Grundfos Peerless Pump 8196 Series, Installation, Operation And Maintenance Manual

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SECTION V
STP/MTP POWER FRAMES
V-A. DISASSEMBLY AND REASSEMBLY INSTRUCTIONS
REQUIRED TOOLS
Proper methods to handle pump components must always be used to avoid physical injury or damage to parts.
Lock out power supply to motor, dose off suction and discharge valves. Drain liquid from casing and flush if
required. Carefully, disconnect all accessory piping, remove coupling guard and disconnect coupling. Remove
complete pump assembly or back pull out, (power frame with adapter, box cover and impeller attached), by
removing frame adapter to casing bolts, (item 370). Using suitable lifting device, place pump, or back pull out
assembly, on dean work surface of adequate strength to support the weight.
STP/MTP PUMP. FRAMES
(a) Secure pump/back pullout assembly, to work bench.
(b) Drain oil from bearing frame by removing oil drain plug (408A). Replace drain plug and dispose of. used oil
in an environmentally appropriate manner.
(c) Scribe line on pump shaft at end of coupling hub and proceed to remove hub from shaft.
(d) Remove impeller (101), do not apply heat. Use impeller shaft wrench #96A3038F-056 for STP and MTP frames.
For LTP and XLTP frames use a spanner wrench or another suitable tool that will not mark the shaft. Slide
wrench over shaft (122) and key (400). Turn impeller clockwise (viewed from impeller end of shaft), to raise
wrench off work bench. Abruptly, turn impeller counterclockwise to impact wrench against workbench or
block of wood. Repeat as necessary until impeller loosens on shaft threads. Spin off impeller and discard O-
ring seal (496A).
REMOVAL OF STUFFING BOX COVER·MECHANICAL SEAL PUMPS
(e) Remove seal gland stud nuts (353A). Separate seal gland (250), and slide gland toward bearing isolator
(333A).
Remove seal chamber stud nuts (423B).
To remove seal chamber (184), slide chamber forward and off pump shaft.
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WARNING