301.01.0019 Volvo Unloader Valve Equivalent

What does an unloader valve do?

This unloader valve plays a critical role in the pneumatic brake system of heavy commercial vehicles by regulating air pressure levels. It ensures the compressor operates efficiently by releasing air once the target pressure is reached, maintaining stable system performance under heavy-duty conditions.

Compatible Volvo models and engines

This component is specifically engineered for a wide range of Volvo trucks, including the F10, F12, FL10, FL12, N10, N12, NL10, NL12, B10B, B10M, and B12 models. It is also compatible with various engines such as TD70, TD71, TD100, TD101, TD102, TD103, D10A, TD120, TD121, TD122, TD123, and D12A. Additionally, it is fitted to Iveco and Renault Trucks vehicles.

Technical specifications and installation

Technical specifications include M22x1,5 ports for Port 1 and Port 21. The unit is designed with an integrated inflation valve and recycle valve to facilitate smooth pressure transitions. Technicians should verify the cut-out pressure of 8,1 BAR / 0,4 BAR during installation to ensure optimal pneumatic regulation.

Maintenance and system reliability

Regular inspection of the unloader valve can prevent air system leaks and compressor over-pressurization. When replacing this unit in WABCO systems or other heavy-duty pneumatic setups, ensure all ports are clean and connections are secure to maintain long-term reliability.

OE cross-reference

301.01.0019 (Unloader Valve) is the equivalent of the Freightliner, Iveco, Kenworth, Mack, Meritor, Peterbilt, Renault Trucks, Volvo and WABCO OE numbers. This part directly replaces Freightliner OE number TDAS9753034750. It also replaces Iveco OE number 5000877145, Kenworth OE number S9753034750, Mack OE numbers 63009753034750, 8235S9753034750, Meritor OE number S9753034750, Peterbilt OE number S9753034750, Renault Trucks OE number 5010067853, Volvo OE number WAB9753034750 and WABCO OE number 9753034750.