Logix
®
520MD+ and 510+ Digital Positioners FCD LGENIM0105-15-AQ – 05/16
62
18.9 Cleaning & Replacing a Double Acting Pilot Relay
Removal
1. Remove the Main Board. See procedure above.
2. Fully loosen the 2 spool block screws. By squeezing the two
screws toward each other, grip the spool block and pull it
straight out. Take care to slide the spool straight out of the spool
seat to avoid bending the spool or damaging the clip spring. The
small clip spring should remain attached to the spool.
3. Remove the first manifold gasket.
4. Remove the 2 manifold screws.
5. Remove the manifold assembly.
6. Remove the second manifold gasket and manifold O-ring.
Cleaning
1. Using acetone and a cotton cloth wipe down the block and
manifold.
2. Use cotton swabs to reach inside air passage ways.
3. Dry components thoroughly.
a
CAUTION: Follow precautions on acetone label and MSDS.
Installation
1. Place the manifold gasket and manifold O-ring into the base.
2. Place the manifold assembly.
3. Place the 2 manifold screws.
4. Place the manifold gasket.
5. Ensure the spool is oriented properly in the block. Ensure the
clip spring is oriented properly on the spool. (See 62-Figure
56.) Holding the block level, slide the spool/block/clip spring
assembly onto the manifold ensuring the proper placement of
the spool and clip spring into the piston slot and tighten the 2
spool block screws.
6. Reassemble the main board and covers and calibrate.
Figure 54: Inserting the Double Acting Block Assembly
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