Normally, the Southern Steel 1120 Pneumatic lock should not require adjustments after being properly installed. Maintenance tips for all Southern Steel locks is provided in the General Maintenance Guidelines. Review these guidelines before attempting to trouble shoot the 1120.

When inspecting the 1120 Pneumatic lock, check all electrical and air connections at the lock. Faulty light indication may be caused by loose or improperly connected wires or air hose connection. Also check for proper voltage and air pressure at the lock. Refer to the 1120 Pneumatic wiring diagram for electrical requirements.