7Instruction Manual
SECTION 2 - DISASSEMBLY AND ASSEMBLY PROCEDURE
2.1 DISASSEMBLY
1. Disconnect the supply and instrument air
pressure lines.
2. Remove the six ¼ -20 NC nuts from the air
control valve hold-down studs.
3. Mark the alignment between the air control
valve, gasket, cylinder and mounting ange to
facilitate reassembly.
4. Remove positioner by sliding off hold-down
studs.
5. Remove spring adapter plate and spring from
bore of cylinder.
6. Slide plastic cylinder off mounting studs to
expose piston.
7. Hold piston O.D. and remove mounting screw
in center of piston.
8. Remove the mounting screw in the ange and
the screw in the barrel of the ange. Now slide
the ange off the pump capacity control boss.
9. Use a thin screwdriver or similar tool to remove
“E” ring which retains the piston adapter onto
the pump capacity control spool.
This completes the disassembly.
2.2 ASSEMBLY
For assembly follow the disassembly procedure in
reverse order (descending step numbers from
9 to 1) making certain that the O-rings are lubricated
with pump oil or ring lubricant before assembly of
the retaining part. Make certain that parts are
aligned in the same way as the original assembly.
Make certain the gasket between the Moore
positioner and the cylinder body is positioned so
that the small hole in the gasket, adjacent to the
stud hole, is aligned with the corresponding hole
through the plastic cylinder.
2.3 CALIBRATION AFTER ASSEMBLY
To calibrate the pneumatic capacity control
after reassembly, apply an instrument air signal
corresponding to 100% capacity setting. Remove
the cover on the top of the valve positioner and use
a screwdriver to turn the zero adjust until the piston
seal line corresponds to the 100% graduation on
the % capacity decal. Turn the adjusting screw
counter clockwise to move the piston away from
the pump.
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