Xylem IM191 R03 Marlow Series Prime Line Self-Priming Centrifugal Pumps - Manual (Page 9)

9
SHAFT AND BEARING REPLACEMENT (E-Series)
If shaft or bearing replacement is necessary, follow these
instructions. (Shut down the pump and disconnect power
supply to the pump before working on pump.)
1. Install the front (impeller end) bearing (36) on
the shaft (38).
2. Slide the carrier retaining ring (106) onto the
shaft (38) over the coupling end.
3. Install the rear (coupling end) bearing (117) on
the shaft (38).
4. Install the retaining ring (108) onto the shaft (38).
Add shims (107) between the retaining ring (108)
and the rear bearing (117) if required to lock the
rear bearing (117) on to the shaft axially.
5. Install O-ring (109) into the O.D. groove of the
bearing carrier (110).
6. Slide the bearing carrier (110) with o-ring over the
rear bearing such the rear bearing slides into the
bearing carrier (110). Install the retaining ring (106)
in place inside bearing carrier.
7. Insert shaft assembly with bearings and carrier into
the housing (31).
SEAL INSTALLATION INSTRUCTION
Seal is precision made. Handle carefully. Do not scratch
seal face.
1. Remove old seal. Clean shaft and all seal cavity
surfaces thoroughly.
2. Coat carbon washer, inside surface of rubber boot,
and rubber o-ring with a clean oil film.
3. Push stationary assembly into cavity, seating it
firmly and squarely with finger pressure only. DO
NOT use screwdriver or any tool which might
damage the stationary assembly.
4. Slide bellows assembly on shaft as far as possible,
pushing against rubber tail section only. Ease
bellows assembly into place. DO NOT DRIVE
WITH A HAMMER.
5. Install bellows spring with one end on flange of metal
seal flange. Some seal assemblies use a tapered spring.
On these, the smaller diameter fits on metal seal
flange.
6. Complete assembly of other pump parts.
A short “run-in” period may be necessary to provide a
tight seal joint.
CAUTION: Never run a seal dry for any length of time.
NOTE: Please make note that all “P” Series pumps are
equipped with shaft sleeve.
SHAFT SLEEVE INSTALLATION (2P, 3P, 4P ONLY)
Follow these instructions when applying loctite between
the shaft sleeve and shaft surface.
(a) Surface to be coated with loctite must be free of dirt
and grease. Wash with degreasing solvent if necessary.
(b) Spray these surfaces with loctite primer type “T”.
DO NOT OVERSPRAY. The thinnest film of primer
is best. Avoid skin contact or repeated breathing of
primer vapor. Allow three to four minutes for primer
to dry.
(c) Apply a coat (.005" or less thick) of loctite 271 (red)
to both shaft and inside of shaft sleeve.
(d) Slide shaft sleeve over the shaft all the way against
shaft shoulder. Make sure the chamfer on the I.D.
of the shaft sleeve is towards the shaft shoulder not
towards the impeller. Allow 5-10 minutes to cure if
primer type “T” is used, or 10-15 minutes if primer is
not used to attain full strength of loctite.
NOTE:
1. An evenly applied coat of loctite on both surfaces
will prevent leakage under shaft sleeve.
2. To remove shaft sleeve heat sleeve surface to
300º-350ºF with heat gun and tap gently on sleeve
to remove.
CHECK VALVE REPLACEMENT
To remove suction check valve follow these steps:
(a) Disconnect suction piping from suction inlet (50).
(b) Remove complete assembly, which includes suction
inlet (50) and check valve assembly.
(c) Remove shoulder bolts (54) to remove check valve
keeper plate (53) and rubber check valve (51).
If any of the parts of the check valve assembly are
damaged i.e. suction inlet (50), check valve (51), shoulder
bolt (54) and keeper plate (53), replace. Make sure the
sealing surface on suction inlet (angled surface) is not
damaged.
NOTE: Latest design check valve uses shoulder bolt (54)
instead of stud, space tube, locking nut, and washer.
Follow above procedure in reverse to reassemble the
pump.
NOTE: Make sure all gaskets, o-ring, rubber check
valve and seal assembly are in good condition before
reassemby. Replace as is necessary.
WINTER STORAGE
1. Wash off exterior of pump.
2. Flush suction line, discharge line, pump casing,
impeller and diffuser of all solids by pumping clear
liquid for a short time.
3. Drain pump casing, suction line and discharge line.
4. If complete draining is impossible add small amount
of anti-freeze into the pump casing. Rotate shaft for
mixing.
5. If the bearings are oil lubricated drain the old oil
from bearing housing and refill housing cavity with
proper grade of oil. (Refer to Maintenance section).
6. Seal off suction and discharge ports of pump casing.
7. Store the units in dry clean area if possible.
8. Motor windings should be protected from excessive
moisture. Follow motor manufacturer’s instructions.
9. Spray interior of pump casing with commercially
available anti-rust and anti-corrosion petroleum
aerosol.
10. Once a month rotate the pump shaft during storage
if possible.