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SERVICING THE PURE AIR FROM THE GOVERNOR/
PURGE VALVE END (BOTTOM) - continued
10. Install new o-ring on canister.
11. Install new filter element. Tighten bolt to 60-90 in. lbs.
12. Slide in new desiccant cartridge. Shake canister vertically until desiccant is seated
in canister (1/2" minimum from top).
13. Install desiccant follower with skirt side toward desiccant.
14. Place inner shell on desiccant canister making sure the o-ring is not pinched.
Insure that desiccant spring is in place.
15. Insert entire assembly into dryer housing.
16. Reinstall the lower cover by starting all six bolts by hand. Tighten the bolts to
150-200 in. lbs.
17. Reconnect inlet/outlet and governor/purge valve line.
18. Reconnect heater wires.
19. Proceed to operational checks.
OPERATIONAL CHECKS
Once the unit is serviced and installed, start the engine and build up pressure to
100 psi and shut off engine. Close the reservoir drains.
Check for air leaks at the inlet and outlet of the dryer. Correct any leakage problem.
Restart engine and build up pressure to compressor cut-out. At cut-out pressure the
dryer purge valve opens and immediately expels a large volume of air, followed by a
slow flow of air lasting approximately 30 seconds. Check for leakage at the purge
governor port.
To check if the heater is operating you must expose 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 the trailer. Re-block 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).
OPERATIONAL CHECKS (continued)
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 water solution liberally applied to the connections is an excellent
method to check for 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.
Haldex Commercial Vehicle Systems
Haldex Brake Products Corporation
10930 North Pomona Avenue
Kansas City, Missouri 64153-1256
Phone: (816) 891-2470
Fax: (816) 891-9447
Haldex Limited/Haldex Limitée
525 Pinebush Road, Unit #1
Cambridge, ON N1T 0A5 CANADA
Phone: (519) 621-6722
Fax: (519) 621-3924
www.haldex.com
L31049 US 3/10 1M ALP (Last Revised 4/02)
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