Specifications Information and Repair Parts Manual
3826-99
3824-253-00 2
2/2015
2-Inch Thermoplastic Dewatering Pedestal Pump
BEARING HOUSING SERVICE
1. Remove front pump assembly as described under “Mechanical Seal
Replacement”
2. Remove shaft bearing (Ref. No. 3) and shaft (Ref. No. 4) as an
assembly by first removing snap ring (Ref. No. 1). Push shaft bearing
assembly out of pedestal (Ref. No. 6) by rapping on threaded end of
shaft with a rawhide mallet, or block of wood and a hammer.
3. Ball bearings can now be removed from shaft.
4. If shaft bearings have been removed from shaft, replace by sliding
bearing on shaft to shoulder. Replace shaft bearing assembly by
sliding assembly into housing threaded end first. Push shaft bearing
assembly completely in by gently tapping on keyway end of shaft with
a rawhide mallet. Replace snap ring.
5. Reassemble pump as described in “Mechanical Seal Replacement”.
SHIM ADJUSTMENT
When installing a replacement impeller (Ref. No. 25) or mechanical
seal (Ref. Nos. 27 & 28), it may be necessary to vary the number of
shims (Ref. No. 32) that will be required. This is easily done by adding
one 0.010" shim more than was removed, and reassembling pump as
described.
Ensure that volute (Ref. No. 15) is snugly in place and check shaft to
make sure it is turning freely. If it turns freely, check to ensure that
adapter (Ref. No. 9) and volute are fitted tight together. If they are not,
tighten fasteners (Ref. Nos. 15 & 23) and recheck shaft for free
turning. Tighten carefully, turning shaft while tightening. If shaft seizes
before fasteners are completely tight, disassemble pump and remove
one shim and repeat reassembly.
If any time during above operation shaft does not turn free, follow
procedure indicated above and repeat procedure.
Above procedure ensures that pump will have proper running
clearance (less than 0.010") between impeller and casing and perform
like a new unit with new impeller or motor.
7.
Press seal seat squarely into recess in impeller. If seal seat
does not press squarely into recess, it can be adjusted by
pushing on it with a piece of pipe. Always use a piece of
cardboard between pipe and seal seat to avoid scratching
lapped, highly polished surface of seal seat (handle it
carefully).
8.
After seal seat is in place, ensure that it is clean and has not
been marred.
9.
Using a clean cloth, wipe shaft and make certain that it is
completely clean.
10.
Place adapter seal (O-ring) onto seal head behind flange and
press assembly into adapter as shown in Figure 2.
Do not touch or wipe polished face of seal head.
11.
Secure adapter on pedestal mounting face, using fasteners
and fastener seals. Be sure to replace gasket (Ref. No. 8)
between pedestal and adapter, if removed during
disassembly.
Tighten adapter fasteners evenly to avoid cocking or damaging
adapter.
12.
Replace impeller and shims, ensuring that key (Ref. No. 26)
is in place and lock impeller to shaft with fastener and
impeller seal on fastener.
13.
Replace volute seal and volute with fasteners, ensure that
check valve (Ref. No. 16) is in place then remount casing seal
and pump casing with fasteners and nuts.
IMPORTANT:
Always inspect all seals when unit is disassembled.
Replace when rubber is hard, cracked, or worn. When reassembling
parts with O-ring seals or gaskets, it is sometimes helpful to apply a
small amount of soapy water on O-ring so that parts slide over O-ring
without pinching or shaving it.
Figure 2 – Mechanical Seal Replacement
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