1 mounting screws loose or missing, resulting in a closed-door device is not installed in the correct position, the connection arm damage

     
    2 hours behind closed doors to close the cushion effect of variation, resulting in impact between door and door frame, door deformation;
From a structural point of view, is a closed door closer overall, from the basic shape can not see its quality.
Door closers most critical issue is whether the quality of oil spills, because the door closer is to rely on its internal hydraulic system fluid throttling to achieve closed process control, oil spill means the failure of hydraulic system, hydraulic system is therefore determine the service life of the only standard door closer.
Leakage of the most important reason is wear of the pinion bearing guide to gap increases, seal ring wear down or cause a buffer effect in the regulation of the core when the throttle valve counter-clockwise rotation to leave.
Buffering effect of door closer is lower because the oil spill caused the air to enter or rack piston cylinder and the body-oriented coordination (cutting) with increasing the gap. Therefore, a small gear, pieces of supporting material-oriented, heat treatment and machining quality and precision is very important.
Buffering effect for the poor door closer, just to save money by adjusting the throttle valve core can not solve the problem. Maintenance approach must be adopted, if the Department is supporting guidance documents leakage, remove the Bearing-oriented pieces, check seal condition, such as worn or aging failure, replace the seals. If the supporting guidance document and the gap between the pinion shaft is too large, replacement parts supporting guidance. If the rack piston driven cylinder wear, and the valve body with the gap between the effect of increasing lead to cutting down, can remove the plunger rack with chrome plated ways to repair. In addition, the buffer effect of door closer to ensure the case, switch to softer springs, but also to reduce the effect of variation due to the back door of the frame buffer the impact force of a method.

Installation of camera

 Second, the installation of the way behind closed doors

 Most often used is externally mounted door closer door closer, and their installation are as follows:
The most common standard usage is installed behind closed doors to hinge side of the door opening side. When this installation, the door closer arm outwards prominent, and the door frame into about 90 ¡ã.
The second usage, behind closed doors with the hinges installed in the opposite side of the door closing side. Usually provided with a door closer with an extra bracket to the arm parallel to the door frame. This usage is usually reluctant to camera installed outside the building's outer door opening outwards.
Door closer body, in turn installed above the door frame instead, door closers door hinges in the opposite side. This usage can also be used in the outer door open outwards, particularly on only a very narrow along, but not wide enough space to accommodate the door closer body of those doors.

        3, door closer installation steps