Graco HydroShield Instructions Manual page 100

Repair
4. To reassemble:
a. Insert the spring (220) and the sleeve (221)
(wider end first) into the sleeve tool (112).
Figure 41 Reassembling Spring and Sleeve
into Tool
b. Place the stem tool (113) over the sleeve
(221) and spring (220) and screw into the
sleeve tool (112).
c. Screw both tools into the shuttle housing
(218) until tight.
d. Grease the threaded end of the valve stem.
Slide the threaded end of the valve stem
(222) into both tools (112, 113) that are
mounted on the shuttle housing (218).
Figure 42 Inserting Valve Stem into Tools
e. When the valve stem (222) reaches the
threads, insert a 3/16 inch Allen wrench into
the end of the valve stem. Torque to 80 in-lb
(9 N•m).
5. To remove the tools from the isolation valve,
unscrew both tools as one.
100
Service the Service Service the the Bottom Bottom Piston Bottom
Use this procedure to replace the seals in the lower
piston housing.
1. With the isolation valve lying down, remove the
check valve assembly (238), if still connected.
2. Unscrew and remove the bottom housing piston
cap (216). The housing includes a spring (215)
and o-ring (230). Residual wash fluid may
appear.
3. Pull out the piston assembly (211-214 and
o-rings).
Note
Be careful not to scratch or drop the
piston (211) when extracting and
handling.
4. To remove the retaining cap from the piston
(211), 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).
5. Once loosened, turn the piston shaft (211) to
separate all piston assembly pieces.
Figure 43 Removing Retaining Cap from Piston
Piston Housing Piston Housing Housing
3A7370C