Wetted Section Rebuild - Graco PD44 Operation & Maintenance Manual

6. Insert new o-ring into spool air cylinder end cap.
7. Install proximity switch.
8. Apply Krytox or compatible lubricant to cylinder.
9. 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.
10. Careful not to cut the o-ring, install pneumatic spool
blocks.
11. Install the two cap screws.
12. Repeat for opposite side pneumatic spool rod drive.

Wetted Section Rebuild

1. Perform Wetted Section Disassembly, page 27.
313876L
Air Inlet O-ring
Cap Screws
2. Remove spool rods and sleeves from the metering
block.
NOTE: The spool sleeve can be removed by sliding the
sleeve in the direction of the identification marking.
3. Remove the pneumatic drive spool bearing, seals,
and seal retainer for both spools.
4. Inspect the metering rod and sleeve assemblies and
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.
5. Clean all wetted components thoroughly with com-
patible solvent.
Rebuild
31