3966520 Cummins Compatible Single Cylinder Compressor

What does a single cylinder compressor do?

This single cylinder air brake compressor serves as a critical component in the pneumatic braking system, providing the necessary compressed air required for safe vehicle operation. Designed with a robust piston-type structure, it converts engine power into high-pressure air to supply the air processing unit and storage tanks. Its heavy-duty grade materials ensure reliable performance under demanding thermal conditions.

Compatibility and engine fitment

This specific unit is designed to be compatible with Cummins engines. It features a water-cooled design to prevent overheating during continuous operation, which is essential for maintaining consistent pressure in heavy commercial vehicle brake systems. The unit includes an integrated ESS feature and a water-cooled valve plate to enhance overall system longevity.

Installation and maintenance guidance

For installation, technicians should verify the water inlet and outlet ports (3/4" - 16 UNF) and ensure the M27x2 air outlet port is correctly seated. The through-drive configuration requires precise alignment with the engine drive to prevent premature wear of the internal piston and ring assemblies. Regular inspection of the M10x1 unloader port is recommended to ensure proper pressure regulation.

Troubleshooting and system health

Maintaining stable air pressure is vital for braking performance in heavy commercial vehicles. If air pressure builds slowly or if the compressor fails to unload, it may indicate issues with the valve plate or cooling flow. Consult your authorized distributor for further guidance.

OE cross-reference

2500 030 002 (Single Cylinder Compressor) is the equivalent of the Cummins OE number. This part directly replaces Cummins OE number 3966520.