Rebuilding - BENDIX AD-IP INTEGRAL PURGE AIR DRYER Manual

A. Electric Power to the Dryer
With the ignition or engine kill switch in the ON posi-
tion, check for voltage to the heater and thermostat
assembly using a voltmeter or test light. Unplug the
electrical connector at the air dryer and place the
test leads on each of the pins of the connector with
the locking latch. If there is no voltage, look for a
blown fuse, broken wires, or corrosion in the vehicle
wiring harness. Check to see if a good ground path
exists.
B. Thermostat and Heater Operation
Note: These tests are not required except in cold weather
operation.
Turn off the ignition switch and cool the thermostat
and heater assembly to below 35 degrees Fahren-
heit. Using an ohmmeter, check the resistance
between the electrical pins in the air dryer connec-
tor half. The resistance should be 1.5 to 3.0 ohms
for the 12 volt heater assembly and 6.0 to 9.0 ohms
for the 24 volt heater assembly.
Warm the thermostat and heater assembly to over
90 degrees Fahrenheit and again check the resis-
tance. The resistance should exceed 1000 ohms. If
the resistance values obtained are within the stated
limits, the thermostat and heater assembly is oper-
ating properly. If the resistance values obtained are
outside the stated limits, replace the heater and ther-
mostat assembly.
REBUILDING THE AD-IP
GENERAL
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
following list to find the appropriate kit(s).
When rebuilding or replacing components of the air dryer
use only genuine Bendix
™
AD-IP air dryer has been designed so that any of the
following maintenance kits can be installed without removing
the air dryer from the vehicle.
MAINTENANCE KITS AVAILABLE:
065624 ............... SERVICE NEW DESICCANT CARTRIDGE KIT
This kit contains the parts necessary to change the
desiccant cartridge only.
109493 ........REMANUFACTURED DESICCANT CARTRIDGE KIT
This kit contains the parts necessary to change the
desiccant cartridge only.
5001247 ....................................... MOUNTING BRACKET KIT
This kit contains the upper and lower brackets as well as
the necessary hardware items to mount them.
™
AIR DRYER
® parts. For ease in servicing, the
109498 .............................................. CARTRIDGE BOLT KIT
Contains a replacement desiccant cartridge bolt and related
o-rings.
5003547 ............. PURGE VALVE HOUSING MAINTENANCE KIT
This kit contains the parts necessary to rebuild the purge
valve housing.
800404 ............................. PURGE VALVE REPLACEMENT KIT
This kit contains the parts necessary to replace the purge
valve.
5018313 ............................ PURGE VALVE MAINTENANCE KIT
This kit contains the parts necessary to replace and
relubricate the purge valve quad-ring and o-rings.
065626 .... SERVICE NEW PURGE VALVE HOUSING ASSEMBLY
Contains a service new assembly and related components
to accomplish replacement.
109494 .............. DELIVERY CHECK VALVE MAINTENANCE KIT
This kit contains the parts necessary to replace the delivery
port check valve.
109495 ............................. 12V HEATER & THERMOSTAT KIT
109496 ............................. 24V HEATER & THERMOSTAT KIT
Each contains a replacement heater and thermostat
assembly and related components required for replacement.
GENERAL SAFETY GUIDELINES
WARNING! PLEASE READ AND FOLLOW
THESE INSTRUCTIONS
PERSONAL INJURY OR DEATH:
When working on or around a vehicle, the following
general precautions should be observed at all times.
1. Park the vehicle on a level surface, apply the
parking brakes, and always block the wheels.
Always wear safety glasses.
2. Stop the engine and remove ignition key when
working under or around the vehicle. When
working in the engine compartment, the engine
should be shut off and the ignition key should be
removed. Where circumstances require that the
engine be in operation, EXTREME CAUTION should
be used to prevent personal injury resulting from
contact with moving, rotating, leaking, heated or
electrically charged components.
3. Do not attempt to install, remove, disassemble or
assemble a component until you have read and
thoroughly understand the recommended
procedures. Use only the proper tools and observe
all precautions pertaining to use of those tools.
4. If the work is being performed on the vehicle's air
brake system, or any auxiliary pressurized air
systems, make certain to drain the air pressure from
TO AVOID
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