Discharge Piping; Rotation; Operation; Maintenance - Xylem GOULDS HMS Manuel D'installation

4. Discharge Piping

4.1 Allowance should be made for disconnecting discharge
piping near casing to allow for pump disassembly.
4.2 Arrangement must include a check valve located
between a gate valve and the pump. The gate valve
is for regulation of capacity, or for inspection of the
pump or check valve.
4.3 If an increaser is required, place between check valve
and pump.
4.4 Use 3-4 wraps of Teflon tape to seal threaded
connections.

5. Rotation

5.1 Correct rotation is right-hand (clockwise when viewed
from the motor end). Switch power on and off quickly.
Observe shaft rotation. to change rotation:
5.1.1 Single-phase motor: Non-reversible
5.1.2 Three-phase motor: Interchange any two power
supply leads.

6. Operation

6.1 Before starting, pump must be primed (free of air and
suction pipe full of liquid) and discharge valve partially
open.
6.2 Make complete check after unit is run under operating
conditions and temperature has stabilized. Check for
expansion of piping.

7. Maintenance

7.1 Ball bearings are located in and are part of the mo-
tor. They are permanently lubricated. No greasing
required.
CAUTION: PUMPED LIQUID PROVIDES
LUBRICATION. IF PUMP IS RUN DRY,
ROTATING PARTS WILL SEIZE AND
MECHANICAL SEAL WILL BE
DAMAGED. DO NOT OPERATE AT OR
NEAR ZERO FLOW . ENERGY IMPARTED
TO THE LIQUID IS CONVERTED INTO
HEAT. LIQUID MAY FLASH TO VAPOR.
ROTATING PARTS REQUIRE LIQUID TO
PREVENT SCORING OR SEIZING.

8. Disassembly

8.1 Complete disassembly of the unit will be described.
Proceed only as far as required to perform the
maintenance work required.
8.1.1 Turn off power.
8.1.2 Drain system and flush if necessary.
8.1.3 Disconnect discharge pipe from pump.
8.1.4 Remove motor hold-down bolts.
8.2 Disassembly of liquid end
8.2.1 Drain the pump body through the drain plug (4).
8.2.2 Remove the casing screws (1) from the motor
adapter (17).
8.2.3 Remove the pump body (2) and the o-ring (15)
located between the pump body and the seal
housing (16).
8.2.4 Remove motor fan cover (24) to expose wrench
flats or slot on shaft end.
4
CAUTION: DO NOT INSERT SCREWDRIVER
BETWEEN THE FAN BLADES TO
PREVENT ROTATION.
8.2.5 Hold motor shaft at flat or slot to resist rotation
and remove impeller nut and washer (5, 6).
8.2.6 The following parts can now be removed from
the pump shaft in sequence: Diffuser with o-ring (7,
9), impeller spacer (8),impeller (10), impeller spacer
(8), etc. until the complete "hydraulic element" is dis-
mantled. Note: Each diffuser contains an o-ring (9).
8.2.7 Remove the shoulder washer (13) from the
pump shaft (18).
NOTE: Further disassembly will require removal of the
mechanical seal. It is recommended that a new
mechanical seal be installed at reassembly.
8.2.8 Carefully pull the rotary portion of the mechani-
cal seal (14) from the shaft coupling (19).
8.2.9 Remove the seal housing (16) from the motor
adapter. The stationary portion of the mechanical seal
(14) can now be removed from the seal housing.
8.2.10 Remove the motor screws (21) from the motor
adapter and remove the motor adapter from the motor.
8.2.11 To remove the pump shaft (18) from the shaft
coupling (19), heat must be applied to the small end
of the shaft coupling. This is required to break the
bond of the Loctite #271 between the pump shaft and
coupling.
CAUTION: DO NOT DAMAGE THE SMALL END OF
THE SHAFT COUPLING WHERE THE
MECHANICAL SEAL SITS.
Hold the motor shaft at flats or slots to resist rotation.
Repeat for removal of the shaft coupling from the mo-
tor shaft, this time heating the large end of the shaft
coupling.

9. Reassembly

9.1 All parts should be cleaned before reassembly. Remove
all cured Loctite from parts using denatured alcohol
and wire brush. Allow parts to dry before reassembly.
9.2 Refer to parts list to identify required replacement
items. Specify pump index or catalog number when
ordering parts.
9.3 Reassembly is the reverse of disassembly.
NOTE: The impeller spacers must be assembled with the
larger diameter edge adjacent to each impeller.
The last stage diffuser (12) can be identified from
the standard by the holes around its circum-
ference,it is recommended that one of these holes
be lined up with the discharge port. Fix the
hydraulic element by tightening the impeller screw
(5) and impeller washer (6) with a torque setting
of 10 ft. Position the o-ring (15) on the
mechanical seal housing (16), locate the pump
body (2) and fit it to the motor adapter (17) with
the four screws (1).
Observe the following when reassembling the pump:
9.4 Check for motor shaft runout. Maximum permissible
is .002" TIR.
9.5 Apply Loctite 'Primer 7649' and allow 2-3 minutes to
dry. Next apply Loctite #271 to motor shaft, thread
coupling shaft in place and torque to 15 ft. of torque.
9.6 Apply Loctite 'Primer 7649' and allow 2-3 minutes to
dry. Next apply Loctite #271 to pump shaft. Thread
pump shaft in place and torque to 15 ft. of torque.