6-4
6-2 Replacement of Filter and Maintenance of Flow Restriction
The contamination of the flow restriction section in the device caused by instrumentation
air can be removed during maintenance. The replacement and maintenance procedures
are described below.
Handling Precautions:
Use clean dry air with solid particles no larger than 3-μm as the instrumentation
air.
Step Work
1 Shut off the supply air to the device.
2
Loosen the three screws to remove the pilot relay cover and
remove the setscrew in the A/M switch section.
3 Rotate the A/M switch in the MAN direction to remove.
4
Cut the holder with nippers or other tool to remove the old filter.
Handling Precautions:
Properly dispose of the old holder and filter.
5
Clean the flow restriction section using a wire (with a diameter
of 0.25 mm) or other tool.
Handling Precautions:
When cleaning, be careful not to damage the hole of the
flow restriction. Do not use an air gun.
Be careful not to let oil get on the cleaned flow restriction
again.
6
Wrap a new filter around the A/M switch and hold it with the
holder.
7 Screw in the A/M switch until it stops.
8 Screw the setscrew into the A/M switch section.
9 Attach the pilot relay cover with the three screws.
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