Maintenance
Waukesha Cherry-Burrell
Page 18
95-03076
August 2008
Disassembly of Valve Stems
The valve stems must be disassembled in order to replace the seat ring.
1. Using an open end wrench, remove the lower stem (Figure 15, item A) from
the actuator by turning it counter-clockwise.
NOTE:
Before disassembly, note the position of the upper and lower seat lifting
adjustment nuts. See Figure 13 on page 17.
2. To remove the upper stem (Figure 16, item B), hold the adjusting sleeve with
the spanner wrench, turn the stem counter-clockwise, and remove it from the
actuator. If the adapter (Figure 16, item C) comes out of the yoke, handle it
with care.
A = Lower Stem
B = Upper Stem
C = Top Adapter (Bonnet)
Adapter Bearings and
O-rings
Inner O-ring and Bearing Replacement
1. Remove the valve stem assembly from the actuator and slide the adapter off
the outer stem.
2. Remove and replace the o-ring (Figure 17, item A) inside the adapter.
3. Check the split bearing (Figure 17, item B) inside the adapter by feeling the
amount protruding from the adapter wall. If the bearing is flat against the
wall, replace the bearing.
4. Place a screw driver behind the bearing and pry it away from the wall of the
adapter. A needle-nose pliers can be used to grip the bearing for removal.
Use care not to scratch or damage the metal surfaces.
NOTE:
The bearing will be damaged during
removal and must be replaced with a new
bearing.
5. To install a new bearing, coil the bearing to a size smaller than the inside
diameter of the adapter and insert it into the proper location.
6. Push the actuator stem into the adapter to help properly seat the bearing.
7. Using your finger, ensure that the bearing is properly seated. Visually
inspect the seating.
Figure 15 - Valve Stem Removal
Figure 16 Stem Removal
Figure 17 - Adapter O-rings and Bearing