Replace
Replace
Replace the
the
the Isolation
Isolation
Isolation Valve
Valve
Valve Stem
Stem
Stem O
O
O---rings
rings
rings
Use this procedure to replace the three o-rings (219,
2 x 228) on the isolation valve stem (222). Replacing
these o-rings may be necessary if the isolation valve
begins to leak.
1.
Remove the three o-rings (219, 2 x 228).
Note
Do not pry the o-rings off of the valve
stem. You may need to pinch the o-ring
to form a loop and then pull it off. You
may also cut each o-ring to remove.
2.
Replace the o-rings:
a.
Roll o-ring (219) over the valve stem (222)
threads until it fits into the groove.
b.
Roll one o-ring (228) over the valve stem
(222) threads until it fits into the groove.
c.
From the other end of the valve stem (222),
roll the second o-ring (228) onto the shaft
until it fits into the groove.
d.
Grease all 3 o-rings.
Figure 39 Replacing the Isolation Valve
O-rings
3.
Inspect the o-ring (219) inside the shuttle housing
(218) to make sure that it is still in place. Remove
and replace if needed.
4.
To reassemble:
a.
Insert the spring (220) and the sleeve (221)
(wider end first) into the sleeve tool (112).
Figure 40 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 41 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.
96
3A8493A
