02Bendix Charging Treatment and Storage Systems Troubleshoot

Complaints Common to the Charging & Air Supply System Complaint: Can Not Build System Pressure Compressor head / discharge line leakage (See Common Test 2) Discharge line is plugged or restricted (See Common Test 3) Unloader piston leakage (See Common Test 4) Air pressure is trapped between the governor and the compressor unloaders (See Common Test 5) “Blow leakage” at the air dryer exhaust (See Common Test 6) Complaint: Air System Builds Too Slow Compressor head / discharge line leakage (See Common Test 2) Discharge line is restricted (See Common Test 2) Air is leaking at the air dryer exhaust (See Common Test 6) Compressor head gasket failure • • Apply a soap solution around the cylinder head. If air leakage between the head and block is noted, repair or replace compressor. Air pressure trapped between the governor and compressor unloaders (See Common Test 5) Air system leakage (See Common Test 1) Complaint: Can Not Build System Pressure Above “X” psi. “Blow leakage” at the compressor unloaders • • Remove all hardware from the compressor inlet, then remove the governor. With 120 psi of shop air applied to the compressor unloader port, listen for air leakage at the inlet. If noted, repair the leak or replace the compressor. Caution! To prevent system damage, the ignition switch must be turned off manually if the system pressure reaches 130 psi. Incorrect setting on governor • • Verify the safety valve operation. Drain air from the system, remove or disconnect the governor from the compressor and install a gauge in the governor unloader (UNL) port. Build system pressure and note when the pressure on the dash gauge and the test gauge are equal. They should be equal at the maximum setting of the governor. Discharge line leakage (See Common Test 2) Note: The Bendix ® AD-IS ® air dryer must have pressure supplied from the compressor greater than its pressure protection setting to deliver air pressure to the system. Air system leakage (See Common Test 1) Compressor head gasket failure • • Apply a soap solution around the cylinder head. If air leakage between the head and the block is noted, repair or replace the compressor. • • “Blow leakage” at the air dryer exhaust during charge cycle (See Common Test 6) (See Common Tests on back page)