Wetted Section Rebuild - Graco Pneumatic PD44 Instructions Manual

6. Install proximity switch.
7. Apply Krytox or compatible lubricant to cylinder.
8. Insert piston into cylinder with the u-cup lip pointed
in the direction of the tapered end of the cylinder.
The "U" points toward the air inlet.
9. Careful not to cut the o-ring, install pneumatic spool
blocks.
10. Install the two cap screws.
11. Repeat for opposite side pneumatic spool rod drive.

Wetted Section Rebuild

1. Perform valve disassembly. See Wetted Section
Disassembly on page 19.
313904B
2. Remove spool rods and sleeves from the metering
Air Inlet O-ring
NOTE: The spool sleeve can be removed by sliding the
sleeve in the direction of the identification nameplate.
3. Remove the pneumatic drive spool bearing, seals,
4. Inspect the material rod and sleeve assemblies and
Cap Screws
block.
and seal retainer for both spools.
the spool rod and sleeve assemblies for excessive
wear. If there are any scratches on the rod that can
be felt by a fingernail, replace the rod and sleeve
assembly.
Rebuild
23