Xylem IM100 Model SFH/SFC - Manual (Page 5)

5
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.
9. Disassembly
1. Always turn power off.
2. Drain system. Flush if necessary.
3. Remove motor hold-down bolts.
4. Remove casing bolts and pump hold-down bolts.
5. Remove motor and rotating element from casing.
6. Unscrew impeller bolt with a socket wrench. Do not
insert screwdriver between impeller vanes to prevent
rotation. It may be necessary to use a strap wrench
around the impeller if impacting the socket wrench will
not loosen the impeller bolt.
7. Insert two pry bars (180º apart) between impeller and
seal housing. Pry off impeller.
8. Remove, seal spring, cupwasher, seal rotary and
impeller key.
9. Remove seal housing.
10. Remove shaft sleeve from shaft. It will be necessary to
heat the shaft sleeve evenly with a propane torch to
break the Loctite
® bond between these parts.
11. Place seal housing on flat surface. Press out stationary
seal parts.
12. Remove wear ring if excessively worn. Use pry bar and/
or vicegrips.
10. Reassembly
1. All parts should be cleaned before assembly.
2. Refer to parts list to identify required replacement items.
3. Reassembly is the reverse of the disassembly procedure.
4. Check shaft for maximum runout of .005" TIR.
5. All mechanical seal components must be in good
condition or leakage may result. Replacement of
complete seal assembly, whenever seal has been
removed, is good standard practice.
6. If wear ring is being replaced, do not use lubricants on
the metal-to-metal fit when pressing in the replacement.
7. If shaft sleeve is being replaced, clean motor (or bearing
frame) shaft thoroughly. Place a few drops of Loctite
271 on the shaft at the shaft sleeve location. Slide the
shaft sleeve on to the shaft and rotate the sleeve 2 full
turns to evenly distribute the Loctite.
8. Install the mechanical seal stationary seat in the seal
housing, using soapy water as a lubricant to ease
insertion.
9. Install the mechanical seal spring and rotary on the
shaft sleeve using soapy water to lubricate. Place the
mechanical seal spring retainer over the impeller hub.
10. Place the impeller key into the shaft keyway and slide
the impeller in place. Install the impeller bolt and
impeller washer. Be sure that a new impeller bolt is
used. Tighten S-Group (
3 ⁄
8
" thread) to 17 lb.ft. and
M-Group ( 1 ⁄
2
" thread) to 38 lb.ft.
11. Troubleshooting
1. Motor does not start, and no noise or vibration occurs:
1.1. Power supply not connected.
1.2. Fuses or protection device tripped or defective.
1.3. Loose or broken electrical connections.
2. Motor will not start, but generates noise and vibration:
2.1. Motor not wired as directed on diagram.
2.2. Shaft locked due to mechanical obstructions in
motor or pump.
2.3. Low voltage or phase loss on three phase supply.
3. Pump does not deliver rated capacity:
3.1. Pump not filled and primed.
3.2. Pump has lost prime due to leaks in suction line.
3.3. Direction of rotation incorrect. See Rotation.
3.4. Head required is higher than that originally
specified. (Valve may be partially closed.)
3.5. Foot valve clogged.
3.6. Suction lift too high.
3.7. Suction pipe diameter too small.
4. Protection trips as unit starts:
4.1. Phase loss on three-phase supply.
4.2. Protection device may be defective.
4.3. Loose or broken electrical connections.
4.4. Check motor resistance and insulation to ground.
5. Protection device trips too often:
5.1. Protection may be set to a value lower than motor
full load.
5.2. Phase loss due to faulty contacts or supply cable.
5.3. Liquid is viscous or its specific gravity is too high.
5.4. Rubbing occurs between rotating and stationary parts.
6. Shaft spins with difficulty:
6.1. Check for obstructions in the motor or the pump.
6.2. Rubbing occurs between rotating and stationary parts.
6.3. Check bearings for proper conditions.
7. Pump vibrates, runs noisily, and flow rate is uneven:
7.1. Pump runs beyond rated capacity.
7.2. Pump or piping not properly secured.
7.3. Suction lift too high.
7.4. Suction pipe diameter too small.
7.5. Cavitation caused by insufficient liquid supply or
excessive suction losses.
7.6. Impeller blockage.
8. When stopped, unit turns slowly in the reverse direction:
8.1. Leaks on air locks in suction pipe.
8.2. Partial blockage in check valve.
9. In pressure boosting applications, the unit starts and
stops too often:
9.1. Pressure switch settings are incorrect.
9.2. Tank size may be incorrect.
10. In pressure boosting applications, the unit does not stop:
10.1. Pressure switch maximum setting is higher than
was specified.
10.2. Direction of rotation incorrect. See Rotation.