Door Closer, DIN3 force (optimal door weight is 60 kg, width: 850-1400 mm and height: 2100 mm), commercial production.
Installation, adjustment, maintenance, repairs must be done by a qualified specialist.
It is necessary to check details on tightness and wear; to tighten fixing screws and replace defective parts.
It is necessary to lubricate the moving parts at least once a year, check adjustment and smooth door travel.
It may be needed to adjust the closing speed when operating at low or high temperatures.