Xylem IM007 R05 Models 3642/3742 - Manual (Page 6)

6
Seasonal Service:
To REMOVE pump from service, remove drain plug
and drain all unprotected piping.
To RETURN pump to service, replace drain plug using
Teflon™ tape or equivalent.
Reconnect suction line if removed, examine union and
repair if necessary.
Refer to “OPERATION” section of manual.
DISASSEMBLY
Follow ALL warnings and instructions in the “MAINTE-
NANCE” section of this manual.
Close-coupled units: Remove motor hold-down
bolts.
Frame-mounted units: Remove coupling guard,
spacer, coupling and frame hold-down bolts.
Liquid End:
1. Remove casing bolts (370).
2. Remove back pull-out assembly from casing (100).
3. Remove casing gasket (351). Discard.
4. On close-coupled units, remove motor end plug or
cover to expose screwdriver slot or flats on end of
motor shaft.
5. While restraining shaft with an appropriate tool
(close-coupled units) or with a strap wrench
(frame-mounted units) remove impeller nut (304)
by turning COUNTERCLOCKWISE. Impeller nut
may need to be heated with torch to remove.
NOTICE: EXERCISE CAUTION WHEN HANDLING
HOT IMPELLER NUT.
6. While restraining shaft, remove impeller (101) by
turning COUNTERCLOCKWISE. Impeller may
need to be heated to remove.
NOTICE: EXERCISE CAUTION WHEN HANDLING
HOT IMPELLER.
7. Using two screwdrivers, pry off rotating section of
mechanical seal assembly (383), discard. See
Figure 7.
Figure 7
8. Remove adapter bolts (371) and adapter (108),
pulling with it the mechanical seal stationary seat.
9. Push out the mechanical seal stationary seat from
the motor side of the adapter. Discard.
Bearing Frame:
1. Remove bearing cover (109).
2. Remove retaining ring (361).
3. Remove shaft assembly from frame.
4. If worn or damaged, remove lip seals (138, 139)
from bearing frame (228) and bearing cover (109).
6. Use bearing puller or arbor press to remove ball
bearings (112, 168).
REASSEMBLY
All parts should be cleaned before assembly.
Refer to parts list for description of replacement items.
Specify pump index number when ordering parts.
Bearing Frame:
1. Replace lip seals if removed.
2. Replace ball bearings if loose, rough or noisy
when rotated.
3. Check shaft (122) for runout. Maximum permis-
sible is 0.002” (0.051 mm) TIR.
Liquid End:
1. Inspect shaft removing any debris or burrs.
2. Treat shaft threads with LOCQUIC
® Primer “T”, or
equivalent, following manufacturer’s instructions
carefully.
NOTICE: MECHANICAL SEAL MUST BE REPLACED
WHENEVER SEAL HAS BEEN REMOVED.
FOLLOW SEAL MANUFACTURER’S
INSTRUCTIONS CAREFULLY.
3. Stationary seal seat may be dipped in water or
glycerin to ease installation. Place stationary
seal seat squarely into adapter seal bore. Cover
the polished face of the seat with a thin piece of
cardboard or paper towel. Press seat firmly into
bore using a round piece of plastic or wood that
disperses the force over the entire seal face.
4. Place adapter, concave face pointing up, over
motor shaft and lower it onto the motor adapter.
Exercise care in that the motor shaft does not
dislodge or damage seal seat.
5. Fully and squarely install the rotary assembly of
seal against the stationary seat.
6. Apply LOCTITE ® #262 or equivalent, to shaft
threads and install impeller on shaft by turning
CLOCKWISE until it bottoms on the motor shaft.
7. Apply LOCTITE ® #262 or equivalent, to impeller
nut and tighten to 20 lbs. ft. (27 N•m).
8. Replace casing gasket.