BENDIX AD-IS AIR DRYER Manual
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BENDIX AD-IS AIR DRYER Manual

Air dryer and reservoir system
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See also: Service Data
®
Bendix
®
AD-IS
®
PRESSURE
PROTECTION
22
VALVES (4)
SEC
DELIVERY TO
SECONDARY
RESERVOIR
PURGE
RESERVOIR
UNL
GOVERNOR
UNLOADER (2)
GOVERNOR
EXH
GOVERNOR
EXHAUST
®
FIGURE 1 - AD-IS
AIR DRYER AND RESERVOIR SYSTEM
DESCRIPTION
The function of the Integrated Solution Air Dryer (AD-IS
and Reservoir System is to provide heavy vehicles with an
integrated vehicle air dryer, purge reservoir, governor and a
number of the charging valve components in a module.
These have been designed as an integrated air supply
system.
The AD-IS
®
air dryer and reservoir system collects and
removes air system contaminants in solid, liquid and vapor
form before they enter the brake system. It provides clean,
dry air to the components of the brake system which
increases the life of the system and reduces maintenance
costs. The necessity for daily manual draining of the
reservoirs is eliminated.
Air Dryer and Reservoir System
RES
GOVERNOR
RESERVOIR (2)
21
PRI
DELIVERY TO
PRIMARY
RESERVOIR
PURGE VALVE
®
AD-IS
AIR DRYER
SUPPLY FROM
PART NUMBER
COMPRESSOR
STAMPED HERE
DESICCANT
CARTRIDGE
SAFETY VALVE
MOUNTING
BOLTS (3)
HEATER /
THERMOSTAT
1
IN
Air
Connection
Port ID
®
)
1
IN
21
PRI
22
SEC
24
AUX 1
23
AUX 2
UNL
RES
EXH
TABLE 1 - PORT DESIGNATIONS
PRESSURE PROTECTION
DELIVERY PORTS
VALVES (4)
Function/Connection
Inlet Port (air in).
Delivery Port out (to Primary reservoir)
Delivery Port out (to Secondary reservoir)
Auxiliary Delivery Port (air out).
Auxiliary Delivery Port (air out).
Unloader Control Air (D-2A
™
Common Reservoir Pressure
(D-2A
™
Governor)
Governor Exhaust
MOUNTING
HOLES - 4
23
AUX2
AUXILIARY
DELIVERY PORTS
(2)
24
AUX1
AUXILIARY
(4)
QTY
1
1
1
4
1
Governor)
2
2
1
1

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Summary of Contents for BENDIX AD-IS AIR DRYER

  • Page 1 ® Bendix ® AD-IS ® Air Dryer and Reservoir System GOVERNOR RESERVOIR (2) DELIVERY TO MOUNTING DESICCANT PRIMARY HOLES - 4 CARTRIDGE RESERVOIR PURGE VALVE PRESSURE PROTECTION VALVES (4) DELIVERY TO SAFETY VALVE SECONDARY RESERVOIR PURGE MOUNTING RESERVOIR BOLTS (3)

  • Page 2: Air Dryer/Reservoir System Charge Cycle

    Note 1: ® The AD-IS air dryer and reservoir system DESICCANT purge piston has a purge control channel drain. This allows any condensation in this area to flow past a diaphragm in the top of the purge piston and out through a channel in the middle of the central bolt of the purge SEPARATOR assembly to be drained.

  • Page 3: Air Dryer/Reservoir System Purge Cycle

    DESICCANT SEPARATOR DELIVERY CHECK PURGE VALVE ORIFICE (CLOSED) GOVERNOR PURGE RESERVOIR UNLOADER PORT PRESSURE PROTECTION VALVES PURGE INLET CONTROL PORT CHANNEL (IN) TURBO CUT- OFF VALVE EXHAUST (CLOSED) PURGE VALVE SAFETY (OPEN) VALVE PRIMARY AUXILIARY PORTS PORT (TO ACCESSORIES) (PRI) PURGE RESERVOIR DRAIN VALVE...

  • Page 4: Purge Cycle

    Purge valve maintenance is permissible purge valve to open to the atmosphere and the turbo cut-off during the warranty period only when using a genuine Bendix valve to close off the supply of air from the compressor (this purge valve kit.

