Wetted Section Rebuild - Graco PD44 Operations & Parts List

Wetted Section Rebuild

1. Perform the Wetted Section Disassembly, page
22.
2. Remove the spool rods and sleeves from the meter-
ing 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.
3A7284B
5. Clean all wetted components thoroughly with com-
patible solvent.
6. For each pneumatic drive spool block, install new
zap seals and o-rings onto the o-ring retainer.
High Viscosity Spool
7. Lubricate the o-rings and bearing surfaces with Kry-
tox or a compatible lubricant.
8. Re-install the rod bearings, zap seals, and o-rings
retainers into each spool block.
NOTE: Typically, the spring in the zap seal and the
o-rings in the retainers point toward the metering block
which is in the direction of the material.
9. On each spool sleeve, install the new zap seal and
o-rings on the outside of the sleeves.
10. Lubricate the o-rings and bearing surfaces with Kry-
tox or a compatible lubricant.
NOTE: Correct orientation of the seals shown.
High Viscosity Spool Sleeve Cutout View
Rebuild
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