9
REPAIRING THE AD-SP
™
AIR DRYER 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 repairing
or replacing components of the air dryer use only genuine
Bendix parts.
MAINTENANCE KITS AVAILABLE:
109495 ... 12 VOLT REPLACEMENT HEATER AND THERMOSTAT
ASSEMBLY KIT
109496 ... 24 VOLT REPLACEMENT HEATER AND THERMOSTAT
ASSEMBLY KIT
109993 ... TURBO CUT-OFF MAINTENANCE KIT
5008414 . DESICCANT CARTRIDGE REPLACEMENT
109995 ... PURGE & RELIEF VALVE MAINTENANCE KIT
65677 ... The SC-PR
™
single check protection valve is
non-serviceable. Replace as an assembly.
WARNING! PLEASE READ AND FOLLOW
THESE INSTRUCTIONS TO
AVOID
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
all reservoirs before beginning ANY work on the
vehicle. If the vehicle is equipped with an AD-IS
™
air dryer system or a dryer reservoir module, be
sure to drain the purge reservoir.
5.
Following the vehicle manufacturer’s
recommended procedures, deactivate the electrical
system in a manner that safely removes all
electrical power from the vehicle.
6.
Never exceed manufacturer’s recommended
pressures.
7.
Never connect or disconnect 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 and kits. Replacement hardware,
tubing, hose, fittings, etc. must be of equivalent
size, type and strength as original equipment and
be designed specifically for such applications and
systems.
9.
Components with stripped threads or damaged
parts should be replaced rather than repaired. Do
not attempt repairs requiring machining or welding
unless specifically stated and approved by the
vehicle and component manufacturer.
10. Prior to returning the vehicle to service, make
certain all components and systems are restored to
their proper operating condition.
11. For vehicles with Antilock Traction Control (ATC),
the ATC function must be disabled (ATC indicator
lamp should be ON) prior to performing any vehicle
maintenance where one or more wheels on a
drive axle are lifted off the ground and moving.
AD-SP
™
AIR DRYER REMOVAL
1. Park the vehicle on a level surface and prevent movement
by means other than the brakes.
2. Drain ALL reservoirs to 0 p.s.i. (0 kPa). - Caution:
Compressor discharge line may still contain
residual pressure.
3. Identify, mark and disconnect the supply, delivery and
control port air lines. Disconnect the wiring harness
connector from the heater and thermostat assembly
connector on the body assembly.
4. If so equipped, disconnect, remove and save the exhaust
line from the exhaust port of the air dryer.
5. Remove the three mounting bolts that secure the air
dryer to the vehicle and remove the air dryer.
Note: It is important to retain the three mounting bolts
since their length is specific to mounting the air dryer
without damage. If these bolts must be replaced, the
same length must be used.
6. Remove the AD-SP
™
air dryer from its mounting brackets
on the vehicle.
DISASSEMBLY FOR PART REPLACEMENT
AND KIT INSTALLATION
1. The following disassembly and assembly procedures are
presented for reference purposes and assumes that the
appropriate AD-SP
™
air dryer kits are on hand. The
instructions provided with these parts and kits should
be followed instead of the instructions presented here.
2. The replacement parts and maintenance kits that are
available do not require full disassembly and in most
cases do not require the removal of the AD-SP
™
air dryer
from the vehicle.
3. If removal of the air dryer is necessary adhere to the
following caution:
