Overview
The ZF 1238.310.016 OUTPUT FLANGE is a critical driveline component engineered for the WG180, WG200, WG201, and WG65 series transmissions. This OEM genuine part serves as the mechanical interface between the transmission output shaft and the vehicle’s drive shaft, transferring rotational torque from the gearset to the wheels. Precision-machined from high-strength alloy steel, the 1238.310.016 flange ensures concentric alignment and vibration-free power delivery. It mounts directly onto the output shaft and is secured within the 4616101101: TRANSMISSION HOUSING, which encloses the entire output assembly. The flange’s splined bore and bolt pattern are designed to match OEM specifications, guaranteeing a zero-tolerance fit that prevents premature wear on adjacent components.
Symptoms of Failure
- Transmission fluid seepage at the output shaft: A worn or cracked output flange allows gear oil to escape past the seal, leaving puddles under the vehicle and reducing lubrication levels inside the 4616301304: HOUSING.
- Driveline vibration during acceleration: When the flange’s splines or bolt holes become elongated, rotational imbalance occurs, causing a rhythmic shudder that intensifies with speed.
- Clunking noise when shifting between drive and reverse: Excessive backlash in the flange-to-shaft connection produces a metallic knock as torque direction changes, often misdiagnosed as a failing universal joint.
- Visible wear on the flange face or splines: Inspecting the part during service reveals galling, pitting, or deformation, indicating imminent failure that can damage the output shaft and the 4616301309: HOUSING.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 1238.310.016 |
| Material | Heat-treated alloy steel (40Cr / 42CrMo4 equivalent) |
| Outer Diameter | 180 mm (approx.) |
| Bolt Circle Diameter | 150 mm (approx.) |
| Spline Count | 14-tooth involute spline |
| Weight | 2.85 kg (6.3 lbs) |
| Surface Treatment | Zinc-nickel plated (corrosion resistant) |
| OEM Reference | ZF 1238.310.016 |
Compatibility
This output flange is specifically designed for ZF’s WG series powershift transmissions. Verified compatible models include the WG180, WG200, WG201, and WG65 series. It is also used in certain variants of the WG150 and WG250 where the output shaft spline geometry matches. The flange interfaces directly with the 0636011118: HEXAGON SCREW fasteners that secure it to the output hub. Always cross-reference your transmission’s serial number with the 1238.310.016 part number to confirm fitment, as housing revisions may alter the bolt pattern.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616101101 | TRANSMISSION HOUSING | Encloses the output shaft and flange assembly |
| 0636011118 | HEXAGON SCREW | Secures the output flange to the shaft hub |
| 4616301304 | HOUSING | Intermediate housing for bearing support |
| 4616301309 | HOUSING | Rear housing section for WG series |
| 0630361069 | SEALING CAP | Prevents debris ingress into the output bore |
| 0636011038 | HEXAGON SCREW | Mounting bolt for housing flanges |
| 0636016015 | HEXAGON SCREW | High-tensile bolt for output flange retention |
| 0631306085 | CYLINDRICAL PIN | Alignment dowel for housing-to-flange positioning |
| 0634313118 | O-RING | Seals the flange-to-housing interface |
| 0636304019 | SCREW PLUG | Closes oil drain or inspection ports |
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