Xylem NPOPTM NPO Product Training Manual - Manual (Page 25)

PAGE 25
Commercial Water
Goulds Water Technology
8.4 Disassembly of liquid end
8.4.1 Remove casing bolts.
8.4.2 Remove back pullout assembly from casing.
8.4.3 Remove cap at opposite end of motor. A screwdriver slot or a pair of flats will be exposed. Use
screwdriver or vise grips to stop shaft rotation.
8.4.4 Remove impeller lock nut by turning clockwise.
8.4.5 Remove impeller by turning clockwise.
8.4.6 With two pry bars 180º apart and inserted between the seal housing and the motor
adapter, carefully separate the two parts. The mechanical seal rotary unit should
come off the shaft with the seal housing.
8.4.7 Push out the mechanical seal stationary seat from the motor side of the seal
housing.
9.0 REASSEMBLY
9.1 All parts should be cleaned before reassembly.
9.2 Refer to parts list to identify required replacement items. Specify pump catalog number when ordering
parts.
9.3 Reassemble the pump in the reverse order of disassembly.
9.4 Observe the following when reassembling the liquid-end:
9.4.1 All mechanical seal components must be in good condition or leakage may result. Replacement of
complete seal assembly, whenever seal has been removed, is good standard practice.
It is permissible to use a light lubricant, such as glycerin, to facilitate assembly. Do not contaminate
the mechanical seal faces with the lubricant.
9.4.2 Inspect the casing o-ring and replace if damaged. This o-ring may be lubricated with petroleum jelly
to ease assembly.
9.4.3 Tighten the casing bolts in a star pattern (like tightening a drum head) to apply even pressure and
avoid cocking.
9.5 Check reassembled unit for binding and correct as required.
INSTALLATION PROCEDURES