20866605 SP1 Twin Cylinder Compressor for Volvo B9R

What does a twin cylinder compressor do?

This water-cooled twin cylinder compressor serves as a critical component within the air brake system of heavy commercial vehicles, providing the necessary compressed air for braking and pneumatic functions. By utilizing two piston-cylinder assemblies, this unit delivers a higher air output compared to single-cylinder alternatives, ensuring faster reservoir replenishment and consistent pressure for demanding operations.

Compatibility with Volvo B9R engines

This specific model is designed for Volvo B9R trucks equipped with D9B engines. It features a Ø85.00 mm cylinder bore, a 62 mm stroke, and a swept volume of 704cm³. The unit is equipped with an ESS feature and a water-cooled valve plate to maintain thermal stability during sustained high-demand cycles common in heavy-duty transport.

Technical specifications and installation

For correct installation, technicians should verify the water inlet and outlet ports (M16x1.5) and ensure the through-drive configuration matches the existing engine setup. Proper maintenance of the coolant circuit is essential to prevent overheating of the valve plate and ensure long-term operational reliability.

Maintenance and reliability

Check the compatibility list to confirm this unit meets your specific engine requirements.

OE cross-reference

1300 185 002 (Twin Cylinder Compressor) is the equivalent of the Volvo OE number. This part directly replaces Volvo OE number 20866605SP1.