what fluid does LCN closer use

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The fluid in an LCN closer must not be refilled in the field. See attached Warranty and Repair Communication 
Special Rust Inhibitor (SRI) - is a pretreatment that is applied to the metal components prior to the addition of the LCN powder coat finish, standard or custom. ...
The old 4030/4130 closers and arms are obsolete, there is nothing to replace them. No arm from other closers will fit  There is no closer that can replace the old 4030 series closer with the exa...
LCN does not recommend this type of installation, and has never sold a coupler to do this.
The maximum recommended door weight for LCN closers is 225 lbs.
LCN does not supply Allen wrenches, the size that LCN uses, are standard sizes that every installer will have in their tool kit. 3/32" Allen wrench for adjusting regulation valves: main speed, lat...
There are a few things that can cause a closer to slam. The closer could be adjusted incorrectly. Turn all regulating screws clockwise until they stop. Then open each valve 1 and 1/2 turns. If t...