Limitorque Multi-Turn Actuator L120-10

Ensure that the unit is in manual mode and load is removed from the wormshaft spring pack

Note the open and close torque switch settings prior to reinstalling the torque switch

Loosen screws (A) and position both pointers (B) at the #1 setting, then tighten screw (A)

Loosen balancing screws and install the torque switch

Ensure the base of the torque switch is flush against the compartment and the hole for the mounting screw is aligned

Ensure the actuator has been stored properly if not in use

Has the actuator been stored for a long period?

Inspect the gear case for proper lubrication

Is there any weeping around shaft seals?

Remove any weeping with a clean rag if found

Is the gear case mounted in a position that could cause vulnerable areas to be saturated with lubricant?

Place the L120 unit in manual mode

Release the load on the worm shaft spring pack

Ensure the operator is not in a loaded condition before proceeding

Torque Switch Setting Adjustment

Adjust the torque switch setting for both open and close directions

Set the pointer to the desired position

Put the actuator into manual operation and use the handwheel to operate the valve in the 'open' direction

Note the direction of the intermediate shaft (B) corresponding to the rotor or rotors to be set

When the valve is fully open, close it one turn of the handwheel to allow for coast of moving parts

Check the contacts of gear limit switch

Refer to contact development wiring diagram and see the contact required at trip position/end position (NO/NC)

Is the valve out of service and no possibility of pressure entering the line?

Disconnect all incoming power to the unit

Remove stem nut bearings and seals