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Waukesha Cherry-Burrell
Actuator O-ring and Bearing
Replacement
NOTE: The bearing will be damaged during
removal and must be replaced with a new
bearing.
A. Control Top
B. Cylinder Assembly
C. Bearing
D. O-ring
E. Cap Screw
F. Yoke
G. Indicator Stem
H. Spring Cage Assembly
I. Mounting Cup
J. Main Piston
K. Small Spring
L. Adjusting Sleeve
M. Upper Seat Lifting Piston
N. Adjusting Nut
August 2008
CAUTION: The valve stems and actuator must be removed from the valve
body before servicing the actuator components.
1.
See "Disassembly of Valve Stems" on page 18.
2.
Remove the Control Top. See "Control Top Removal and Disassembly" on
page 22.
3.
Remove the cap screws (Figure 22, item E) and yoke (item F) from the cyl-
inder assembly. Set the yoke aside.
4.
Pull the spring cage assembly (item H) and main piston (item N) from the
cylinder assembly.
5.
Inspect the o-rings (item D). Replace them if they are worn or damaged.
6.
Inspect the bearings (item C). If the bearing does not extend slightly above
the edge of the metal surface, replace the bearing.
7.
The bearing is split to allow it to be removed from the groove. Place a screw
driver behind the bearing and pry it away from the wall of the yoke. A nee-
dle-nose pliers can be used to grip the bearing for removal.
8.
Assemble the stack components as shown in Figure 22. Install the yoke and
cap screws.
Figure 22 - Actuator Assembly
95-03076
Maintenance
Page 21
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