LiftMaster DUALAUXTROLLEY41 Mode D'emploi page 2

INSTALLATION (CONTINUED)
3. Determine the rough spacing of the two tracks, generally they
are separated by 1/3 to 1/2 the door width. We have supplied
a cross header shaft that is one half the door width.
4. Assemble the operator per the installation manual but with the
drive chain front idler and coupler assembly at the header end
of the track in place of the standard front idler. Be sure the
coupler assembly is towards the center of the door.
5. Assemble the second track the same way as the operator but
at the operator end of the track install a standard front idler
provided in the operator packaging. Be sure the coupler
assembly is towards the center of the door. Add the 8" chain
length to the operator chain which was provided in the
accessory pack. Remove excess chain from secondary qrail
assembly as necessary.
6. Install the operator in the location that was determined in
steps 1 and 2.
7. Install the second track assembly, taking care that the two
tracks are parallel to each other.
8. Install a 48B14 sprocket on one end of the cross header shaft
by drilling through the hub and shaft and securing with a
1/4" x 1-1/2" roll pin. Be sure that the shaft is flush with the
sprocket (Figure 2).
9. Determine the distance between the two coupler sprockets on
the track assemblies and cut the cross header shaft to that
length. If the shaft is too long and is sagging in the middle,
you may have to install one or two bearings for extra support.
Install the second 48B14 sprocket to the end of the shaft,
securing in place the same way as the sprocket in step 8
(Figure 2).
10. Check to see that the two trolleys are spaced the same
distance from the header so that the two door arms will be
parallel.
11. Install the cross header shaft by butting the sprockets on the
shaft against the sprockets on the idle assemblies and
connect them with the #40 chain and master link (Figure 3 ).
12. Reconnect power to operator.
To prevent damage to door, both door arms MUST be
connected to door prior to activating the operator.
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