Inspect the compressor housing for cracks or other damage. Inspect the drive gear for cracks or other damage. NOTE: For Wabco branded air compressors, the drive gear can not be removed . If the drive gear is damaged, the air compressor assembly must be replaced. NOTE: For Knorr-Bremse branded air compressors, the drive gear can… Read More »
Remove the cylinder block mounting bracket and mounting fasteners. NOTE: Replacement Knorr-Bremse’ .. air compressors are shipped without an air compressor drive gear. If replacing the air compressor or if the air compressor drive gear is damaged, remove the drive gear from the air compressor. Remove the air compressor drive gear mounting fastener. Use a… Read More »
Remove the air compressor support bracket mounting capscrews. Remove the air compressor support bracket to the cylinder block mounting bracket capscrews. Remove the air compressor support bracket. Remove the air compressor rear gear housing mounting fasteners. Remove the air compressor and mounting gasket. Discard the gasket. Remove the four air compressor support bracket mounting capscrews.… Read More »
• Park the vehicle, apply the parking brakes, and chock the wheels. • Drain the air system. • For systems that do not use an air dryer, a pressure gauge added to the air governor unloader port will aid with the leak test. • Build system pressure to governor cut-out. • With the engine… Read More »
Cummins® engines are equipped with a variety of air compressors, including a two cylinder version. This procedure will cover the removal, cleaning, inspection, and installation of WabcoTM and Knorr-BremseTM brands of air compressor. To determine what brand air compressor a specific engine has, look on the air compressor data plate, usually located on the side… Read More »
Remove the air governor or air governor signal line from the air compressor. Install the pipe plugs into all of the air governor unloader ports on the air compressor. Operate the engine to activate the air compressor. If the air system pressure does not rise, the unloader valve assembly is malfunctioning. Clean the air compressor… Read More »
NOTE: A new gasket kit must be used each time the air compressor cylinder head is removed and installed. Do not reuse the cylinder head mounting capscrews. NOTE: Due to an interference with the fuel pump on some applications, following a specific installation sequence of the air compressor cylinder head and mounting capscrews will make… Read More »
Carefully place a new gasket on the lower section of the cylinder head. Place the upper section of the cylinder head and insert five internal hex capscrews. Tighten the internal hex capscrews. Use the following sequence. NOTE: If installing a new air compressor cylinder head assembly, the following steps should not be performed. New cylinder… Read More »
Air compressor cylinder heads can be rebuilt with new gaskets if air or coolant leaks are detected. Disassemble the cylinder head by removing the five internal hex capscrews. Separate the cylinder head. Remove and discard the old gasket. Inspect the sealing surface on both the upper and lower sections of the cylinder head for damage.… Read More »
NOTE: The below clean and inspect steps are only to be completed if the air compressor cylinder head was removed as part of another repair.The air compressor cylinder head does NOT need to be removed if the unloader and valve assembly are determined to be stuck/ seized. Refer to Procedure 012-003 in Section 12. Inspect… Read More »