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Maintenance
S149-01-880 Issue F
Motor stops or will not start. Thermal overload units in motor
starter fail.
Check Capacity of thermal overload
units by comparing ampere rating on
motor nameplate with overload
table inside starter box. If necessary,
use one (1) size larger than
standard.
Possible internal seizure. Disassemble and correct.
Pump does not turn when motor
starts.
V-belts too loose. Tighten V-belts (see Section 5.8).
Cylinder flooded with excessive oil
due to defective solenoid valve
(Valve stuck in open position from
previous shutdown, or foreign
material in valve seat).
Turn pump over by hand to remove
excess oil. Disassemble valve, clean
and replace any worn parts. Check
solenoid.
Oil viscosity too high or oil
temperature too low.
Change to lighter grade oil or warm
oil before filling pump (especially
with low ambient temperatures).
Pump should not be started when oil
temperature is less then 13 °C
(55 °F) (When using V-lube F).
Turn pump over by hand before
starting.
Pulley(s) not keyed to shaft. Ensure keys are in place and
pulley(s) properly tightened.
Pump turns in reverse direction
when motor is turned off.
Gas ballast valve in open position on
pump shut down.
Close gas ballast valve prior to pump
shut down. Atmospheric air prevents
reversing direction of pump piston
on pump shutdown. Oil will also be
prevented from back-streaming into
inlet piping.
Table 8 - Fault finding guide (continued)
Symptom Probable Cause Recommended Solution
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