02Bendix Charging Treatment and Storage Systems Troubleshoot

MIDWESTWHEEL.COM IOWA MISSOURI DES MOINES 1436 E. Ovid Ave. office 515.265.1491 fax 515.265.4120 parts fax 800.314.4329 parts 800.888.0248 CEDAR RAPIDS 200 50th Ave. S.W. main 319.365.4453 fax 319.365.6327 parts fax 877.706.6085 parts 800.332.5435 DAVENPORT 8502 Northwest Blvd. main 563.322.2671 fax 563.322.5940 parts 800.553.1886 SIOUX CITY 1819 E. 4th St. main 712.252.7969 fax 712.252.6149 parts 800.943.3534 CLEAR LAKE 840 Hwy. 18 W. main 641.357.7101 fax 641.357.8190 parts fax 800.548.9674 parts 800.397.5630 KANSAS CITY 5801 E. Front St. main 816.471.1552 fax 816.471.0813 parts 800.821.7402 TRUCK PARTS SUPER STORE TM March 1, 2019 (02Bendix Charging Treatment and Storage Systems Troubleshooting) Common Tests 1. Air system leakage • • Build system pressure to governor cut-out, wait two (2) minutes for the air dryer purge completion. Note the pressures on the dash gauges, then watch the dash gauges for two (2) minutes. Leakage is not to exceed 2 psi in two (2) minutes for truck, bus, tractor (no trailer). • • If the leakage is NOT OK on the gauges, find and repair the leak(s) in the service and park system. Retest, and if a Bendix ® AD-SP ® system purge air dryer is in use and is still not OK, repair or replace the air dryer. • • If the leakage is OK on the gauges, drain the air from the supply reservoir, remove the drain cock, and install an air gauge. Build the system air pressure in the supply reservoir and note and repair any leaks. 2. Compressor head / discharge line leakage (while system is charging) • • Soap the cover on flex discharge line, if leakage is noted, replace the line. • • Soap the fittings and the compressor head to check for leakage, tighten as needed. 3. Discharge plugged or restricted • • Connect temporary discharge line from compressor discharge port to supply reservoir & re-check the build-up. If the build-up is OK, replace the plugged discharge line. 4. Unloader piston leakage • • Disconnect the governor reservoir line and connect it to shop air pressure that is greater than the governor cut-out pressure. If there’s noticeable leakage, replace the ESS piston(s). 5. Air pressure trapped between the governor and compressor • • Verify safety valve operation then remove or disconnect the governor from compressor & check build-up. • • If build-up is OK, repair or replace the governor or line between the governor and compressor. • • If build-up is NOT OK, repair or replace the compressor. 6. “Blow leakage” at the air dryer exhaust • • Drain all air from the supply reservoir then remove the control air line from air dryer, plug the line and plug the control port in the air dryer. Re-check the build-up. • • If build-up is OK, repair or replace the governor or line between the governor and the air dryer. • • If build-up is NOT OK, and below 32° F, turn the ignition ON and allow the heater to warm the air dryer then check build-up. If NOT OK, remove the wire (connector or terminal) from air dryer. Using a test light, check the wire end or terminal for battery voltage with the vehicle ignition ON. If the voltage is OK, repair or replace the air dryer heater and thermostat. If the voltage is NOT OK, repair or replace the vehicle wire connected to the air dryer. Retest build-up. • • If build-up is still NOT OK or temperature is above 32° F, replace the air dryer purge valve assembly.