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frank roarty
 
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http://home.comcast.net/~froarty572/openfaq.htm
Sticking is commonly cause by improper mounting of door track to
surface not flush with jamb. test for this in down position and see if
any points along mating surface refuse to move in and out under
moderate hand presure. door trim is installed to bind slightly near
bottom to prevent damage if door is closed rapidly so ignore this if
visibly caused by trim. If builder uses 2x4 jamb the mounting leg for
vertical track may end up laged into a "sister" stud that is not flush
with jamb. this will cause distance between mating door surface and
jamb to vary along the travel. proper solution is to use 2x6 jambs but
this will not be feasible after construction therefore use 8 penny
nail or lg drywall screw between mounting foot and jamb to equalize
distance. be sure to retighten mounting bolt after insertion of
"spacer".

When you test for sticking - pull down on emergency release and then
grab the attached arm and exert force from this end of door. the test
you performed using the door handle is not the same resistance felt by
opener. the difference is dramatic, very often the act of pulling down
on the bottom section will mask a door stick caused by door bottom
driving itself into door jamb if clearance is too shallow. other
sticking issues are caused by track mounting not flush with jamb but
you should have been able to see this visibly and correct with spacers
under track feet. good troubleshooting method however is to loosen
bottom 2 track feet on vertical rail and experiment with slop
provided. With door almost closed and hand on handle you should be
able to shift door side to side slightly if slop is set correctly-
carefull though -too much and rollers can escape. final possible cause
is vertical track is "stuck" on rough cement floor and is ignoring
your adjustments on feet. this is actually quite common and just
repaired one of these today. take a hammer and a blunt item that fits
inside track then hammer object to free the stick -even an 1/8 inch
will make a big difference if this is your culprit. one last item
about sticking and then off my soapbox. never paint a door unless you
have time and temperature to let it dry before closing- the paint will
transfer to vinyl sweep on door trim and effectively become a break!