what fluid is used

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The fluid in an LCN closer must not be refilled in the field. See attached Warranty and Repair Communication 
The LCN closer fluid "Liquid X" will perform without variation between:  -30° F to +120° F - for manual closers.  +35° F to +120° F - for electrical closers and automatic operators. At around ...
Excessive premature frame rusting is caused by improper jobsite installation practices and most likely caused by the following circumstances: Grout: Frames are grouted in place using incorrec...
The regulation valves are designed to adjust the flow the hydraulic fluid in the closer which regulates the door closing speed through various phases of the closing cycle. The regulation valves h...