301.02.0103.04 Air Treatment Unit Service Kit — Volvo

What does an air processing unit repair kit do?

This repair kit serves as a vital service set for the in-place overhaul of the air treatment unit. Its primary role is to ensure the unit correctly dries, regulates, and distributes compressed air throughout the pneumatic brake system of heavy commercial vehicles. By using high-strength components, it helps maintain the integrity of the entire air processing cycle.

Vehicle and system compatibility

This component is compatible with Volvo and Alexander Dennis vehicles, and it is also fitted to Mack trucks. It is designed to work seamlessly within WABCO systems to provide reliable pressure regulation and air filtration. The kit supports various maintenance needs depending on whether the focus is on the dryer section or the regulator assembly.

Maintenance and installation guidance

Technicians should perform inspections when water accumulates in the system or when pressure thresholds begin to drift. Proper installation of these sealing elements and valve parts is critical to prevent pressure loss between circuits. Regular maintenance of the air processing unit helps prevent system-wide failures in the braking mechanism.

Troubleshooting air system performance

For optimal performance, always check the condition of gaskets and O-rings during every service interval to ensure no air leaks occur within the housing.

OE cross-reference

301.02.0103.04 (Air Processing Unit Repair Kit) is the equivalent of the Alexander Dennis, Volvo and WABCO OE numbers. This part directly replaces Alexander Dennis OE number 6585565. It also replaces Volvo OE number 3918353 and WABCO OE number 4324139292.