Maintenance
Waukesha Cherry-Burrell Brand W71/W72RS Sch. 5 Mix Proof Valves
Page 36
95-03091
08/2018
Removal of O-rings and Bearings, Seat Lifting
Actuators
NOTE:
For larger drawings and complete partlists, see “W71
Schedule 5 Mix Proof Seat Lift Valve Actuator” on page 50 and
“W72RS Schedule 5 Mix Proof Seat Lift Valve Actuator” on
page 54.
1. For seat lifting valves, remove the cap screws (Figure 37,
item 9) and remove the lower cartridge (yoke, item 12;
adjusting nut, item 20; adjusting sleeve, item 24; and upper
seat piston, item 23).
Maintenance Video 14: Actuator disassembly; lower
cartridge removal
2. To disassemble the cartridge, remove the adjusting nut (item
20) and separate the parts.
Maintenance Video 15: Adjusting Nut removal
3. Remove the small spring (Figure 37, item 18). On W71
valves, also remove the bushing (Figure 36, item 28).
4. Pull out the upper cartridge (main piston, item 22; lower seat
spring and piston, item 10), by carefully threading in the lower
stem to pull it. Do not bend the lower stem.
Alternate method: Flip the canister right-side up and gently
tap it on the table (or push down the indicator stem) until the
air vacuum releases and the upper cartridge slides out the
open end.
Maintenance Video 16: Removal of main piston, lower seat
lift piston
5. Inspect the nine O-rings (Figure 37, items 6, 7, 8, 11, 17, 25,
26, and 29) and replace them if they are worn or damaged.
6. Inspect the five bearings on W71 (Figure 37, items 5, 14, 15,
16, and 21) or four bearings on W72RS actuators (items 5,
14, 15, and 16). If the bearing does not extend slightly above
the edge of the metal surface, replace it.
7. The bearing is split to allow its removal from the groove.
Place a screwdriver or pick behind the bearing and pry it
away from the wall of the yoke. A needle-nose pliers can be
used to grip the bearing for removal.
NOTE:
The bearing will be damaged during removal and must be
replaced with a new bearing.
8. Assemble the stack components as shown. Make sure that
the upper cartridge components are fully inserted. Install the
yoke and adjustment nut.
NOTE:
Figure 37 - W71 Sch. 5 Actuator
Assembly (Seat Lift Valve)
4
19
18
8
23
16
15
20
25
29
11
17
7
9
24
26
12
VA100-714
14
28
22
19
10
30
1, 1a
5
6
13
Maintenance Video 17: Main piston
O-ring removal
Maintenance Video 18: Main piston
O-ring replacement with bearing
Maintenance Video 19: Can top
bearing and O-ring; removal and
replacement
Maintenance Video 20: Main piston
bearing
Maintenance Video 21: Lower seat
lift piston reassembly
Maintenance Video 23: Reassembly
of actuator: spacers and inner
spring
Maintenance Video 24: Reassembly
of lower cartridge O-rings and
bearings
Maintenance Video 25: Re-
installation of lower cartridge