ZF 4657.303.020 OUTPUT FLANGE for WG160/WG190/WG210 | OEM Genuine Part

Overview

The ZF 4657.303.020 OUTPUT FLANGE is a critical driveline component engineered for the WG160, WG190, and WG210 series transmissions. 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 differential. Machined from high-strength forged steel, the flange features precision-splined internal teeth that lock onto the output shaft, while its bolt pattern secures the companion flange or yoke. The SKU 4657.303.020 is specifically designed to withstand high cyclic loads and thermal expansion in heavy-duty commercial applications. When installed, this output flange works in concert with the 4656101038: TRANSMISSION HOUSING to maintain proper alignment and sealing of the rear drivetrain assembly.

Symptoms of Failure

• Transmission output shaft oil leak at rear seal: A worn flange surface or damaged sealing lip allows transmission fluid to escape, often visible as drips near the driveshaft connection.
• Vibration during acceleration or deceleration: Excessive wear on the splines or a bent flange face causes driveline imbalance, felt as rhythmic shaking through the chassis.
• Clunking noise when shifting gears: Loose fit between the output flange and shaft splines creates audible backlash, especially during load reversals.
• Driveshaft wobble or premature U-joint failure: A distorted flange pilot bore misaligns the driveshaft, accelerating wear on universal joints and center bearings.

Technical Specifications

Compatibility

This output flange is a direct OEM replacement for ZF WG160, WG190, and WG210 series transmissions. It also fits the WG180 and WG200 models due to shared output shaft spline geometry and bolt patterns. The flange is not compatible with older ZF S-series or Ecomat transmissions. For proper installation, ensure the 4656201075: HOUS.FRONT SECT and 4656201037: HOUSING REAR PART are free of cracks or warping. In some WG210 variants, the 4472239180: HOUSING REAR PART must also be inspected for wear at the flange seating area.

Related Components

Frequently Asked Questions

Q: Can the 4657.303.020 output flange be reused if it shows minor surface rust?
A: No. Even light corrosion on the sealing surface or splines can cause premature seal failure and driveline vibration. Always replace with a new OEM flange to maintain proper torque transfer and oil containment.

Q: What torque specification should be used for the flange retaining bolts?
A: For the cap screws (part 0636100817), tighten to 120 Nm (89 lb-ft) in a star pattern, then apply an additional 90-degree turn. Always use a new fixing plate (4656301148) to lock the bolts.

Q: Is this flange compatible with the ZF WG180 transmission?
A: Yes. The WG180 shares the same output shaft spline count and bolt pattern as the WG160/WG190/WG210 series. Verify that your housing rear part (4656201037 or 4472239180) matches the flange pilot diameter.