Flowserve VCT - Manual (Page 18)

USER INSTRUCTIONS APM, APMA and APH MX0301 - 07/03
Page 18 of 32
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7 FAULTS; CAUSES AND REMEDIES
Trouble
Cause Remedy
Insufficient Capacity Speed to low Check power supply to motor for
correct voltage.
Wrong rotation Reconnect motor leads
Foreign material in impeller,
casing, diffusion vanes, and/or
discharge head nozzle Dismantle pump and remove any
foreign material
Mechanical defects:
Impeller damaged.
Share impeller key. Dismantle pump and check
Insufficient supply of water to be
pumped Determine proper level of water in
sump and proper pump
submergence.
Pump vibrates Loose mounting or coupling
bolts.
Broken or worn pieces Tighten bolts
Inspect and replace same
Coupling misalignment Check alignment and correct
Cavitation Determine proper level of water in
sump and proper pump
submergence
Foreign material in impeller
causing unbalance. Dismantle pump and remove
foreign material.
Mechanical defects:
Shaft bent.
Bearing worn.
Dismantle pump and replace part
or parts causing vibration
Pump overloads driver Speed to high Check power supply for correct
frequency
Pump bearing Seize or rotating
element binds Check rotor setting. Dismantle
pump and replace parts causing
rubbing, seizures or binding.
Pump stops abruptly Pump binding at running fits Dismantle pump and correct
Stuffing box overheats Stuffing box packed too tight Repack stuffing box with new
packing per “Stuffing Box
Packing” instructions.
Insufficient Leakage in packing Loosen gland nuts and retighten
finger tight or until proper leakage
is obtained
Excessive Gland
Leakage Packing not seated Gland not tighten evenly loosen
nuts and tighten evenly. (see
“Stuffing Box Packing”
instructions)
Worn Packing Replace packing
Pump is noisy Cavitation Determine proper level of water in
sump and proper pump
submergence
Loose parts Tighten or replace defective parts
Noise in driver Check driver IOM manual
Refer to driver manufacturer´s instruction manual for trouble shooting of driver