no fluid in closer

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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 ...
The valve on the back of a 4041/4040XP closer is a "Back Check Selector Valve" that needs to be turned in on "Parallel Arm" mount applications ONLY. If a 4041/4040XP closer mounted "Top Jamb", or "...
ST-1630 is required when mounting a 4041 or 4040XP door closer regular (pull/hinge) side with a concealed GJ100 or GJ410 series over head stop.
To correctly answer this question, we need to know how much more force is required to get the door closed. They could try turning the Rod & Shoe over (short side of shoe towards the hinge), or they...
The 62A shoe is used when it is necessary to install the door closer (lower) down on the door so that it will operate under accessories such as overhead stops, coordinators, etc.
It would be unnecessary to use the CNS/Cush arm and the Glynn Johnson overhead devices in the same application, both mechanisms stop the door.