Overview
The ZF 0501.317.123 OUTPUT FLANGE is a critical driveline component engineered for the WG180 series transmission. This OEM genuine part serves as the mechanical interface between the transmission output shaft and the propeller shaft, transferring rotational torque from the gearbox to the vehicle’s drive axle. Machined from high-strength forged steel, the flange ensures precise alignment and vibration-free power delivery. The SKU 0501.317.123 is a direct replacement for original equipment, guaranteeing factory tolerances and material hardness. It mounts directly onto the output shaft, secured by the 0631311009: GROOVED STUD, and is sealed against the 4644101208: TRANSMISSION HOUSING to maintain internal lubrication integrity.
Symptoms of Failure
- Transmission fluid seepage at the rear seal: A worn output flange often develops micro-cracks or spline wear, allowing oil to bypass the seal and drip from the bell housing area.
- Vibration or driveline shudder during acceleration: When the flange’s pilot bore or bolt pattern becomes distorted, it creates rotational imbalance that transmits through the driveshaft.
- Clunking noise when shifting between drive and reverse: Excessive backlash from a stripped or worn spline engagement produces audible metallic impacts under load.
- Premature bearing failure in the output section: A loose or misaligned flange places lateral stress on the output shaft bearings, leading to growling noises and eventual seizure.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 0501.317.123 |
| Material | Forged 42CrMo4 Alloy Steel |
| Surface Treatment | Zinc-Nickel Plating (Corrosion Resistant) |
| Overall Diameter | 165 mm |
| Pilot Bore Diameter | 35 mm |
| Bolt Hole PCD | 130 mm (4 holes) |
| Weight | 2.8 kg |
| OEM Reference | ZF 0501.317.123 |
| Torque Spec | 120 Nm (M12 bolts) |
Compatibility
This output flange is primarily designed for the ZF WG180 series, but it also fits select variants of the WG200 and WG150 transmissions where the output shaft spline count and pilot diameter match. It is commonly found in medium-duty trucks, municipal buses, and off-highway equipment. For proper installation, always verify the condition of the 4644301333: HOUSING and replace the 0730365125: TYPE PLATE if the transmission identification is missing. The flange interfaces directly with the shift system components inside the 4644101208: TRANSMISSION HOUSING.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101208 | TRANSMISSION HOUSING | Main structural casing for gear sets |
| 4644301333 | HOUSING | Rear housing section supporting output shaft |
| 0730365125 | TYPE PLATE | Identification tag with transmission specs |
| 0631311009 | GROOVED STUD | Fastener securing flange to shaft |
| 0636305019 | SCREW PLUG | Seals oil passages in housing |
| 4644301247 | THREADED BUSH | Reinforced insert for bolt threads |
| 0634303485 | O-RING | Seals flange-to-housing joint |
| 4644301257 | ADAPTER | Interface for alternate driveline yokes |
| 0634306023 | O-RING | Secondary seal for output cover |
| 4644106231 | SHIFT SYSTEM | Pneumatic/hydraulic shift actuator assembly |
