Troubleshooting Chart - ITT G&L Pumps NPE Manual De Instrucciones

7.2. Make complete check after unit is run under operating
conditions and temperature has stabilized. Check for expansion
of piping. On frame-mounted units coupling alignment may have
changed due to the temperature differential between pump and
motor. Recheck alignment.
8. Maintenance:
8.1. Close-Coupled Unit. Ball bearings are located in and are part of
the motor. They are permanently lubricated. No greasing required.
8.2. Frame-Mounted Units:
8.2.1. Bearing frame should be regreased every 2,000 hours or
3 month interval, whichever occurs first. Use a #2 sodium or
lithium based grease. Fill until grease comes out of relief
fittings, or lip seals, then wipe off excess.
8.2.2. Follow motor and coupling manufacturers' lubrication
instructions.
8.2.3. Alignment must be rechecked after any maintenance
work involving any disturbance of the unit.
9. Disassembly:
Complete disassembly of the unit will be described. Proceed only as
far as required to perform the maintenance work needed.
9.1. Turn off power.
9.2. Drain system. Flush if necessary.
9.3. Close-Coupled Units: Remove motor hold-down bolts.
Frame-Mounted Units: Remove coupling, spacer, coupling guard
and frame hold-down bolts.
9.4. Disassembly of Liquid End:
9.4.1. Remove casing bolts (370).
9.4.2. Remove back pull-out assembly from casing (100).
9.4.3. Remove impeller locknut (304).
CAUTION
Do not insert screwdriver between impeller vanes to prevent
rotation of close-coupled units. Remove cap at opposite end
of motor. A screwdriver slot or a pair of flats will be exposed. Using
them will prevent impeller damage.
9.4.4. Remove impeller (101) by turning counter-clockwise
when looking at the front of the pump. Protect hand with rag
or glove.
CAUTION
Failure to remove the impeller in a counter-clockwise direction may
damage threading on the impeller, shaft or both.
9.4.5. With two pry bars 180 degrees apart and inserted
between the seal housing (184) and the motor adapter (108),
carefully separate the two parts. The mechanical seal rotary
unit (383) should come off the shaft with the seal housing.
9.4.6. Push out the mechanical seal stationary seat from the
motor side of the seal housing.
9.5. Disassembly of Bearing Frame:
9.5.1. Remove bearing cover (109).
9.5.2. Remove shaft assembly from frame (228).
9.5.3. Remove lip seals (138 & 139) from bearing frame and
bearing cover if worn and are being replaced.
9.5.5. Use bearing puller or arbor press to remove ball bearings
(112 & 168).
10. Reassembly:
10.1. All parts should be cleaned before assembly.
10.2. Refer to parts list to identify required replacement items.
Specify pump index or catalog number when ordering parts.
10.3. Reassembly is the reverse of disassembly.
10.3.1. Impeller and impeller locknut assembled onto motor
shaft with 10 ft-lbs of torque.
10.4. Observe the following when reassembling thebearing frame:
10.4.1. Replace lip seals if worn or damaged.
10.4.2. Replace ball bearings if loose, rough or noisy
when rotated.
10.4.3. Check shaft for runout. Maximum permissible is
.002" T.I.R.
10.5. Observe the following when reassembling the liquid-end:
10.5.1. 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.
It is permissible to use a light lubricant, such as glycerin, to
facilitate assembly. Do not contaminate the mechanical seal
faces with lubricant.
10.5.2. Inspect casing O-ring (513) and replace if damaged.
This O-ring may be lubricated with petroleum jelly to ease
assembly.
10.5.3. Inspect guidevane O-ring (349) and replace if worn.
CAUTION
Do not lubricate guidevane O-ring (349). Insure it is not
pinched by the impeller on reassembly.
10.6. Check reassembled unit for binding. Correct as required.
10.7. Tighten casing bolts in a star pattern to prevent O-ring binding.
11. Trouble Shooting Chart:
MOTOR NOT RUNNING
(See causes 1 thru 6)
LITTLE OR NO LIQUID DELIVERED:
(See causes 7 thru 17)
POWER CONSUMPTION TOO HIGH:
(See causes 4, 17, 18, 19, 22)
EXCESSIVE NOISE AND VIBRATION:
(See causes 4, 6, 9, 13, 15, 16, 18, 20, 21, 22)
PROBABLE CAUSE:
1. Tripped thermal protector
2. Open circuit breaker
3. Blown fuse
4. Rotating parts binding
5. Motor wired improperly
6. Defective motor
7. Not primed
8. Discharge plugged or valve closed
9. Incorrect rotation
10. Foot valve too small, suction not submerged, inlet
screen plugged.
11. Low voltage
12. Phase loss (3-phase only)
13. Air or gasses in liquid
14. System head too high
15. NPSHA too low:
Suction lift too high or suction losses excessive.
Check with vacuum gauge.
16. Impeller worn or plugged
17. Incorrect impeller diameter
18. Head too low causing excessive flow rate
19. Viscosity or specific gravity too high
20. Worn bearings
21. Pump or piping loose
22. Pump and motor misaligned
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