Graco HydroShield Instructions Manual page 102

Repair
Service Service and Service and Reassemble and Reassemble Reassemble the
of of of the the Isolation the Isolation Isolation Valve Valve Valve
Use this procedure to replace the seals in the
top piston housing. This procedure also covers
reassembling the top piston housing.
1. Disassemble the bottom housing of
the isolation valve as described in
Service the Bottom Piston Housing, page
Remove the piston and spring.
2. Unscrew and remove the top housing piston cap
(210). The housing includes a U-cup (203) and
an o-ring (208).
3. Replace the o-ring (208) and U-cup (203):
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 outwards in the cap.
102
the Top the Top Housing Top Housing Housing
100.
4. Remove the U-cup spacer (206) and the packing
U-cup (204).
5. Replace the U-cup spacer (206) and the packing
U-cup (204):
a. On the smaller side of the U-cup spacer
(206) is a recessed groove that helps align
the packing U-cup (204). Snap or set the
packing U-cup (204) into the groove on the
U-cup spacer (206).
b. Grease around the lip of the seal (204) and
pop it, seal side first, into the housing (201).
6. In the cap (210), apply grease to the o-ring (208)
and U-cup (204).
7. Screw the cap (210) into the housing and tighten
by hand.
8. To complete reassembly, see
Bottom Housing of the Isolation Valve, page
Reassemble the
103.
3A7370C