7
psi (±6 psi) there should be an associated leveling off (or
momentary slight fall) of pressure as the third and fourth
pressure protection valves open. Then the primary and
secondary gauges should increase together until they
reach their full pressure of approximately 130 psi (±5
psi).
If the Bendix
®
AD-IS
®
air dryer and reservoir system does
not perform within the pressure ranges as described
above, recheck using gauges known to be accurate.
If the readings remain outside of the ranges outlined,
replace the AD-IS air dryer and reservoir system.
NOTE: There are no kits available for the servicing
of the pressure protection valves. Warning: Do not
attempt to adjust or service the pressure protection
valves—incorrect pressure protection valve settings
can result in automatic application of the vehicle spring
brakes without prior warning (in the event one of the
supply circuits experiences rapid pressure loss).
GENERAL
When rebuilding or replacing components of the air dryer
and reservoir, use only genuine Bendix
®
brand replacement
parts. For ease in servicing, the AD-IS air dryer and
reservoir have been designed so that maintenance kits can
be installed without removing the air dryer and reservoir
from the vehicle.
CAUTION:
Always depressurize the air
dryer and purge reservoir—and all other reservoirs on the
vehicle—to 0 psi before servicing the air dryer.
If—after completing the routine operation and leakage
tests—it has been determined that one or more components
of the air dryer requires replacement or maintenance, refer
to the Maintenance Kit listing shown in this manual or the
Bendix
®
Quick Reference Catalog for the appropriate kit(s).
The Quick Reference catalog (BW1114) can be ordered
and viewed on line at
www.bendix.com.
NOTE:
Kits are not available for the servicing of the
pressure protection valves (See Figure 5). Do not attempt
to adjust or service the pressure protection valves - these
are not service items.
TESTING THE BENDIX
®
AD-IS
®
AIR DRYER
AND RESERVOIR SYSTEM
Before placing the vehicle into service, perform the
following tests:
1. Close all reservoir drain valves.
2. Build up system pressure to governor cut-out and note
that the Bendix
®
AD-IS
®
air dryer purges (with an audible
burst of air), followed immediately by approximately 30
seconds of air fl owing out of the purge valve.
3. “Fan” the service brakes to reduce system air pressure
to governor cut-in. Note that the system once again
builds to full pressure and is followed by a purge at the
air dryer exhaust.
4. It is recommended that the total air system be tested for
leakage to assure that the AD-IS air dryer and reservoir
system will not cycle excessively.
BRAKING SYSTEM PROTECTION
The AD-IS air dryer allows the system to maintain one brake
circuit up to about 100 psi even after a pressure loss in the
other brake circuit. This allows a vehicle to be moved (in an
emergency), but with reduced braking capacity. Compare
this to a conventional system, where a loss of pressure in
one service tank leaves the vehicle with a limited number
of reduced braking capacity applications before the parking
brakes automatically apply and stay on
.
See Bendix publication BW5057 "Air Brake Handbook
."
Maintenance Kits
Kit Description
Piece No.
Delivery Check Valve Replacement Kit
5004052
Desiccant Cartridge Replacement Kit (Standard)
5008414
Desiccant Cartridge Replacement Kit - Bendix
®
AD-IS
®
PuraGuard
®
air dryer (can be used to replace the standard
cartridge)
5008414PG
Drain Valve
5004961N
Governor and Check Valve Replacement Kit
5004049
Governor Gasket
5007834
Heater & Thermostat Replacement (12 volt)
109495
Heater & Thermostat Replacement (24 volt)
109496
Bendix
®
PuraGuard
®
Oil Coalescing Desiccant Cartridge
Service New Kit
K020366
Mounting Bolt Kit
5009233
Protective Boots (for pressure protection valves)
5005163
Safety Valve
800350
Splash Shield Kit (includes bracket and cover)
5006698
Splash Shield Cover
5005266N
Silencer Kit
K021189
Wiring Harness & Splice Kit
109871N
Purge Valve Assembly Type
Configuration
Service Kit
Pc. No.
Purge Valve Assembly for
climate conditions above
-40°C (-40°F)
Bendix
®
AD-IS
®
Air Dryer
K022105
AD-IS
®
EverFlow
®
Module
K031560
AD-IS
®
Discharge Line
Unloader
K031562
Arctic Purge Valve Assembly
for climate conditions of
-40°C to -50°C
(-40°F to -58°F)
AD-IS
®
Air Dryer
K031559
AD-IS
®
EverFlow
®
Module
K031561
AD-IS
®
Discharge Line
Unloader
K031563
