ZF 4657.303.025 OUTPUT FLANGE for WG190/WG210 | OEM Genuine Part

Overview

The ZF 4657.303.025 OUTPUT FLANGE is a critical driveline component engineered specifically for the 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 axle system. Constructed from high-strength forged steel, the flange ensures precise alignment and vibration-free power delivery under heavy-duty operating conditions. The SKU 4657.303.025 is machined to exact OEM tolerances, guaranteeing a seamless fit with the TRANSMISSION HOUSING and the HOUS.FRONT SECT assembly. Without this flange, the transmission cannot deliver power to the wheels, making it a non-negotiable element in any rebuild or overhaul.

Symptoms of Failure

When the ZF 4657.303.025 OUTPUT FLANGE begins to wear, operators will notice distinct performance issues. Look for these specific failure indicators to catch problems early:

• Transmission oil leak at the output shaft seal: A worn flange bore or damaged sealing surface allows transmission fluid to escape, often seen as drips under the bell housing.
• Driveline vibration during acceleration: Excessive runout or spline wear causes a rhythmic shudder that intensifies under load, indicating the flange is no longer concentric.
• Clunking noise when shifting between forward and reverse: Backlash in the flange splines creates a metallic impact sound, signaling imminent failure of the output connection.
• Premature wear of the CYLINDRICAL PIN and retaining hardware: A loose flange accelerates fatigue on adjacent fasteners, leading to further driveline instability.

Technical Specifications

Compatibility

This output flange is designed for the ZF WG190 and WG210 series transmissions, which are commonly found in medium-duty trucks, buses, and off-highway equipment. Based on the flange’s spline geometry and bolt pattern, it is also compatible with the WG180 and WG200 models when used with the correct HOUSING REAR PART. Always verify the transmission serial number before installation, as variations exist between early and late production units. The flange interfaces directly with the output shaft and the CAP SCREW fasteners that secure it to the hub.

Related Components

Frequently Asked Questions

Q: Can the 4657.303.025 flange be reused during a transmission rebuild?
A: Reuse is not recommended. The flange’s sealing surface and splines wear over time, and reusing it often leads to oil leaks or driveline vibration. Always install a new OEM genuine part for reliable service life.

Q: What torque specification should I use for the retaining cap screws?
A: For the CAP SCREW fasteners securing this flange, ZF specifies 95 Nm (70 lb-ft) with a 30-degree angle-tightening step. Always consult the service manual for your specific transmission model.

Q: Will this flange fit a ZF WG180 transmission?
A: Yes, the 4657.303.025 is compatible with WG180, WG190, WG200, and WG210 series when paired with the correct HOUSING REAR PART. Verify your output shaft spline count to confirm fitment.