Graco EcoQuip 300, Operation, Repair, And Parts

Page: 29 / 46

Repair
Flushing Flushing Flushing the the the Diaphragm Diaphragm Diaphragm Valve Valve Valve
This procedure can be performed with the component
still mounted in the panel.
If large-grit abrasive or other foreign matter become
lodged in the diaphragm valve, it will become
necessary to flush the valve. This is a simple
procedure; however, it does cause the release of a
large volume of air to escape through the released
quick coupling. You need to be prepared for the
release of air by pulling the quick coupler grommet
out of its groove so that it does not get lost.
1. Operate the unit in WASH (see
Using the Wash Feature, page 17 ) until
all abrasive clears from the blast hose.
2. Close the abrasive ball valve, then turn the
selector valve to RINSE.
3. Disconnect the quick coupling at the abrasive
ball valve (not at the bottom of the pot).
4. Turn the selector valve to WASH. This will pump
water out of the quick coupler and allow you
to reach up inside and clear all abrasive and
remove the grommet.
5. Make sure nothing is in the path of the open
quick coupler, then engage the blast control
briefly and several times.
NOTE: NOTE:
NOTE: High flow air should escape through the
cam-lock coupling. If this does not occur, the
diaphragm valve is malfunctioning. Replace
entire diaphragm canister (EQ5140 – EQ600,
EQ5142 – EQ300).
6. Hold the male end of the quick coupler up to
the water coming from the cam-lock end of the
coupler. Clean off any dirt or abrasive.
7. Turn the selector valve to RINSE to stop the flow
of water.
8. Re-insert the grommet into its internal groove
inside the cam-lock.
9. Reconnect the quick coupler. If properly cleaned
and connected, there should be no leaks at the
coupler during operation.
334143C 29