, WG200, and WG240 transmissions that utilize the same output shaft spline geometry and bolt pattern. For WG250 applications, this flange is typically paired with the 4646101028 TRANSMISSION HOUSING and the 4646301095 HOUSING to form the rear output assembly. The 4646301087 COVER protects the internal components, while 0636015304 HEXAGON SCREW fasteners secure the flange to the output shaft hub. Always verify the spline count and pilot diameter against your specific transmission serial number before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4646101028 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4646301095 | HOUSING | Rear output housing support |
| 4646301087 | COVER | Protective cover for output area |
| 0636015304 | HEXAGON SCREW | Flange mounting fastener |
| 0636101828 | CAP SCREW | Housing bolt |
| 4646301102 | COVER SHEET | Inspection cover gasket |
| 4646301098 | COVER SHEET | Output cover seal plate |
| 0730365125 | TYPE PLATE | Identification tag |
| 0631311009 | GROOVED STUD | Alignment dowel for housing |
| 0636101193 | CAP SCREW | Cover mounting screw |
