Graco HydroShield Instructions Manual page 101

6. Replace the piston seals:
a. Place one U-cup (212) onto the piston (211).
The U-cup must face the top (shaft of the
piston).
b. Place the spacer washer (213) next to the
U-cup (212).
c. Place the other U-cup (212) onto the piston
(211). The U-cup must face the bottom (the
retaining cap).
d. Use medium strength thread lock on the
retaining cap (214).
e. Screw the retaining cap (214) into the piston
(211).
f. To tighten, use an adjustable wrench around
the flats at the bottom of the piston shaft
(211). Use a 3/8 inch hex wrench inside the
retaining cap (214).
Figure 44 U-cups Facing Opposite Directions
7. Continue disassembling the lower housing:
Use a 15/16 inch socket or wrench to remove the
retainer (white) (202) from the housing (201). Be
careful not to strip the piece.
3A7370C
8. Remove the retainer (202).
9. Replace the retainer (202) seals:
a. Replace the O-ring (208) into the groove next
to the threads.
b. Replace the U-cup (203) where it sinks into
place. The U-cup faces out.
10. Continue disassembling the lower housing:
Remove the U-cup spacer (206) and the packing
U-cup (204). Residual paint may appear.
11. To replace the seals in the top housing, see
Service and Reassemble the Top Housing of the
Isolation Valve, page
Figure 45 Lower Retainer
Repair
102.
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