LMAIM1501
LY Installation and Maintenance for LY 1001, LY 2001 and LY 3001
7-11
Symptom
Possible Cause
Corrective Action
Reversing Starter failure
Excessive cycling (too
Review application to determine
frequent operation)
number of starts per hour and
review with factory if more than
100 per hour.
Excessive current draw
Valve running loads higher
Inspect valve for possible causes
that expected
of high running load. In particular,
check for excessive tightness of
valve packing and for proper
lubrication of valve. Consult
Flowserve for review of application.
Motor overload tripping
Excessive current draw
Inspect valve for possible causes
of high running load. In particular,
check for excessive tightness of
valve packing and for proper
lubrication of valve. Consult
Flowserve for review of application.
Incorrect overloads
Verify proper overloads selected
for motor rating.
Excessive gear wear
Excessive loads
Verify actual loads are in
accordance with both start and
run capabilities of your actuator.
Inadequate lubrication
Inspect quality and quantity of
lubrication in accordance with
Section 7.1, Lubrication.
Improper alignment
Inspect worn gears for evidence
of uneven wear pattern.
Excessive torque
Valve running loads higher
Inspect valve for possible cause of
required to turn
than expected
high running loads. In particular,
handwheel
check for excessive tightness of
valve packing, proper lubrication
of valve stem, bent or damaged
valve, tight Stem/Torque Nut
fit, worm, or damaged Stem Nut.
Unit is not properly aligned
Take bolts off between the unit
with valve
and the valve and check for
proper unit alignment.
Oil leaking from unit
Infrequent operation of
Institute periodic operation of
actuator resulting in grease
unit into a maintenance program
separation
to keep grease mixed. If not
possible, schedule more frequent
lubrication to ensure adequate
lubrication of gearbox.
Damaged or worn seals
Replace seals.
Valve is closed, but
Valve mechanical stops
a. Do not set Torque Switch
flow is not cut off
not set correctlyhigher than maximum setting
defined by Torque Limiter
CAUTION: Most quarter-turn valves are position-seated, not
Plate. Inspect valve seat and
torque-seated. Applying additional torque to the hand-
repair as required.
wheel and/or repeated electrical bumping at the full
b. Check setting of Closed
closed position may damage the valve and/or the actuator.
Mechanical Stop.
Flow Control Division
Limitorque Actuation Systems
