Chamberlain MR850 Garage Door Opener User Manual


 
T
ESTING THE DOOR
4
Complete the following test to ensure your door is well
balanced, and not sticking or binding:
Disable all locks and remove any ropes connected to the
garage door.
Lift the door to about halfway and then release it. The
door should remain spring balanced.
Raise and lower the door to determine if there are any
sticking or binding points.
If your door does not hold in place or the door binds or
sticks, call a qualified door technician before installing the
opener.
Non opener side
Opener side
Install the stop collar on the opposite end to where
the opener is to be installed.
Fit the stop collar hard against the boss of the door
drum. Ensure the U-bolt holding the door shaft to the door
bracket is tightly secured.
INSTALLING THE STOP COLLAR
5
Place the weight in the centre of the door (as shown).
Use a pencil to mark the two hole positions.
If the door curtain does not have a handle you will need
to drill two 5.5mm holes through the two marked
positions, then place the weight bar on the inside of the
door.
Use the bolts, washers and nuts (provided) to
fasten the weight bar in place.
NOTE: If the door has a lifting handle, remove the
handle, nuts & bolts. Place weight bar over the
handle holes, insert extended bolts through the
weight bar & fasten handle back in place.
INSTALLING THE WEIGHT BAR (PROVIDED)
6
3
SAFETY CHECK!
Is the stop collar
installed?
YES: proceed to the next
step
NO: install the stop collar
before proceeding