Xylem AC2008B Series HSC3 Base Mounted Centrifugal Pump - Manual (Page 18)

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3. Lubricate and roll the O-ring into the groove in the gland
plate.
IMPORTANT: Steps 4 and 5 must be completed within
10 to 12 minutes to assure proper placement of the mech-
anical seals.
4. Lightly coat the outboard end of the pump shaft with P-80
Rubber Lubricant Emulsion, vegetable oil, or equal and
slide the mechanical seal head onto the shaft. Do not
compress the seal spring at this time.
CAUTION: USE A FLASHLIGHT AND MAKE SURE THE
MECHANICAL SEAL SPRING IS SEATED PROPERLY
INTO THE SPRING HOLDER AND AROUND THE
BELLOWS OF THE MECHANICAL SEAL BEFORE
CONTINUING.
5. Slide the gland plate, over the shaft, being very careful
that the head and the seat of the mechanical seal do not
get damaged. Then press the gland plate with the O-ring
into the stuffing box and tighten the socket-head
capscrews.
NOTE: Because of the compression of the O-ring, it may
be difficult to press the O-ring into the stuffing box. Use
longer socket-head capscrews to start the gland plate
into the stuffing box. Draw-up the bolts evenly until the
gland plate is secure in the stuffing box. To prevent the
mechanical seal spring from pushing the gland plate back
out of the stuffing box, remove one long socket-head
capscrew at a time and replace with a regular socket-
head capscrew.
6. Heat the ball bearings using dry heat or 10% – 15%
soluble oil and water, or an induction heater.
CAUTION: DO NOT EXCEED A TEMPERATURE OF 275°F.
7. Fill up the lip seal cavity with approximately .50 ounces of
grease.
8. Using gloves, slide the heated bearing onto the shaft
against the shaft shoulder. (See Photo 5)
9. Install the locknut and lockwasher on the outboard end of
the shaft. Make certain that the locknut is secure and
bend over the tabs on the lockwasher. (See Photo 6)
10. Allow the bearing to cool to room temperature. Coat the
exposed sides of the bearing with two or three ounces of
recommended grease.
11. Coat the inside of the bearing housing with grease and
slide it into place over the bearing. Alternately tighten the
bearing housing capscrews so as not to “cock” the bear-
ing housing causing bearing to bind.
12. Repeat steps 1 through 11 for the inboard.
NOTE: A locknut and lockwasher are not installed on the
inboard end of the pump shaft.
13. Reinstall the coupler and check for alignment, following
the instructions on page 8. Install the coupler guard
(Refer to page 7).
Dismantling the Pump when it is required to remove
the Rotating Element of the Pump
1. Close valves on suction and discharge sides of pump. If
no valves have been installed, it will be necessary to drain
the system.
2. Remove the coupler guard. For spacer couplers, loosen
the capscrews which secure the coupler flanges to the
coupler hubs. Remove the coupler flanges and sleeve by
compressing the flanges and pulling out from beneath the
hubs or by loosening the allen set screws and sliding the
hubs back on the shafts. Remove the coupler hub from
the pump shaft. For non-spacer couplers, loosen allen set
screws and slide flanges back on shafts and remove
rubber element.
3. Remove all casing main joint capscrews and dowel pins.
4. Tighten the jacking screws in the upper half of the casing
to separate the upper and lower casing halves. Then lift
off the upper half of the casing.
Photo 5 – Installation of bearing
Photo 6 – Installation of lockwasher and locknut
CAUTION: Extreme Temperature Hazard
Allow pump temperatures to reach acceptable levels
before proceeding. Open drain valve, do not proceed until
liquid stops coming out of drain valve. If liquid does not
stop flowing from drain valve, isolation valves are not seal-
ing and should be repaired before proceeding. After liquid
stops flowing from drain valve, leave drain valve open and
continue. Remove the drain plug located on the bottom of
the pump housing. Do not reinstall plug or close drain
valve until reassembly is completed. Failure to follow these
instructions could result in property damage and/or moder-
ate personal injury.
WARNING: Unexpected Start-up Hazard
Disconnect and lock out power before servicing.
Failure to follow these instructions could result in serious
personal injury or death and property damage.