Xylem IMDWT R02 Model DWT Deep Well Turbine Pumps - Manual (Page 23)

23
TroUBLESHooTING
TroUBLE ProBABLE CAUSE rEMEdY
6. Pump takes too much A. Damaged impeller Inspect, replace if damaged.
power B. Foreign object lodged between Remove object as required.
impeller and bowl
C. Specific gravity higher than Test liquid for viscosity and
pump designed for specific gravity.
D. Viscosity too high, partial Check for both. They can cause
freezing of pumpage drag on impeller.
E. Defective bearing Replace bearing, check shaft or
shaft sleeve for scoring.
F. Packing is too tight Release gland pressure.
Retighten. (See page 18.) Keep
leakage flowing. If no leakage,
check packing, sleeve or shaft.
7. Pump is too noisy A. Cavitation Same as Item 3-B.
B. Bent shaft Straighten as required. See
Page 11 for runout limits.
C. Rotating parts binding, loose Replace as required.
or broken.
D. Bearings are worn out Replace bearings.
E. Resonance Check piping strain, consult factory.
8. Excessive vibrations A. Coupling misalignment, bent Determine cause utilizing shaft
impeller unbalance, worn vibration frequency analyzer
bearings, cavitation, piping and/or pump disassemble.
strain and/or resonance Complex problem may require
factory service assistance.
B. Motor or gear driveshaft end See Installation of Hollow Shaft
play maladjustment Driver (VHS), Page 15.
C. Bent shaft Straighten as required. See
Page 11 for runout limits.
D. Crooked well. Survey the well and consult factory.
9. Pump leaks excessively A. Defective packing Replace worn packing.
at stuffing box B. Wrong type of packing Replace packing not properly
installed or run-in. Replace
improper packing with correct
grade for liquid being pumped.
10. Stuffing box is A. Packing is too tight See item 6-F.
overheating B. Packing is not lubricated Release gland pressure and
replace all packing if burnt or
damaged. Re-grease packing
as required.
C. Wrong grade of packing Consult factory.
D. Stuffing box improperly packed Repack stuffing box.
11. Packing wears too fast A. Shaft or shaft sleeve worn Pull pump and remachine, or
replace shaft and/or sleeve.
B. Insufficient or no lubrication Repack and make sure packing
is loose enough to allow some
leakage.
C. Improperly packed Repack properly, make sure all
old packing is removed and
stuffing box is clean.
D. Wrong grade of packing Consult factory.