20478151 SP1 Volvo VHD Twin Cylinder Compressor

What does a twin cylinder compressor do?

This twin cylinder compressor serves as a critical component within the pneumatic braking system of heavy commercial vehicles. Engineered with high-strength components, it provides the necessary air pressure required for reliable braking performance and system actuation. The unit is designed to withstand rigorous operating conditions through its robust construction and efficient cooling design.

Compatible vehicles and engine specifications

This specific model is engineered for use in Volvo VHD trucks equipped with D12 engines. The unit features a water-cooled design (W) with M16x1,5 water inlet and outlet ports, ensuring optimal thermal management during operation. Its technical specifications include an Ø85.00 cylinder bore, a 62 mm stroke, and a 704cm³ swept volume to ensure consistent air delivery.

Installation and maintenance guidance

For proper installation, technicians should verify that the air inlet port (Ø35), air outlet port (M26x1,5), and unloader port (M16x1,5) align with the existing engine mounting. Given the through-drive configuration, ensuring the drive gear matches the engine requirements is essential for preventing premature wear of the internal components.

System troubleshooting and selection

Regular inspection of the water cooling lines and air ports is recommended to maintain peak performance. If air pressure fluctuations occur, check the water-cooled valve plate and unloader valve functionality to ensure system integrity.

OE cross-reference

1300 180 002 (Twin Cylinder Compressor) is the equivalent of the Volvo OE number. This part directly replaces Volvo OE number 20478151SP1.