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Repairing
thethe
the
MainMain
Main
AirAir
Air
RegulatorRegulator
Regulator
NOTE:NOTE:
NOTE:
Repair parts are available in Kit 17C131
(EQ600) or Kit 17C129 (EQ300).
1. Perform Pressure Relief Procedure, page 8 .
2. Make sure all of the air pressure is relieved in
the unit. Remove the water separator lter for
access to the piston cover and return spring.
3. Use a crescent wrench that can open to 2 in. (5
cm) to unscrew the piston cover.
NOTE:NOTE:
NOTE:
There is a spring inside this cover.
4. Unscrew the diaphragm cover for access to the
diaphragm and to the end of the piston shaft.
5. Remove the diaphragm and inspect for any
cracks or tears. Replace the diaphragm if
necessary.
6. Carefully remove the spring and piston assembly,
then clean out any debris in the body of the
regulator.
7. Push the piston shaft and remove the piston from
the opposite end of the regulator housing.
8. Inspect the piston for any foreign matter that may
have been the cause for the piston to stay open.
9. Inspect for any damage to the piston shaft where
it interacts with the diaphragm cup.
NOTE:NOTE:
NOTE:
Excessive wear here indicates the
main check valve is not sealing. Contact your
distributor if this happens.
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