Home Forums General Discussion Technical Questions Dover DMC door problem

I have a Dover DMC HD 85 2 speed side slide doors the problem I'm having is when the door is fully open and hit my door open limit the doors slowly drift closed off the limit and then reopen I'm hooked up with a laptop going into door settings not sure if there's a setting in here to stop these doors from closing or is this possibly a mechanical adjustment. Tia

It's mechanical

I kind of thought that it was I have to get manual on this unit and read up on adjustments.i also seem to remember they use to have a spring on the trailing side of the hoist way door was that to assist in keeping it open not sure

They have no power on them in the open so the spirator and the weight of the door linkage will pull the door closed. The operator has to be adjusted so that the linkage comes much closer to a mechanical lockout (the point just before the door starts go the other direction.)

Be sure to check the fastener at the drive arm (arm connected to the secondary big sheave) to the door connector arm. That 3/8” fluted bolt or whatever it is is notorious for loosening up causing DCL/DOL troubles. Another thing is the door belt itself. Check tension and check to see there’s no stretch fatigue at the belt/operator motor sheave point when fully open.

Checked all bolts on linkage belts all replaced and correct tension no slippage did find DOL ban with magnets split replaced that .now when I get back think issue is what indirtwetrust said mechanical issue at this point looking for manual on HD 85 operator if anyone has pdf that be great thanks