Disassembly; Reassembly - Xylem Goulds 3656 Instrucciones De Instalación, Operación Y Mantenimiento

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 on male threads.
• 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, cou-
pling and frame hold-down bolts.
LIQUID END
1. Remove casing bolts (13).
2. Remove back pull-out assembly from casing (1).
3. Remove casing wear ring (4) if excessively worn.
NOTICE: DO NOT INSERT SCREWDRIVER BETWEEN
IMPELLER VANES TO PREVENT ROTATION.
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 bolt (6). Impeller bolt may need
to be heated with torch to remove. Discard.
NOTICE: EXERCISE CAUTION WHEN HANDLING
HOT IMPELLER BOLT.
NOTICE: FOR SAE DRIVE UNITS, REMOVE IMPELLER
NUT SET SCREW (22A) PRIOR TO
REMOVING IMPELLER NUT (22). IMPELLER
SET SCREW AND IMPELLER NUT MAY NEED
TO BE HEATED TO BE REMOVED.
6. Remove impeller washer (7).
7. Insert two pry bars, 180° apart, between impeller (2) and
seal housing (3). CAREFULLY pry off impeller.
8. Remove impeller key (8).
9. Remove seal housing bolts (14) and seal housing (3)
pulling with it the mechanical seal assembly. Discard seal
assembly and seal housing o-ring (9). For packed box
pumps see "PACKED BOX INSTRUCTIONS".
10. Remove adapter (108).
11. Inspect shaft sleeve (11). If badly scored, remove by
heating with torch. Discard.
12. Push out the mechanical seal stationary seat from the
seal housing. Discard.
13. On units equipped, remove seal housing wear ring (5)
if excessively worn.
DISASSEMBLY OF BEARING FRAME OR
SAE BEARING FRAME
1. Remove deflector (123) from shaft.
2. Remove bearing cover (134).
3. Remove shaft assembly from frame.
4. Remove lip seals (138, 139) from bearing frame (228) and
bearing cover (134) if worn. Discard.
5. Remove retaining ring (361).
6. Use bearing puller or arbor press to remove ball
bearings (112, 168).

REASSEMBLY

• All parts should be cleaned before assembly.
NOTICE: O-RING SHOULD BE REPLACED AFTER ANY
DISASSEMBLY OF UNIT.
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 permissible is
0.002" (0.05 mm) TIR.
4. Refer to the "MAINTENANCE" section of this manual
for M-group bearing frame regreasing instructions.
LIQUID END
1. Inspect shaft removing any debris or burrs.
2. Treat shaft with LOCQUIC
following manufacturer's instructions carefully.
3. When replacing shaft sleeve, spray new shaft sleeve's bore
with LOCQUIC Primer "T", or equivalent. Let parts dry
®
and then apply LOCTITE
Slide new sleeve over shaft with a twisting motion, wipe
off excess. Let cure according to instructions.
NOTICE: MECHANICAL SEAL MUST BE REPLACED
WHENEVER SEAL HAS BEEN REMOVED.
FOLLOW SEAL MANUFACTURER'S
INSTRUCTIONS CAREFULLY. FOR PACKED
BOX PUMPS SEE "PACKED BOX
INSTRUCTIONS".
4. Replace seal housing wear ring, if removed.
5. For mechanical seal pumps, stationary seal seat may be
dipped in water to ease installation. Place stationary seal
seat squarely into seal housing 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. NOTE: If mechanical seal is supplied with a
spring retainer, remove and discard the retainer.
6. Place adapter, concave face pointing up, over motor
shaft and lower it onto the motor.
7. Replace seal housing o-ring. This o-ring may be lubricated
with water or glycerin to ease in installation. Install seal
housing on adapter. Exercise care in that the motor shaft
does not dislodge or damage seal seat.
8. Fully and squarely install the rotary assembly of seal
against the stationary seat.
NOTICE: REPLACE IMPELLER BOLT AND WASHER
WHENEVER IMPELLER IS REMOVED.
9. Install impeller key in shaft keyway. Mount impeller on
shaft and push until it bottoms. Hold in place. For SAE
units, apply LOCTITE 271 to the impeller bore, keyway
and shaft. Mount impeller on shaft and push until it
bottoms. Hold in place.
10. Install new impeller washer. Impeller washer not used for
SAE units.
Primer "T", or equivalent,
®
#262 on the same surfaces.
®
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