Graco Pneumatic PD44 Instructions Manual page 26

Rebuild
2. Remove the drive top cap.
Drive Top Cap
3. Slide the drive rod into the open slot.
4. Slide the pneumatic drive piston off the drive rod.
5. Slide the air cylinder mounting block off the drive
rod.
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6. Install new seals on the drive piston. Make sure the
lip of the seal points toward the pressure side of the
drive. See the following illustration and the assembly
drawings for more information.
7. Remove retaining ring, washer, and posipak seal
from the air cylinder mounting block.
8. Install new posipak seal with the o-ring pointed
towards the drive piston, then install washer and
retaining ring.
Posipak Seal
9. Apply Krytox or compatible lubricant to drive rod.
Retaining Ring
Washer
Posipak Seal
Retaining Ring
Washer
313904B