BENDIX AD-SP, Manual

Page 1: ...unction of the AD SP System Purge Air Dryer is to collect and remove air system contaminants in solid liquid and vapor form before they enter the brake system It provides clean dry air to the componen...

Page 2: ...ck valve on its way to the delivery port it is also conducted to the purge control mechanism The purge control mechanism is able to monitor air brake system pressure as well as supply air pressure FIG...

Page 3: ...SOR PURGE RELIEF VALVE FRONT RESERVOIR SC PR VALVE REAR RESERVOIR ENGINE TURBO EXHAUST PORT SUPPLY PORT PURGE ORIFICE The air dryer will remain in the charge cycle until the air brake system pressure...

Page 4: ...cut off valve piston to move and close With the turbo cut off valve piston seated closed position air in the discharge line and AD SP air dryer inlet port is prevented from entering the air dryer PUR...

Page 5: ...valve and a pressure protection valve in a single assembly Its primary use is in conjunction with the Bendix AD SP air dryer and is installed in the front axle secondary service reservoir in place of...

Page 6: ...warranty policy before performing any intrusive maintenance procedures An extended warranty may be voided if intrusive maintenance is performed during this period Because no two vehicles operate under...

Page 7: ...ith a plug installed in the delivery port 0 psi in the control port and 120 psi applied to the supply port apply a soap solution to the purge exhaust port If leakage exceeds a 1 bubble in 5 seconds re...

Page 8: ...COVER RETAINING RING HEATER THERMOSTAT ASSEMBLY CONNECTOR RETAINING RING RETAINING RING CAP PISTON O RINGS CONTROL PORT 5 Check the operation of the heater and thermostat assembly in the body during...

Page 9: ...t a hose or line containing pressure it may whip Never remove a component or plug unless you are certain all system pressure has been depleted 8 Use only genuine Bendix replacement parts components an...

Page 10: ...r of the body 2 Using a clean rag wipe the body bores clean 3 Inspect for physical damage to the body casting broken and or missing parts 4 Inspect the interior and exterior of the body for severe cor...

Page 11: ...ntified during disassembly If the fittings were removed from the body use a thread sealant making certain none enters the body during re installation 3 Apply a dielectric grease on the heater and ther...

Page 12: ...temsLLC VEHICLE PREPARATION 1 Park the vehicle on a level surface and prevent movement by means other than the brakes 2 Locate the front axle service secondary reservoir in preparation for installing...

Page 13: ...2 13 UNC bolt must be between 1 8 below to 1 4 above the surface of theAD SP air dryer mounting bracket surface when fully installed and tightened to 50 pound feet Damage to the dryer body will result...

Page 14: ...e 13 CONNECTING THE AIR LINES Important General Instructions The instructions that follow apply to all installations of the AD SP air dryer regardless of whether the AD SP air dryer is replacing an ex...

Page 15: ...ion of the supply and front axle secondary reservoir air pressure to purge or dry the desiccant material During the Purge cycle an approximately 8 14 psi drop in air pressure will be noted on the fron...

Page 16: ...ssive system leakage IMPORTANT Note whether air pressure loss is shown on dash gauge s Pressure loss shown on gauges is caused by service brake system or component leakage Pressure loss NOT SHOWN on g...

Page 17: ...n either test repair or replace governor 4 Test compressor unloader leakage Drain all air pressure from system and remove the governor from the compressor Temporarily plug the governor unloader port o...

Page 18: ...AD SP air dryer F High air usage Vehicle application 2 Water and or Oil in Supply or Service Reservoir A Improper discharge line length or improper line material Maximum air dryer inlet temperature i...

Page 19: ...e operation the air compressor must remain unloaded for a minimum of 30 seconds This minimum purge time is required to ensure complete regeneration of the desiccant material If the purge time is consi...

Page 20: ...ine fittings gaskets filter bodies etc Repair inlet components as needed Note Dirt ingestion will damage compressor and is not covered under warranty If you found excessive oil present in the service...

Page 21: ...ion C Governor malfunction D Air flow to the supply reservoir restricted E Excessive pressure pulsations from compressor Typical single cylinder type A Air dryers remove water and oil from the air bra...

Page 22: ...necessary E Check operation of AD SP air dryer heater and thermostat Repair or replace as necessary F Check operation and repair or replace as necessary CAUSE REMEDY 6 Unable to build air system press...

Page 23: ...creasing the discharge line volume This can be accomplished by adding an additional four feet of discharge line or adding a 90 cubic inch reservoir between the compressor and the AD SP air dryer A Fau...

Page 24: ...ction loggers concrete mixer dump truck fire truck e g Line haul single trailer w o air suspension air over hydraulic brakes e g Line haul single trailer with air suspension school bus e g City transi...

Page 25: ...only encountered complaints CONVENTIONAL SUPPLY SYSTEM INTEGRAL PURGE AIR DRYER HOLSET TYPE E QE COMPRESSOR WITH ECON VALVE FRONT REAR DASH GAUGE STANDARD SINGLE CHECK VALVE LOW PRESSURE INDICATOR SUP...

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Page 28: ...28 BW1777 2004 Bendix Commercial Vehicle Systems LLC All rights reserved 10 2004 Printed in U S A...