Limitorque
®
L120-190 through L120-2000 FCD LMENIM1203-01-A4 – 05/15
12
c WARNING: Actuators equipped with electrical devices (motors, controls) requiring field wiring
must be wired and checked for proper operation by a qualified tradesman.
c WARNING: Use of the product must be suspended any time it fails to operate properly.
a CAUTION: Do not use oversized motor overload heaters. Instead, look for the cause of the
overload.
a CAUTION: Do not operate the valve under motor operation without first setting or checking the
limit switch setting and motor direction.
a CAUTION: Do not force the declutch lever into the motor operation position. The lever returns to
this position automatically when the motor is energized.
a CAUTION: Do not depress the declutch lever during motor operation to stop valve travel.
a CAUTION: Do not use replacement parts that are not genuine Flowserve Limitorque parts, as
serious personal injury and/or damage to the actuator and valve may result.
a CAUTION: Do not lift actuator/gearbox or actuator/valve combinations with only the eye bolts in
the L120 actuator. These eye bolts are designed for lifting the L120 actuator only.
a CAUTION: Do not lift the actuator by handwheel.
4.2 Safety Practices
The following check points should be performed to maintain safe operation of the L120 actuator:
• Eye bolts are designed for lifting only the actuator and not associated gearboxes or valves.
• Mount motor on a horizontal plane, if possible. Preferably, keep the motor or limit switch compart-
ment from hanging down. This prevents head of grease from being against motor or switch seals.
• Keep the switch compartment clean and dry.
• Keep the valve stem clean and lubricated.
• Set up periodic operating schedules for infrequently used valves.
• Verify that all actuator wiring is in accordance with the applicable wiring diagram.
• Carefully check for correct motor rotation direction. If the motor is driving the valve in the wrong
direction, interchange any two leads on the three-phase motor or switch the armature leads on DC
motors.
• Use a protective stem cover. Check valve stem travel and clearance before mounting covers on rising
stem valves.
• Verify that a locking nut tightly secures the stem nut and that the top thread of the lock nut is crimped
and staked in two places.
• For the DC motor, keep the armature clean and periodically check brushes for proper contact and wear.
4.3 Actuator Preparation
NOTE: Replace all molded plastic conduit and top protectors (installed for shipping purposes only)
with pipe plugs when installation wiring is complete.
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