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    Liftmaster Lt Duty Commercial opener problem - Conflicting "Expert" advice

    Ed Salter

    Posts : 4
    Join date : 2018-01-21

    Liftmaster Lt Duty Commercial opener problem - Conflicting "Expert" advice

    Post  Ed Salter on Sat Jan 27, 2018 1:45 pm

    Hi Folks,

    I have a Liftmaster LG05011L, hi lift light duty commercial door opener made/installed in 2000 on a seldom used high lift garage door.  Three years ago while lowering it caught a board in the track and sprung the cable.  I called the original company who installed it and their repairman re-wound the cable and repaired it for $125 house call.  Last year the same thing happened again, it forcefully came down deflecting/spitting out the board from the track almost hitting me.  I re-wound the cable myself, and it operated seemingly fine but I could not properly set its limits, so I operated it manually for the last 12 months.

    I called the same company as before to come.  Repairman arrived and I explained what happened to door recently and in the past.  I questioned the door sensitivity setting by the last repairman there since it seemed to really forcefully strike the board with such force that it shot it out the side.  He explained that the last technician that came was since fired.  He adjusted the limits (he seemed to struggle with this??) which worked fine for one cycle.  But once the door was tested/reopened from the closed position, the motor sounded fine but for the first 12" or so traveling up the door seemed to be slipping, going up more slowly than normal while rising, and then it regained its normal speed at about 12" high and continued all the way up and stopped.  But when reactivated and coming back down at normal speed it appeared to have lost its down limit and stopped a foot off the ground.  This point was at about the same point its upward motion "slipping" stopped and began its normal speed.

    Repairman reset limits several times but same problem continued to happen.  Repairman was baffled, couldn't find any bent/broken sprockets, chain was fine, tension good, and then called his boss, company owner.  Boss said improper sensitivity setting had nothing to door with the door forcefully spitting out the board obstruction, and nothing to do with current malfunctioning problem at hand.  Boss said unit was toast, suggested a new model, Liftmaster #8500W Side Mount Opener for a total cost installed of $917.40.

    I emailed Liftmaster tech support and they responded by suggesting a replacement unit of # MJ5011U.  I asked them if a motor replacement would be sufficient.   The responded yes, motor # 041D4509, about $150.  I'm somewhat mechanical and feel I could do the motor install myself.

    But before I go through the purchase and installation, I wanted to seek some guidance.  From "qualified experts" I've been given two different replacement unit numbers and then a motor replacement suggestion. ????  It would seem to me to be more of a setting or clutch type problem than a whole motor or unit replacement, but I just don't know.

    Any suggestions would be greatly appreciated.

    Thank you
    Ed bounce
    find me
    find me

    Posts : 4
    Join date : 2018-02-01

    Re: Liftmaster Lt Duty Commercial opener problem - Conflicting "Expert" advice

    Post  find me on Thu Feb 01, 2018 9:56 pm

    Unless you want to gut your current unit every couple years, I would highly suggest going with a new 8500W sidemount/jackshaft unit from liftmaster. High quality unit and very attractive. They are exactly what you want for a high lift door. However $900 seems steep unless your garage door companies are slim picking out there. We do it for roughly $700. I would call around. If you are mechanically inclined, they are not too hard of an install either. (mount motor & torsion tube together via coupler, install sensor lights/auto lock/cable tensioner, refer to manual for setting limits)

    The lost tension in springs over time is the main cause for damage to openers. Servicing your door twice a year prevents this if you are sure your technician knows what they are doing. Opener can last you a lifetime in this situation.

    Good luck, if you have any other questions let me know.
    Alpha Door Service

    Posts : 4
    Join date : 2018-02-05

    Re: Liftmaster Lt Duty Commercial opener problem - Conflicting "Expert" advice

    Post  Alpha Door Service on Wed Feb 07, 2018 11:05 am

    I wouldn't replace the motor for $150, doubtful that is the problem. The motor has no connection to the limits, you are more than likely having some sort of mechanical problem with the limits getting out of sync within one cycle. It is also very easy to throw the cables on a high lift door when it is ran down onto a object, the door stops but the opener still turns the shaft putting slack in the cables instantly, safety edges are usually used in this situation so the door stops and reverses instantly upon contact.
     I would definitely recommend the mj5011 over the 8500. For $900 to have a light duty commercial opener installed sounds good to me.
    Ed Salter

    Posts : 4
    Join date : 2018-01-21

    Liftmaster Problem

    Post  Ed Salter on Thu Feb 08, 2018 10:24 pm

    Thank you both folks for your suggestions.  Much appreciated.


    Posts : 1
    Join date : 2017-10-16

    Re: Liftmaster Lt Duty Commercial opener problem - Conflicting "Expert" advice

    Post  gmgeorge8051028 on Sun Feb 25, 2018 1:19 pm

    Ed are you sure your motor drive coupling isn't cracked allowing the door to skip teeth on the motor to screw drive. If it is all you need is a new coupling. Then you have to manually retime the unit because it will bind up.

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    Re: Liftmaster Lt Duty Commercial opener problem - Conflicting "Expert" advice

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