BENDIX BW2764 User's Manual
Contents
1. Start the engine and charge the air brake system again Turn the engine off Note The pressure protection valves in the Bendix AD IS air dryer help protect the air brake system in the event that one circuit leaks If the pressure protection valves are functioning properly and one circuit leaks the other circuit will not drain below 70 psi To verify that the pressure protection valves are working properly perform steps 7 through 9 in the Pressure Protection Valve Test to the right The pressure protection valves are not serviceable and if found to be not functioning properly the AD IS air dryer must be replaced Bendix AD IS Air Dryer System Pressure Protection Valve Test 7 Air Dryer System Locate and manually drain a reservoir While this reservoir is being drained the other reservoir will start to lose pressure but must stop showing a pressure drop when the pressure is above 70 psi If this reservoir continues to show a drop in pressure below 70 psi the pressure protection valve located in the AD IS air dryer is determined to be not functioning properly therefore the AD IS air dryer must be replaced Note Although it is not required a check valve may be located in the supply line of the secondary reservoir If a check valve is in the supply line to the reservoir this reservoir will remain at full system approximately 130 psi pressure when the other reservoir is manually drained To properly test the pressure prot2. Field Inspection WARNING Be sure to follow all the General Safety Guidelines outlined in the Bendix AD IS Service Data Sheet SD 08 2418 before performing any service on the air brake system Chock the vehicle wheels Start the engine and charge the air brake system to governor cut out around 30 psi The primary or secondary air gauge should start to rise As the pressure in one gauge reaches 10 psi it may stop and the other gauge will start to rise As the second gauge reaches 10 psi both gauges will begin to climb to 130 140 psi due to the inaccuracy of the gauges and stop The air dryer will then purge Note that at the end of the purge cycle if the air dryer exhibits fluttering perform the unloader leakage test on the compressor per the manufacturers guidelines before continuing Shut off the engine and push in the yellow button to release the parking brakes Note that the gauges will drop a small amount Check the air gauges If either gauge indicates a continued loss of pressure check the system for leaks Apply and hold the service brakes by fully depressing the brake pedal the gauges will drop a small amount and again check for a loss of pressure by watching both gauges If either gauge indicates a continued loss of air pressure check the system for leaks Release the service brakes Continue to apply and release the service brakes until the pressure drops below governor cut in approximately 100 psi
3. ection valve the reservoir check valve must be removed Note If check valves are installed in both the primary and secondary reservoirs there must be at least one 600 in minimum volume reservoir without a check valve connected to one of the four pressure protection valves in the AD IS air dryer Start the engine and charge the air brake system again Turn the engine off Repeat steps 7 and 8 manually draining the other not previously drained manually reservoir If a pressure protection valve is found to be not functioning properly when testing either reservoir the AD IS air dryer must be replaced If additional information is needed see Bendix AD IS Air Dryer Service Data Sheet SD 08 24 1 8 Bendix AD IS Primary Reservoir Possible Single Check Valve Secondary Reservoir not required AD IS Air Dryer Compressor To Accessories m BW2764 2010 Bendix Commercial Vehicle Systems LLC a member of the Knorr Bremse Group All Rights Reserved 8 10 amp Printed on recycled paper
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