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SERVICING THE PURE AIR DRYER FROM THE
INLET/OUTPUT END (CONT'D)
12. To reassemble the desiccant canister (cont'd):
b. Install a new filter element (Item 1 - Kit Contents) on the base of
the center tube unit with the screw and plastic follower. Tighten the
screw and torque to 60-90 in.lbs.
c. Install a new lubricated "O"-Ring in the groove at the bottom of the
center tube unit (Item 4 - Kit Contents).
d. Insert a new desiccant bag (Item 2 - Kit Contents) in the center
tube. Push or shake bag down until desiccant is seated in the
bottom of the cylinder.
e. Install desiccant follower with skirt side toward the desiccant bag.
f. Install intermediate cylinder on center tube assembly making sure
the "O"-Ring is not pinched when cylinder is seated.
g. Insert entire assembly into dryer housing from the top.
h. Position the spring on top of the desiccant follower.
13. To service the top cover:
a. Remove and discard all three "O"-Rings.
b. Clean the top cover and install three new lubricated "O"-Rings
(Items 3, 4 and 5 - Kit Contents).
c. Install the top cover on the six top studs and press the cover down
into place.
d. Install the six 1/2" hex flange nuts and draw cover down evenly.
Tighten the nuts and torque to 100-150 in.lbs.
14. Install new check valve seal (Item 6 - Kit Contents) with rubber side
down. Install check valve spring with smallest diameter toward the seal.
15. Install new lubricated "O"-Ring on check valve end cap
(Item 7 - Kit Contents).
16. Install end cap. Tighten and torque to 35-50 ft.lbs.
17. Reconnect inlet, outlet and purge valve air lines.
18. Reconnect heater wires.
19. Proceed to operational checks.
OPERATIONAL
CHECKS
Once the unit is serviced and installed, close the reservoir drains, start the
engine and build up pressure to 100 psi and shut off engine.
Check for air leaks at the inlet and outlet of the dryer. Correct any leakage
problem.
Re-start engine and build up pressure to compressor cutout. At cutout pressure
the dryer purge valve opens and immediately expells a large volume of air,
followed by a slow flow of air lasting approximately thirty (30) seconds. Check
for leakage at the purge governor port.
To check operation of the heater, you must subject the unit to 32°F. At this
temperature the thermostat is closed and the bottom housing should begin to
feel warm. The temperature should continue to rise until the thermostat opens
between 55-75°F.
Before placing the vehicle back in service, close the reservoir drains and perform
the following tests:
1. Remove blocks from wheels and reconnect tractor to trailer. Reblock the
tractor and trailer wheels. Charge the tractor air system. Activate the trailer
fill valve in the tractor cab. Observe the trailer brakes applying and
automatically releasing as the trailer reservoir(s) are filling (except for dolly
applications which may use a non-charging type relay emergency valve).
2. Adjust the trailer brakes.
3. Make several service brake applications and visually check for a brisk
application and release of trailer brakes.
4. Make and hold a service brake application. Check for air pressure leakage
at all fittings. A soap and water solution liberally applied to the connections
is an excellent method for checking air pressure leakage. Tighten fittings,
if required.
5. Release the service brake application. Place the vehicle park valve (in the
tractor cab) in the park position. Observe full trailer brake application.
Place the park valve in the drive (not parked) position, and observe full
brake release.
6. Upon successful completion of the above tests, remove the wheel blocks.
SEE REVERSE SIDE FOR SERVICING THE PURE
AIR DRYER FROM THE GOVERNOR/PURGE VALVE END
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