Xylem P81630E Series VSC and VSCS Base Mounted Centrifugal Pumps - Manual (Page 9)

9
TO REPLACE THE SEAL OR SHAFT SLEEVE:
4. Remove flush tube and tube fitting from seal housing
inside bearing bracket.
5. Remove bearing bracket capscrews and bearing cover
capscrews inside the bracket.
6. Remove bearing bracket using capscrews in jackscrew
holes. DO NOT PULL BEARING COVER.
7. Remove bearing locknut by straightening tab of lockwasher
from notch in locknut and turning locknut counterclockwise.
8. Remove lockwasher and pull bearing from shaft.
9. Remove retainer ring from shaft, except on 12 x 14 x 17
1 /
2
.
10. Now remove bearing cover.
11. Remove capscrews from seal housing. Remove outer two
set screws from shaft sleeve drive collar and loosen two
inner set screws one turn.
12. Remove the sleeve and seal assembly from the shaft by
pulling on the seal housing.
13. To assemble the pump, clean shaft sleeve and pump shaft.
Replace shaft sleeve if pitted or scored. If replacing the
seal, remove shaft O-ring and replace (included in seal kit).
NOTE: If installing -D seals refer to steps 10-12 on -D
instructions then skip to 17.
14. Lubricate O-ring on stationary seal seat (carbon) with sili-
cone grease or soapy water. DO NOT USE PETROLEUM
LUBRICANT! Position in seal housing. Place shaft sleeve
in drive collar and tighten the two dog point set screws in
holes provided. Set shaft sleeve and drive collar assembly
on end and place assembly aid spacer around shaft
sleeve. Position against drive collar.
15. Place seal housing with carbon over the end of the sleeve
against assembly aid spacer.
16. Lubricate O-ring in rotating seal assembly with silicone
grease or soapy water. DO NOT USE PETROLEUM
LUBRICANT! Slip rotating seal assembly on the end of the
sleeve and place against carbon.
17. Compress rotating seal assembly to a 1 /
4
" space between
the seal parts that house the compression springs. Tighten
set screws.
18. Apply anti-seize compound only to the area of the shaft
that will be under the sleeve. Place seal housing gasket in
position and slide complete assembly over pump shaft.
19. Slide bearing cover on shaft. Replace snap rings (if used)
clean and regrease bearings. Place on shaft. Lock in place
with lockwasher and locknut. Install bearing bracket and
bearing cover.
20. Push on the drive collar until the seal housing is against
the coverplate. Bolt into place.
21. Tighten down collar set screws in undercut of shaft.
Remove assembly aid spacer and connect flush tubing to
seal housing.
22. Replace drain plug.
23. Install coupler and align, following the instructions located in
the section titled “Coupler Alignment.”
24. Install coupler guard. Refer to separate instructions
titled “Hex Coupler Guard Removal/Installation.”
25. Open isolation valves and check pump for leaks. If not
leaking, return pump to service.
WARNING: Excessive Pressure Hazard
Make certain internal pressure is relieved before con-
tinuing. Failure to follow these instructions could result in
serious personal injury or death, or property damage.
13. Install the second seal carbon. Lubricate and insert
second stationary O-ring toward cap. Replace seal cap.
14. Apply anti-seize compound only to the shaft that will be
under the sleeve.
15. Place the stuffing box gasket onto the bracket and install
assembly into the coverplate. Position sleeve drive collar
outer holes over undercut in shaft and tighten set screws.
Install the bearing housings.
IMPORTANT! When working on the seal on the non-
coupler end, it is necessary to force the pump shaft back
from the coupler end as far as possible and to hold it in
this position while installing and locking the bearing to the
shaft. Also, when replacing both seals, the seal on the
non-coupler end of the pump should be installed first.
16. Clean and regrease the bearings and insert into bearing
housings. Push the pump shaft back from the motor end as
far as possible, using a lever if necessary. Hold the shaft in
this position. On the outboard bearing tap inner race until it
is properly positioned against the shaft shoulder. Install
and lock the cam lock into position. If the shaft and bear-
ing are properly positioned, the cam lock set screw will fall
in the center of the shaft undercut. Release the shaft.
Install the outboard bearing cap. Install the inboard bear-
ing by tapping the inner race until it contacts the shaft
shoulder, lock the bearing in place with the cam lock.
Install the inboard bearing cap.
17. Replace drain plug.
18. Install coupler and align per instructions located in the
section titled “Coupler Alignment.”
19. Install coupler guard. Refer to separate instructions titled
“Hex Coupler Guard Removal/Installation.”
20. Open isolation valves and check pumps for leaks. If not
leaking, return pump to service.
NOTE: Flushing pressure must be the suction pressure on
the pump plus 10 PSI.
SPECIAL INSTRUCTIONS FOR PUMPS (VSCS, VSC-S & VSCS-D)
10 x 12 x 17, 12 x 14 x 12 1 /
2
and 12 x 14 x 17 1 /
2