3944460 Compatible 6BT5.9 Single Cylinder Compressor

What does a single cylinder compressor do?

This single cylinder air brake compressor is a piston-type component designed to produce the compressed air required by the braking system in heavy commercial vehicles. It functions by taking drive from the engine to compress intake air, which is then sent to the air processing unit and subsequently to the air tanks. This unit serves as a critical link in the pneumatic system, where any malfunction directly impacts braking performance and safety.

Engine compatibility and fitment

This specific model is designed for compatibility with Cummins engines, including the 6BT5.9, 6CT8.3, ISB, QSB, and C50 series. It features a water-cooled design to prevent overheating during sustained heavy-duty operation, making it suitable for long-haul and heavy-load applications.

Technical specifications and cooling

Technical specifications include a Ø75.00 mm cylinder bore and a 56 mm stroke, providing a swept volume of 247cm³. The unit is equipped with an M27x2 air outlet port, an M10x1 air unloader port, and 3/4 16UNF water inlet/outlet ports for seamless integration into existing cooling circuits.

Maintenance and inspection guidance

To ensure optimal performance, technicians should inspect the water-cooled valve plate and all connection ports during routine maintenance intervals. Check for any signs of pressure loss or leaks at the M27x2 outlet to maintain system integrity.

OE cross-reference

2500 090 001 (Single Cylinder Compressor) is the equivalent of the Cummins OE number. This part directly replaces Cummins OE number 3944460.