Connect Door Arm To Trolley - Chamberlain Merlin Whisper Drive MT3850 Installation And Operating Instructions Manual

INSTALLATION STEP 7

Connect Door Arm to Trolley

Follow instructions which apply to your door type as
illustrated below and on the following page.
SECTIONAL DOORS ONLY
Make sure garage door is fully closed. Pull the
emergency release handle to disconnect the outer trolley
from the inner trolley. Slide the outer trolley back (away
from the door) about 200mm (Figures 1, 2 and 3).
Figure 1:
• Fasten straight door arm section to outer trolley with
the clevis pin. Secure the connection with a ring
fastener.
• Fasten curved section to the door bracket in the
same way, using the clevis pin.
Figure 2:
• Bring arm sections together. Find two pairs of holes
that line up and join sections. Select holes as far
apart as possible to increase door arm rigidity.
Figure 3:
• If holes in curved arm are above holes in straight
arm, disconnect straight arm. Cut about 150mm from
the solid end. Re-connect to trolley with cut end
down as shown.
• Bring arm sections together.
• Find two pairs of holes that line up and join with
bolts, spring washers and nuts.
Pull the emergency release handle toward the opener at
a 45° angle so that the trolley release arm is horizontal.
ONE PIECE TILT DOORS
Make sure garage door is fully closed. Pull the
emergency release handle to disconnect the outer trolley
from the inner trolley. Slide the outer trolley back (away
from the door) about 500mm (Figure 4a).
• Assemble the door arm as illustrated in Figure 4.
NOTE: When setting the up limit, the door should not
have a "backward" slant when fully open. A slight
backward slant as illustrated in Figure 4a will cause
unnecessary bucking and/or jerking whilst operating
the door from the fully open position.
HARDWARE
Nut Spring Washer
Clevis Pin X 2
Ring Fastener
Hex Bolt
Ring
Fastener
Door
Bracket
Clevis Pin
Lock
Washers
Nuts
Door Bracket
Lock
Nuts
Washers
Clevis Pin
500mm
15
Figure 1
Outer Trolley
Clevis Pin
Straight
Door Arm
Curved
Door Arm
Figure 2
Emergency
Release
Handle
Bolts
Figure 3
Bolts
Cut This End
Figure 4
Ring Fastener
Sprin g
Straight
Was her
Nut
Arm
Curv ed Arm
Bolts
CORRECT
Figure 4a
INCORRECT