Graco Pneumatic PD44 Instructions Manual page 24

Rebuild
5. For each pneumatic drive spool block, install new
spool rod bearing, zap seals, and o-rings onto o-ring
retainer.
Low Viscosity Spool
High Viscosity Spool
6. Lubricate o-rings and bearing surfaces with Krytox
or compatible lubricant.
7. 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.
8. On each spool sleeve, install new zap seal (on low
viscosity spool), and o-rings on the outside of the
sleeves.
9. Lubricate o-rings and bearing surfaces with Krytox
or compatible lubricant.
24
NOTE: Typically, the spring in the zap seals point toward
the center of the low viscosity spool sleeve.
Low Viscosity Spool Sleeve Cutout View
High Viscosity Spool Sleeve Cutout View
10. Carefully install the spool sleeves into the metering
block. Make sure the notched edge will align with
the pin in the metering block and not cut the spool
sleeve o-rings.
Spool Sleeve
Spool Sleeve Notch
Metering Block
313904B