Chamberlain B550 B550 B552 B750 Owner s Manual - English - Page 9

STEP 4 Install the belt,

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Assembly STEP 4 Install the belt 1. Pull the belt around the idler pulley and toward the trolley. The ribbed side must contact the pulley. 2. Hook the trolley connector into the retaining slot on the trolley as shown (Figure 1). 3. With the trolley against the screwdriver, dispense the remainder of the belt along the rail length toward the motor unit and around the sprocket (Figure 2). The sprocket teeth must engage the belt. 4. Check to make sure the belt is not twisted. Connect the trolley threaded shaft with the master link (Figure 3). l Push pins of master link bar through holes in end of belt and trolley threaded shaft. l Push master link cap over pins and past pin notches. l Slide the closed end of the clip-on spring over one of the pins. Push the open end of the clip-on spring onto the other pin. 5. Remove the spring trolley nut from the threaded shaft. 6. Insert the trolley threaded shaft through the hole in the trolley. HARDWARE Threaded Shaft with Spring Trolley Nut Master Link Figure 1 Trolley Connector Retaining Slot Figure 2 Sprocket Master Link Threaded Shaft Figure 3 9

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9
Assembly
STEP 4 Install the belt
1.
Pull
the
belt
around
the
idler
pulley
and
toward
the
trolley.
The
ribbed
side
must
contact
the
pulley.
2.
Hook
the
trolley
connector
into
the
retaining
slot
on
the
trolley
as
shown
(Figure
1).
3.
With
the
trolley
against
the
screwdriver,
dispense
the
remainder
of
the
belt
along
the
rail
length toward
the
motor
unit
and
around
the
sprocket
(Figure
2).
The
sprocket
teeth
must
engage
the
belt.
4.
Check
to
make
sure
the
belt
is
not
twisted.
Connect
the
trolley
threaded
shaft
with
the
master
link
(Figure
3).
l
Push
pins
of
master
link
bar
through
holes
in
end
of
belt
and
trolley
threaded
shaft.
l
Push
master
link
cap
over
pins
and
past
pin
notches.
l
Slide
the
closed
end
of
the
clip-on
spring
over
one
of
the
pins.
Push
the
open
end
of
the
clip-on
spring
onto
the
other
pin.
5.
Remove
the
spring
trolley
nut
from
the
threaded
shaft.
6.
Insert
the
trolley
threaded
shaft
through
the
hole
in
the
trolley.
HARDWARE
Master Link
Figure 3
Threaded Shaft with Spring Trolley Nut
Threaded Shaft
Master Link
Sprocket
Figure 2
Figure 1
Trolley
Connector
Retaining
Slot