7-10 LY Installation and Maintenance for LY 1001, LY 2001 and LY 3001 LMAIM1501
Symptom Possible Cause Corrective Action
Motor runs, but no Damaged gearing Disassemble actuator in
output from unit accordance with Section 7.3.1,
Disassemble Unit LY 1001 or
Section 7.3.3, Disassemble Unit
LY 2001/3001 as applicable. Inspect
gearing for rough or damaged
spots. Replace as required. Most
often, damaged spots are seen in
motor gear set.
Unit operation is noisy Inadequate lubrication (poor Inspect quality and quantity of
quality or not enough) lubrication in accordance with
Section 7.1, Lubrication.
Gearing misaligned Inspect gearing for uneven wear
pattern and replace gearing as
needed. Most wear is seen in the
motor gear set.
Worn or damaged bearings Disassemble unit and replace
worn bearings, seals, and
lubricant.
Fuse blown Incorrect fuse size Verify fuses are sized correctly.
Pinched wire Inspect control compartment to
ensure Control Cover is not
pinching or making contact with
wiring when installed.
Power surges Investigate control circuit for surges.
Premature Torque Torque Switch setting too low Increase Torque Switch setting as
Switch trip required, up to but not exceeding
maximum setting established by
the Torque Switch Limiter Plate.
Valve packing too tight Inspect valve packing for
excessive tightness. Repair valve
by replacing packing as required.
Refer to your valve manufacturer
for specific instructions.
Unit is not properly aligned Take bolts off between
with valve the unit and the valve. Check for
proper unit alignment.
Valve needs lubrication Check valve lubrication using
grease fitting on bottom of valve.
Torque Switch fails to Output rotation not in Consult Flowserve to verify
stop actuator agreement with unit wiring design rotation. If actual rotation
is opposite to design rotation, the
Torque Switch needs to have
contact wiring reversed.
Inadequate voltage going to unit Check incoming voltage supply.
Reversing Starter failure Starter undersized Verify starter is sized correctly for
application. Consult factory to
(continued)
evaluate.
Flow Control Division
Limitorque Actuation Systems
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