The older model 3800/3900 jackshaft opener is 16.25″ inches in height, 6.01″ inches wide and has 6.85″ inches of depth. Per manufacturer specifications the 8500W is 21.25″ in height, 7.5″ wide and has 7.9″ of depth. So now that we have established that you must have a torsion hardware based garage door lets look at the dimensions of the machine itself. Again, this operator requires a standard torsion spring counterbalancing system.
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You also cannot install this operator on Wayne Dalton Torquemaster doors.
I wouldn’t advise this type of installation because of manufacturer specifications. There are some Youtube heroes out there that will tell you to mount the 8500 upside down and don’t use the cable tension monitor.
I have seen people make some crazy modifications involving sprockets with extension spring doors, but its best not to attempt these workarounds. Not only do they lack a main drive shaft, but they also are an unbalanced system. On a low clearance setup the torsion springs flip sides and are wound opposite.Įxtension springs that stretch along the horizontal tracks are not compatible with Liftmaster’s 8500 operator either. This also has to do with the way the springs are wound. Since the 8500 is a shaft driven opener vs rail driven you must have a standard (not low clearance/headroom) torsion spring setup installed. Installing the operator on an overhead door that is over of these requirements will void your warranty and possibly damage your machine. Whether you will need an opener for new construction or retrofit, here are some of the basic requirements to install the operator.īased on the size of the DC motor and drive mechanism in the 8500 it can support a garage door of up to 14ft tall, 18ft wide, 650 LBs or 180 square feet. The 8500 comes with some manufacturer headroom requirements that can’t be ignored.
Jackshaft Installation Requirements 8500W Jackshaft Opener Purchase Linkįirst, lets get into who can actually utilize the low profile design of the opener. Side Mount Opener Building Applicationsġ.
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