1900 Series Horizontal Splitcase Pumps
Instruction and Repair Manual
21
11/12/18
TROUBLE
PROBABLE CAUSE
REMEDY
2. Motor fails to come up to speed.
a. Low or incorrect voltage.
a. Check voltage at Tl-T2-T3 in
control panel.
b. Incorrect connections at motor.
b. Check for proper lead
connections at motor, compare
with connection diagram on
motor.
c. Overload–mechanical.
c. Check impeller setting. Check
for tight or locked shaft.
d. Overload–hydraulic.
d. Check impeller setting. Check GPM
against pump capacity and head.
4. Motor vibrates.
a. Inadequate ventilation.
a. Assure adequate supply of fresh
air. Check air blast through motor
by feeling air discharge at bottom
of motor.
b. Overload.
b. Check load with ammeter.
c. Unbalanced supply voltage.
c. Check supply voltage with volt
meter.
a. Headshaft misaligned.
a. Remove top drive coupling and
check alignment of motor to pump.
b. Worn shaft bearings or bent shaft.
b. Disconnect motor from pump
and run motor only to determine
source of vibration.
c. Hydraulic disturbance in discharge
piping.
c. Check isolation joint in discharge
piping near pump head.
d. Unbalanced rotor assembly.
d. Balance rotor.
e. Motor not mounted securely.
e. Secure properly and check
alignment.
5. Motor noisy.
a. Worn thrust bearing.
a. Remove dust cover, rotate rotor by
hand and make visual inspection
of balls and races. (Bearing noise
is usually accompanied by high
frequency vibration.)
b. Electrical noise.
b. Most electrical motors are noisy
during the starting period. The
noise should diminish as the motor
reaches full speed.
6. Incorrect rotation.
a. Incorrect connections.
a. Refer to connection diagram
and reconnect according to
instructions.
