GILLIG LOW FLOOR, Руководство по обслуживанию

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Air System
249
Rebuilding the Air Dryer
If, after completing the checks above, it is determined that one or more of the components of the air
dryer requires replacement or maintenance, one or more rebuilding kits may be required. Remember to
use only genuine OEM parts when servicing the air dryer. For ease in servicing, it is recommended that
the air dryer be removed from the coach.
The available kits are:
1. Purge Valve Maintenance Kit: Contains all the parts necessary to rebuild only the purge valve.
2. End Cover Maintenance Kit: Contains the parts needed to rebuild the end cover and includes
the Purge Valve Kit (#1).
3. Major Maintenance: Contains all the parts needed to completely rebuild the air dryer, including
the desiccant cartridge and the End Cover Kit (#2) above.
4. Desiccant Cartridge Replacement Kit: Contains the parts necessary to change only the desic-
cant cartridge.
5. Remanufactured Desiccant Cartridge Replacement Kit: Contains the parts necessary to
change only the desiccant cartridge.
6. Thermostat Maintenance Kit: Contains the parts needed to rebuild the thermostat assembly.
Removal
1. Park the coach on a level surface and block the wheel to prevent movement when the air system
is depressurized. Drain all reservoirs of all air pressure.
2. Identify, tag, and disconnect the three air lines from the end cover and note the position of the
ports relative to the coach frame.
3. Pull the boot from the thermostat and heater cover and slide it onto the wire to expose the con-
nection. Remove the nut and disconnect the wire.
4. Loosen the two bolts securing the mounting straps on the back of the dryer and disengage the
mounting hook from the end cover.
Disassembly
Refer to Figure 6- 47 .
1. Remove the eight 3/8" crown nuts, spring washers, special washers, and cap screws from the
flange of the air dryer and separate the end cover from the air dryer shell. Separate the desiccant
cartridge and sealing plate from the end cover. Remove and discard the three sealing rings. One
sealing ring is located in the groove on the sealing plate and the other two are in grooves in the
end cover.
2. Remove the 1/4" cap screw and lock washer from the bottom of the purge valve and remove the
diaphragm retainer, exhaust diaphragm, and purge valve. Discard the exhaust diaphragm and
purge valve. Remove the purge valve piston and discard the O-ring.
3. Remove and discard the check valve assembly in the recess at the delivery port of the end cover.
4. Remove the safety valve from the end cover only if it has been determined in the serviceability
checks that it requires replacement.