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spencecarmenSep 14, 2025
What to do if Nabco Gate Opener door slams open?
- LlwrightSep 14, 2025
If your Nabco Gate Opener door slams open, it might be due to the Back Check being set too high. For GT-300/400/500 models, decrease the speed by turning the BCHK Potentiometer on the Magnum 4A Control board counterclockwise. For GT-710 models, adjust the Back Check speed on the hydraulic closer clockwise to decrease the speed. Another cause could be a misplaced back check magnet on GT-710 models; reposition the magnet to its proper location. Also, the operator may not be correctly preloaded; pre-load the operator by correctly installing the arm on the operator spindle.