02Bendix Charging Treatment and Storage Systems Troubleshoot Charging, Treatment and Storage Systems Troubleshooting Twin Cylinder Compressor Dash Gauge Standard Single Check Valve Governor Standard Single Check Valve (Used with Integral Purge Air Dryers) Air Dryer Safety Valve Dash Gauge Single Check/Protection Valve (Used Only With System Purge Air Dryers) Governor Standard Single Check Valve Air Dryer Safety Valve Supply Rear Supp l y Front Low Pressure Indicator Drain Valve Supply Rear Front Conventional Supply System & System Purge Air Dryer Dash Gauge Standard Single Check Valve Standard Single Check Valve Air Dryer Safety Valve Supply Rear Supp l y Front Low Pressure Indicator Drain Valve Dash Gauge Governor Air Dryer Rear Front Low Pressure Indicator Twin Cylinder Compressor Twin Cylinder Compressor Twin Cylinder Compressor Low Pressure Indicator Conventional Supply System & Integral Purge Air Dryer Two Reservoir Supply System & Bendix ® AD-IS ® Air Dryer Conventional Supply System & Bendix ® AD-9si ® Air Dryer Check Valves Not Required Twin Cylinder Compressor Dash Gauge Standard Single Check Valve G vernor Standard Singl Check Valve (Used with Integral Purge Air Dryers) Air Dryer Safety Valve Dash Gauge Singl Check/Pr tection Valve (Used Only With System Purge Air Dryers) G vernor Standard Single Check Valve Air Dryer Safety Valve Supply Rear Supp l y Front Low Pr ssure Indicator Drain Valve Supply Rear Front Co ve tional Supply System & System Purge Ai D yer Dash Gauge Standard Single Check Valve Standard Single Check Valve Air Dryer Safety Valve Supply Rear Supp l y Front Low Pr ssure Indicator Drain Valve Dash Gauge G vernor Air Dryer Rear Front Low Pr ssure Indicator Twin Cylinder Compressor Twin Cylinder Compressor Twin Cylinder Compressor Low Pr ssure Indicator Co ve tional Supply System & Integral Purge Ai D yer Two Rese voir Supply System & Bendix ® AD-IS ® Ai D yer Co ve tional Supply System & Bendix ® AD-9s ® Ai D yer Check Valves Not R quired Twin Cylinder Compressor Dash Gauge Standard Single Ch ck Valv Governor Standard Single Check Valve (Used with Integral Purge Air Dryers) Air Dryer Safety Valve Dash Gauge Single Check/Protection Valve (Used Only With System Purge Air Dryers) Governor Standard Single Check Valve Air Dryer Safety Valve Supply Rear Supp l y Front Low Pressure Indicator Drai Valve Supply Rear Front Conventional Supply System & System Purge Air Dryer Dash Gauge Standard Single Check Valve Standard Single Check Valve Air Dryer Safety Valve Supply Rear Supp l y Front Low Pressure Indicator Drai Valve Dash Gauge Governor Air Dryer Rear Front Low Pressure Indicator Twin Cylinder Compressor Twin Cylinder Compressor Twin Cylinder Compressor Low Pressure Indicator Conventional Supply System & Integral Purge Air Dryer Two Reservoir Supply System & Bendix ® AD-IS ® Air Dryer Conventional Supply System & Bendix ® AD-9si ® Air Dryer Check Valves Not Required Twin Cylinder Compressor Dash Gauge Standard Single Check Valve Govern r Standard Single Ch ck Valve (Used with Integral Purge Air Dryers) Air Dryer Safety Valve Dash Gauge Single Check/Protection Valve (Used Only With System Purge Air Dryers) Govern r Standard Single Check Valve Air Dryer Safety Valve Supply Rear Supp l y Front Low Pressur Indicator Drain Valve Supply Rear Front Conve tio al Supply System & System Purge Air D ye Dash Gauge Standard Single Check Valve Standard Single Check Valve Air Dryer Safety Valve Supply Rear Supp l y Front Low Pressur Indicator Drain Valve Dash Gauge Govern r Air Dryer Rear Front Low Pressur Indicator Twin Cylinder Compressor Twin Cylinder Compressor Twin Cylinder Compressor Low Pressur Indicator Conve tio al Supply System & Integral Purge Air D ye Two Reservoi Supply System & Bendix ® AD-IS ® Air D ye Conve tio al Supply System & Bendix ® AD-9si ® A r D