85000396 VOLVO FH 12/500 Twin Cylinder, Air Compressor

The technical function of this twin cylinder air compressor is to provide consistent pneumatic pressure to the vehicle's braking system. Designed as a high-strength component, it operates within the air brake subsystem to ensure reliable pressure regulation under heavy-duty operating conditions.

85000396 is the OE-equivalent of the VOLVO 85000396 twin cylinder air compressor used in the VOLVO FH 12/500. This assembly features a Ø85.00 mm cylinder bore and a 62 mm stroke to achieve a swept volume of 704cm³. It is specifically engineered to match the requirements of the D12 engine configuration found in heavy commercial vehicles.

For the workshop technician, this unit features a water-cooled design (W) with a water inlet and outlet port size of M16x1,5. The air inlet port is Ø35 and the air outlet port is M26x1,5. The assembly includes an ESS feature and a water-cooled valve plate to maintain optimal thermal stability during operation. Proper installation should ensure that the M12x1 air unloader port and all water connections are secured to prevent leaks.

Maintenance of the air brake system requires regular checks of the compressor's integration with the engine's cooling circuit. Ensuring the water ports are free from debris and that the through-drive mechanism functions without resistance is vital for long-term service life in heavy-duty transport applications.