  • Page 5: Operation & Leakage Tests

    HEATER AND THERMOSTAT CONNECTOR C. Location of the air dryer and reservoir system is too OPERATION & LEAKAGE TESTS (ALSO SEE close to the air compressor. Refer to Bendix VIDEO BW2327) Specification BW-100-A, Appendix B for discharge 1. Check all lines and fittings leading to and from the air line lengths.

  • Page 6: Pressure Protection Valve Locations

    A. Electric Power to the Dryer ® REBUILDING THE AD-IS AIR DRYER AND With the ignition or engine kill switch in the RUN RESERVOIR SYSTEM position, check for voltage to the heater and GENERAL SAFETY GUIDELINES thermostat assembly using a voltmeter or testlight. Unplug the electrical connector at the air dryer and WARNING! PLEASE READ AND FOLLOW reservoir system and place the test leads on each of...
  • Page 7 GENERAL 6. Never exceed manufacturer’s recommended When rebuilding or replacing components of the air dryer pressures. and reservoir system use only genuine Bendix parts. For 7. Never connect or disconnect a hose or line ease in servicing, the AD-IS ®...

  • Page 8: Testing

    5004052: This kit contains the parts necessary to replace system will not cycle excessively. the delivery check valve. See Bendix publication BW5057 "Air Brake Handbook." • Purge Valve Maintenance Kit - Part Number 5018313: This kit contains the parts necessary to BRAKING SYSTEM PROTECTION replace and relubricate the purge valve sealing rings.

  • Page 9: Delivery Check Valve Cleaning Procedure

    GOVERNOR GASKET (SPECIAL GASKET, SEE NOTE 6) GOVERNOR (NON-ADJUSTABLE, 130 PSI CUT-OUT) SMALL O-RING BOLTS CHECK VALVE BODY SPRING LARGE O-RING ADAPTER FIGURE 7 - AD-IS ® AIR DRYER AND RESERVOIR SYSTEM DELIVERY CHECK VALVE cut-out pressure (a 1” bubble in 10 seconds is acceptable), See Figure 7 throughout this procedure.

  • Page 10: Cleaning And Inspection

    5. Grease the adapter and the remaining larger o-ring and install it onto the fitting. 6. Position the Bendix supplied gasket, then insert the governor mounting bolts through the governor and tighten (to 125 in-lbs). (Note: Do not replace with a standard compressor/governor gasket.)

  • Page 11: Troubleshooting

    ® AD-IS AIR DRYER AND RESERVOIR SYSTEM TROUBLESHOOTING CHART REMEDY SYMPTOM CAUSE 1. Dryer is constantly A. Excessive system A. Test for excessive system leakage. “cycling” or purging. leakage. Allowable leakage observed at dash gauge: Single vehicle - 1 psi/minute. Tractor trailer - 3 psi/minute.
  • Page 12 (outside air not passing through air dryer). C. Excessive air usage - C. Refer to Bendix Advanced Troubleshooting Guide Air dryer not compatible for Air Brake Compressors (BW1971) for proper with vehicle air system application of the AD-IS ®...
  • Page 13 TROUBLESHOOTING CHART (Continued) REMEDY SYMPTOM CAUSE ® 3. Safety valve on air dryer A. Defective AD-IS air dryer A. Test to determine if air is passing through check “popping off” or and reservoir system valve. Repair or replace. Refer to Symptom 1, delivery check valve.
  • Page 14 C. Compressor passing C. Check for proper compressor installation; if symptoms persist, replace compressor. Refer to excessive oil. Bendix Advanced Troubleshooting Guide for Air Brake Compressor (BW1971). A. A slight “pinging” sound may be heard during A. Single cylinder 9. “Pinging” noise...
  • Page 15 TROUBLESHOOTING CHART (Continued) REMEDY SYMPTOM CAUSE A. Compressor fails to A. Check air hose from governor to compressor for a 10. The air dryer purge “unload”. missing, kinked or restricted line. Install or repair piston cycles rapidly in air hose. the compressor unloaded (non- Repair or replace compressor unloader.
  • Page 16 BW2234 © 2007 Bendix Commercial Vehicle Systems LLC All rights reserved. 5/2007 Printed in U.S.A.

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