SPX W Series User Manual

Waukesha Cherry-Burrell Maintenance
10/2012 95-03087 Page 29
Removal of O-rings and Bearings, Seat Lifting
Actuators
NOTE: For larger drawings and complete partlists, see “W71/
W73 Seat Lift Actuator” on page 78 and “W72RS/W72RSP Seat
Lift Actuator” on page 82.
1. For seat lifting valves, remove the cap screws (Figure 27,
item 9) and remove the lower cartridge (yoke, item 12; adjust-
ing 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 27, item 18). On W71/W73
valves, also remove the bushing (Figure 26, 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 17: Main piston o-ring removal
Maintenance Video 18: Main piston
o-ring replacement with bearing
5. Inspect the nine o-rings (Figure 27, items 6, 7, 8, and 11) and
replace them if they are worn or damaged.
Maintenance Video 19: Can top
bearing and o-ring; removal and
replacement
6. Inspect the five bearings on W71/W73 (Figure 27, 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.
Maintenance Video 20: Main piston
bearing
7. The bearing is split to allow its removal from the groove.
Place a screwdriver 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.
Maintenance Video 21: Lower seat
lift piston reassembly
NOTE: The bearing will be damaged during removal and must be
replaced with a new bearing.
Maintenance Video 23: Reassembly
of actuator: spacers and inner
spring
8. For seat lifting valves, assemble the stack components as
shown. Make sure that the upper cartridge components are
fully inserted. Install the yoke and adjustment nut.
Maintenance Video 24: Reassembly
of lower cartridge o-rings and
bearings
NOTE: Installation of the piston and spring assembly on 4"
actuators requires a special sleeve to contain the bearing on the
piston while installing the assembly. See Figure 29 and Figure 28
on page 30.
Maintenance Video 25: Re-
installation of lower cartridge
Maintenance Video 22: Using insertion sleeve for W71/W73
Actuators
Figure 27 - W71/W73 Actuator Assembly
(Seat Lift Valve)
VA100-429
5
13
4
21
19
18
8
14
8
7
16
15
20
12
26
9
23
17
11
22
10
1,1a
25
29
30
6
31
24
28
33

SPX W Series Specifications

General

Brand	SPX
Model	W Series
Category	Control Unit
Language	English