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Bendix
AD-1
and AD-2
AD-1
FIGURE 1
The air dryer collects and removes moisture and
contaminants before the air reaches the first reservoir. It is
distinctly different than a reservoir drain valve or aftercooler
in that it provides "dry air" for the air brake system. The
daily draining of the system's reservoirs is no longer
necessary, thus reducing maintenance considerably when
compared to an air brake system without an air dryer.
In a system without an air dryer, the life of air brake
components is substantially reduced because of contact
with water and oil in the system and since the air dryer
removes water and oil in vapor form, life of the component
devices is substantially increased when the air dryer is used.
™
Air Dryers
™
AIR DRYER
AD-2
The air dryer can be used on most highway vehicles where
normal compressor loaded time is 90 seconds or less and
unloaded time is 30 seconds or more. If the compressor
remains loaded for long periods of time, such as on a transit
bus, certain changes in the purge volume of the dryer must
be made. For more information regarding increase of the
purge volume, contact our Engineering Department, in Elyria,
Ohio.
The air dryer is installed in the discharge line between the
compressor and the first reservoir. The unit must be mounted
vertically and mounting brackets are provided and can be
adjusted to meet installation requirements.
™
AIR DRYER
1
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Related Manuals for BENDIX AD-1 AIR DRYER
Summary of Contents for BENDIX AD-1 AIR DRYER
- Page 1 ® ® ™ ™ Bendix AD-1 and AD-2 Air Dryers ™ ™ AD-1 AIR DRYER AD-2 AIR DRYER FIGURE 1 The air dryer collects and removes moisture and The air dryer can be used on most highway vehicles where contaminants before the air reaches the first reservoir. It is...
- Page 2 The housing assembly consists of two cylindrical steel The desiccant cartridge and aluminum oil separator filter stampings welded together. For piping convenience, two inlet are removable and comprise a complete serviceable unit. ports, one reservoir port and one purge volume port are The desiccant beads, which are referred to as the “drying provided in the AD-2 ™...
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Page 3: Operation
™ The desiccant beads are held in place by steel perforated NOTE: The AD-1 air dryer does not incorporate an integral plates and filter cloths. The top plate is held in place by a outlet check valve. The single check valve in an ™... -
Page 4: Air Pressure
™ AD-2 AIR DRYER OPERATIONAL CHARGE CYCLE - AIR PRESSURE FIGURE 3 ™ AD-2 AIR DRYER OPERATIONAL PURGE CYCLE - AIR PRESSURE FIGURE 4... - Page 5 A. An outside air source has been used to charge the 4. Check for excessive leakage at the purge valve by system. This air did not pass through the drying coating the exhaust with a soap solution while the bed. compressor is loaded.
- Page 6 ® 8. Use only genuine Bendix replacement parts, D. Reassembly components and kits. Replacement hardware, Reinstall the thermostat cover according to Figure tubing, hose, fittings, etc. must be of equivalent size, 17. Take special care to assure the rubber spacer...
- Page 7 End Cover Removal the plate is removed. In the past, three methods have been 1. Loosen the three cap screws on the end cover and turn employed, to secure the desiccant sealing plate to the the retaining clamps aside (cap screws may be left desiccant cartridge: a Tru Arc retaining ring, two special finger tight).
- Page 8 IMPORTANT: Only the current revision desiccant cartridges perforated plates and desiccant material. (See Figure 7) can be rebuilt. Current revision desiccant cartridges are identified positively by the Bendix trademark BW stamped in the hex head of the cartridge bolt, and by ™...
- Page 9 4. Insert one of the perforated plates into the cartridge, cloth side up, and tap it firmly to the bottom. (Cloth always faces desiccant material.) (See Figure 8) FIGURE 12 FIGURE 11 5. Slide oil separator filter over the cartridge bolt with the gasket surface next to the shell.
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Page 10: Cover Assembly
DISASSEMBLY ™ REBUILDING THE AD-1 AIR DRYER END COVER ASSEMBLY To remove the end cover assembly from the air dryer follow steps 1-6 under the section of this manual entitled Removal of Desiccant Cartridge AD-1 ™ and AD-2 ™ air dryer. Before rebuilding the end cover, clean the exterior thoroughly using a quality commercial solvent. - Page 11 15. Install the thermostat metal side down in the end cover NOTE: If during the serviceability checks it was determined bore and secure it in place using the retaining clip or that the thermostat was defective, use the following shield and the two screws. procedure.
- Page 12 3. Check the end cover o-ring to be certain it is clean and lubricate the o-ring with a barium base lubricant such as Bendix 246671. Install the o-ring on the end cover and install the end cover in the dryer body.
- Page 13 287053 AD-2 ™ AIR DRYER PURGE VALVE MAINTENANCE tubing or high temperature hose. However, Bendix compressors require a minimum of four feet of copper This kit contains the parts necessary to rebuild the tubing extending from the discharge port. The balance ™...
- Page 14 COMPRESSOR GOVERNOR UNLOADER AD-2 ™ DRYER TO NO. 2 RESERVOIR #1 RESERVOIR SAFETY VALVE PURGE DRAIN VALVE #16 GAGE WIRE TO IGNITION FIGURE 18 - TYPICAL INSTALLATION FOR THE AD-2 ™ AIR DRYER COMPRESSOR GOVERNOR UNLOADER AD-1 ™ DRYER TO NO. 2 RESERVOIR #1 RESERVOIR CHECK VALVE*...
- Page 15 When compressor is loaded (compressing) additional purge volume. longer than 90 seconds during normal operation, additional purge volume may be needed. (Before proceeding, contact Bendix representation for consultation.) Air dryer not compatible with vehicle Air dryer requires minimum purge time of 30 air system requirement - (Improper air seconds.
- Page 16 NOTE: This type of failure can be prevented by governor failure in conjunction with checking the dryer for proper operation every safety valve failure. three (3) months. BW1597 © 2004 Bendix Commercial Vehicle Systems LLC All rights reserved. 7/2004 Printed in U.S.A.