Xylem P81875F Series HSC and HSC-S Centrifugal Pump - Manual (Page 18)

1. Mechanical Seals on Shaft

DISASSEMBLY

NOTICE: Numbers that appear in parenthesis ( ), such as
(1-939-9), may be used to order replacement parts.
1. Close valves on suction and discharge sides of pump. (If
no valves have been installed, it will be necessary to drain
the system.)
1 8
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.
Photo 1 – Assembly Section: Pump With Mechanical Seals on Shaft
Photo 2 – Pump with Mechanical Seals 
Impeller rings can be added–
Optional Extra.
IMPELLER WEAR RING
Optional Extra.
BALANCED
MECHANICAL SEAL
NOTE:
Standard mechanical seal pip-
ing can be modified for filter or
external flushing arrangement.