Chamberlain B1381C Owner's Manual page 8

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).
Push pins of master link bar through holes in end of belt and trolley threaded shaft.
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Push master link cap over pins and past pin notches.
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Slide the closed end of the clip-on spring over one of the pins. Push the open end of the clip-on spring
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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.
Threaded Shaft with Spring Trolley Nut
Master Link
Figure 1
Trolley
Connector
Retaining
Slot
8
HARDWARE
Figure 2
Sprocket
Master Link
Threaded Shaft
Figure 3