Remove Piston And Piston Rod Seals - Graco Premier 16P239 Repair Parts

Replace Cylinder

Remove Piston and Piston Rod Seals

1. Stop the pump at the middle of its stroke. Relieve
the pressure before performing any service.
2. Remove the six screws (13), the lift ring (3), and the
o-ring (11*). See F
IG
3. Using a 17 mm socket wrench, remove the fifteen
capscrews (12) holding the motor cap (2) to the cyl-
inder (1). Lift the motor cap off the cylinder. Remove
and inspect the o-ring (10).
4. Disconnect the air motor from the displacement
pump (see your separate pump manual). Leave the
adapter (R) attached to the piston rod.
5. Using a rubber mallet, drive the piston assembly (5)
out of the cylinder (1). Do not use a hammer.
6. Remove and inspect the piston o-ring (9*). Check
the piston and piston rod for scoring or damage.
Leave the piston rod and adapter (R) assembled
unless any of these parts requires replacement.
7. If it is necessary to disassemble the adapter (R)
from the piston rod, be careful not to scratch the pis-
ton rod. Using adjustable wrenches on the flats of
the piston rod, unscrew it from the adapter (R).
8. Remove the screws (14) and the bottom support
bracket (35). Press the bearing (6), o-ring (11*), seal
(7*) and wiper (8*) out the bottom of the cylinder (1).
Inspect these parts for wear or damage.
9. Check the inner surface of the cylinder (1) for scor-
ing or other damage.
6
. 3, page 7.
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