The 20532220 Synchronizer Hub Assembly is engineered for precise speed synchronization and gear engagement alignment in Volvo I-Shift and Mack AMT transmissions. Constructed from carburized, hardened alloy steel, it ensures reliable performance under heavy-duty conditions. This component is critical for smooth gear shifts and reducing wear on transmission internals.

Engineering Function

This assembly synchronizes rotational speeds between gears during shifts, ensuring smooth engagement. Positioned within the transmission’s gear train, it mitigates gear grinding and shifting delays. Failure can lead to incomplete synchronization, resulting in gear grinding, delayed shifts, and increased transmission wear.

System Compatibility

Compatible with both Volvo I-Shift and Mack AMT systems, this synchronizer hub ensures optimal gear engagement across heavy-duty applications.

Vehicle & Transmission Application

Designed for Volvo FH16 Gen 3, FH Gen 2, FMX, Mack Anthem, and Granite models. Fits I-Shift AT2812, AT2612, Mack T309, and Maxitorque 9-speed AMT transmissions.

Interchangeability

This synchronizer hub can be swapped with units sharing identical geometric and torque-handling characteristics. Compatibility is verified through matching flange dimensions and material specifications.

Cross Reference / OEM Numbers

Specifications

• Material: Carburized hardened alloy steel
• Treatment: Case-hardened for surface durability
• Weight: 1.8 kg
• Torque Rating: Supports up to 2500 Nm
• System Fit: Volvo I-Shift, Mack AMT

Failure Modes & Diagnostics

Common failure modes include surface galling and brinelling due to high contact stress. Symptoms manifest as gear grinding or delayed shifts. The root cause is often insufficient lubrication or excessive load.

Commercial Information

MOQ: 1 unit. Lead time: 2–3 weeks. Compliant with ISO 9001 standards. Packaged in protective anti-corrosion wrapping.