70330056 SP1 Volvo B9L D9B Twin Cylinder Compressor

This twin cylinder compressor serves as a critical component in the air brake system of heavy commercial vehicles, utilizing two piston-cylinder assemblies to provide high-volume air output. By delivering two compression strokes per crankshaft revolution, this unit ensures that air reservoirs are filled rapidly to maintain consistent braking performance. The water-cooled design helps maintain thermal stability during sustained high demand or long hauls, making it highly reliable under heavy-duty operating conditions.

This specific unit is compatible with Volvo B9L trucks equipped with D9B engines. It is engineered to meet the requirements of the vehicle's pneumatic system, ensuring seamless integration with the engine's cooling circuit via the M16x1,5 water ports. The compressor features a through-drive configuration and an integrated unloader port (M12x1,5) to manage system pressure effectively.

For proper installation, technicians should verify that the water inlet and outlet connections match the existing engine cooling lines. Given the water-cooled valve plate and high-strength components, ensuring clean coolant flow is essential for preventing overheating. We recommend checking all port seals and mounting points to prevent air or coolant leaks during operation.

When replacing a unit, always compare the drive gear and mounting flange against the original part to ensure a perfect fit. This unit is specifically designed to match the performance requirements of Volvo B9L diesel engines.

What is a Twin Cylinder Compressor? A twin cylinder compressor is an engine-driven unit in the air brake system of heavy commercial vehicles that generates compressed air using two piston-cylinder assemblies.

OE cross-reference

1300 185 002 (Twin Cylinder Compressor) is the equivalent of the Volvo OE number. This part directly replaces Volvo OE number 70330056SP1.