Xylem IM191 R03 Marlow Series Prime Line Self-Priming Centrifugal Pumps - Manual (Page 7)

7
Check drive coupling alignment. (Refer to Coupling
Alignment section for instructions.)
Check motor wiring.
1. All electrical work must be done
by a licensed electrician.
2. Before working on pump and/or
motor be certain the electrical power
is off at the main junction box.
3. Disconnect the fuse or circuit breaker
and have the main switch tagged
“DO NOT ENERGIZE THIS
SWITCH, PERSONNEL WORKING
ON EQUIPMENT.”
4. Some motors are equipped with built-in thermal
overloads to shut off the motors in the event the
temperature becomes excessive (as a result of
mechanical or electrical problems, such as low
voltage, poor ventilation, overloaded lines, etc.).
These motors will restart automatically as the motor
cools down. For safety sake, DO NOT work on any
motor without shutting off the electricity.
5. Never operate an electric motor driven pump
without properly grounding the motor frame. Serious
injury or death by electrocution could result.
6. Drain pump casing completely before taking pump
apart. It is advisable to flush the inside of the casing
with water before taking pump apart.
7. Never start pump before putting
back all necessary guards such as
coupling guard.
• After stabilizing the system at normal operating conditions,
check the piping. If necessary, adjust the pipe supports.
• On frame-mounted units, coupling alignment may have
changed due to the temperature differential between pump
and motor. Recheck alignment following procedures and
hazard warnings in “COUPLING ALIGNMENT” section of
this manual.
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 (47).
2. Remove back pull-out assembly from casing (1).
Discard gasket (8).
3. Remove diffuser and o-ring.
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/nut (4). Impeller bolt/nut may
need to be heated with torch to remove. Discard.
NOTICE: EXERCISE CAUTION WHEN HANDLING
HOT IMPELLER BOLT/NUT.
6. Remove impeller washer (5).
7. Insert two pry bars, 180° apart, between impeller and
seal housing (10). CAREFULLY pry off impeller.
8. Remove impeller key (37).
9. Remove seal housing bolts (33) and seal housing (10)
pulling with it the mechanical seal assembly. Discard seal
assembly.
10. Inspect shaft sleeve (24). If badly scored, remove by
heating with torch. Discard.
11. Push out the mechanical seal stationary seat from the
seal housing. Discard.
NOTE: Check impeller and diffuser for any broken vanes or
wear. Replace it if necessary. Also check diffuser o-ring (7).
Replace if damaged.
DISASSEMBLY OF BEARING FRAME (P-SERIES)
1. Remove deflector (63) from shaft.
2. Remove bearing cover (80).
3. Remove shaft assembly from frame.
4. Remove lip seals (69, 81) from bearing frame (70) and
bearing cover (80) if worn. Discard.
5. Remove retaining ring (71).
6. Use bearing puller or arbor press to remove ball
bearings (74, 78).
DISASSEMBLY OF BEARING FRAME (4E AND 6E)
1. Drain bearing housing oil cavity by removing drain plug
(28) for oil lubrication bearing housing.
2. Remove capscrews (33) to disassemble bearing housing
(31) from bracket (67).
NOTE: Check gasket (8) if worn, replace it.
3. Remove the shaft assembly with bearings and bearing
carrier (110) out of the bearing housing (31).
4. Check both lip seals (42), replace if necessary.
5. Remove the snap ring (108) from the shaft (38).
6. Check the bearings. If they feel rough when turning by
hand, replace the bearings.
Reassembly
• All parts should be cleaned before assembly.
NOTICE: O-RING SHOULD BE REPLACED AFTER ANY
DISASSEMBLY OF UNIT.
WARNING
Hazardous voltage
can shock, burn or
cause death.
Hazardous Machinery
WARNING