Xylem 8100 Series Centrifugal Pumps AC2515 REV.C - Manual (Page 31)

SERVICE
DISASSEMBLY AND REASSEMBLY
PROCEDURES
The procedures outlined in this section cover the
dismantling and reassembly of three different
types of 8100 Series pump construction.
A. 8100 Series pump with packing.
B. 8100 Series pump with mechanical seals
on shaft.
C. 8100 Series pump with mechanical seals
on shaft sleeves.
Each procedure provides the step-by-step
instructions for dismantling and then reassembling
the pump, depending upon the type of shaft seal
used.
When working on the pump, use accepted
mechanical practices to avoid unnecessary
damage to parts. Check clearances and conditions
of parts when pump is dismantled and replace if
necessary. Steps should usually be taken to
restore impeller and casing ring clearance when it
exceeds three times the original clearance.
If your pump has adjustable wear rings, please
refer to the instructions on page 48.
CAUTION:
For pumps in the vertical configuration,
(Models 200 and 300) please follow the
instructions for the disassembly and reassembly
of a vertical rotating element on page 49.
CHANGING ROTATION
WARNING: Unexpected Startup Hazard
Disconnect and lockout power before
servicing. Failure to follow these instructions could
result in serious personal injury or death, or
property damage.
WARNING: Electrical Shock Hazard
Electrical connections to be made by a
qualified electrician in accordance will all
applicable codes, ordinances, and good practices.
Failure to follow these instructions could result in
serious personal injury or death, or property
damage.
WARNING: Rotating Components
Hazard
Do not operate pump without all guards in place.
Failure to follow these instructions could result in
serious personal injury or death and property
damage.
8100 Series centrifugal pumps can be operated
clockwise or counterclockwise when viewed from
the coupling end of the pump. If you wish to
reverse the suction and discharge nozzles; i.e.,
change rotation, this can be accomplished with the
same pump as follows:
1. Remove the impeller from the shaft, turn it
180° and replace it on the shaft. (Follow
the disassembly procedures given in this
manual.)
2. With the rotating element out of the
casing, remove the casing from the base
and turn 180°. (Factory bases are drilled
for both rotations.)
3. Set the rotating element back in the
casing and reassemble the pump.
NOTE: The impeller and casing are in the same
relationship to each other as they were originally.
The shaft and motor are also in the same
relationship to each other as they were originally.
4. Reassemble the pump and realign the
coupling as called for in the alignment
instructions.
5. The rotation of the motor must be
changed by switching the motor leads.
NOTE: Unless the motor rotation is reversed the
impeller will run backward.
31