ye Check Valves Not Requir d CATALOG NUMBER 02 www.midwestwheel.com Order NLINE ™ www.midwestwheel.com Order NLINE ™ TECH Tips Made with FlippingBook RkJQdWJsaXNoZXIy MTEyNjY3NA== 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) Made with FlippingBook RkJQdWJsaXNoZXIy MTEyNjY3NA== 02Bendix Charging Treatment and Storage Systems Troubleshoot Complaint: Air Dryer Cycles “ON & OFF” Constantly This complaint is caused by leakage - either service system or supply system. Service system leakage is shown on dash gauges. Supply (wet tank) system leakage is not. Note: System purge air dryers may purge more often than those with an integral purge volume. Air system leakage (See Common Test 1) Supply system component leakage Drain the system, install a gauge and a shop air hose in place of the drain cock in the supply reservoir. Fill the system to 120 psi, shut off the shop air and check for leakage on the following components in the order presented. Compressor unloader • • Drain the system, remove the governor from the compressor, plug the governor UNL port and re-test. If the leakage is OK, repair compressor unloader mechanism or replace compressor. If the leakage is NOT OK, then continue. (See Common Test 4) Holset ECON valve (used with Holset Type “E & QE” compressors) • • Check for missing, malfunctioning or leaking ECON valve. If a Bendix DI (Drop-In) with a soft seat purge valve air dryer is installed, the ECON valve is not required. • • Is ECON valve required, but missing? If YES, install it and a special Holset check valve with choke. If NO, and ECON valve is present, replace the ECON valve and special check valve. If NO, and an ECON valve is not required, then continue. Air dryer • • Check for leakage. • • Remove the line from the air dryer inlet and - with 120 psi in the supply reservoir - soap the exhaust and inlet port of the air dryer. If the leakage is greater than one (1) inch bubble in one (1) second at the exhaust port, repair or replace the check valve (on dryers with integral purge volume) or replace the body assembly on system purge air dryers. If the compressor is a Holset type E or QE, verify the air dryer in use contains a soft seat purge valve. If the leakage is greater than one (1) inch bubble in one (1) second at the inlet port, repair or replace the purge valve assembly (on dryers with integral purge volume) or replace the turbo cut-off valve on system purge air dryers. Complaint: System Pressure Goes to 150+ psi • • Drain the air system to 0 psi; remove and disconnect the governor from the compressor. Start the engine and note the air pressure rise on dash gauges. Apply 120 psi shop air to compressor unloader port. If air pressure continues to rise, repair the compressor unloaders or replace the compressor. If the air pressure ceases to rise, repair or replace the governor. Complaint: Low Pressure Warning After Only 1 or 2 Brake Applications Brakes out of adjustment • • Adjust the brakes. • • Ensure proper operation of the tractor protection valve. Excessive system leakage on service (application) side of system • • Build the system pressure to governor cut-out and shut off the engine. With the park brakes released, make a full service application and note the dash gauges for two (2) minutes. The pressure drop on either gauge should not exceed 4 psi. (2 psi per min.) If the pressure drop is excessive, find the leakage in the service system. If it’s OK, then continue. Incorrect low pressure switch in use or setting incorrect • • Build the system pressure to governor cut-out. With the engine OFF and ignition ON, slowly drain the air pressure from one service reservoir. The low pressure warning will come on at minimum 60 psi, the recommended maximum is 10-15 psi less than the governor cut-in pressure. Made with FlippingBook RkJQdWJsaXNoZXIy MTEyNjY3NA==