Overview
The ZF 4616.303.156 OUTPUT FLANGE is a critical driveline component engineered specifically for the WG 65 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. Constructed from high-strength forged steel, the flange ensures precise alignment and minimal runout under heavy loads. The SKU 4616.303.156 is machined to exact ZF tolerances, guaranteeing a secure spline fit and long service life in demanding industrial applications. It mounts directly to the output shaft and is secured using a 0636011118: HEXAGON SCREW and a 0636011038: HEXAGON SCREW for proper clamping force.
Symptoms of Failure
- Transmission oil leak at the output shaft seal: A worn or cracked output flange allows lubricant to seep past the seal, leaving puddles under the vehicle and reducing fluid levels.
- Driveline vibration during acceleration: When the flange splines wear or the flange becomes distorted, rotational imbalance causes noticeable shaking at highway speeds or under load.
- Clunking noise when shifting gears: Excessive backlash between the output flange and the shaft splines produces a metallic clunk during gear engagement or throttle changes.
- Premature bearing or seal failure: A loose or damaged flange places lateral stress on the output shaft bearing and seal, leading to rapid wear of the 0634313118: O-RING and adjacent components.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4616.303.156 |
| OEM Reference | ZF 4616.303.156 |
| Material | Forged alloy steel, induction-hardened |
| Outer Diameter | ~180 mm |
| Overall Length | ~95 mm |
| Spline Count | 14-tooth internal spline |
| Bolt Hole Pattern | 8 x M12 on 150 mm PCD |
| Weight | ~3.8 kg |
| Surface Finish | Black oxide corrosion protection |
Compatibility
While the 4616.303.156 is primarily designed for the WG 65 Series, its spline geometry and bolt pattern are shared across several ZF heavy-duty transmissions. This output flange is compatible with the WG180, WG200, and WG250 models when used in conjunction with the correct 4616101066: TRANSMISSION HOUSING. It also fits select WG 80 and WG 90 variants that utilize the same output shaft diameter. Always verify the housing configuration—such as the 4616301307: HOUSING or 4616301309: HOUSING—to ensure proper alignment before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616101066 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 0636011118 | HEXAGON SCREW | Secures flange to output shaft |
| 4616301307 | HOUSING | Rear housing section for output assembly |
| 4616301309 | HOUSING | Alternate rear housing variant |
| 0636011038 | HEXAGON SCREW | Fastener for housing mounting |
| 0636016015 | HEXAGON SCREW | High-torque bolt for flange retention |
| 0631306085 | CYLINDRICAL PIN | Alignment pin for housing dowel |
| 0634313118 | O-RING | Seals oil between flange and housing |
| 0636304019 | SCREW PLUG | Closes oil drain or fill port |
| 0634801152 | SEALING RING | Prevents leaks at threaded connections |
