Install the belt and attach the beltcap retainer, Assembly step 4, Install the belt and attach the belt cap retainer – Chamberlain 248754 User Manual
Page 10
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To avoid possible SERIOUS INJURY to fingers from moving
garage door opener:
• ALWAYS keep hand clear of belt pulley while
operating opener.
• Securely attach belt pulley cover BEFORE operating.
T rolle y
Connector
Idler Pulley
Retaining
Slot
Hole
Master Link
Clip-On Spring
Master Link Cap
T rolle y
Threaded
Shaft
Master
Link Bar
Pin
Notch
Hex Screw 8x3/8"
HARD W ARE SHOWN ACTUA L SIZ E
Spring/ T rolley Nu t
Spring Nut
8x3/8" Hex Screws
Belt Cap Retainer
Mounting Plate
Motor Unit Belt Pulley
Trolley
Connector
Idler Pulley
Retaining
Slot
Hole
Master Link
Clip-On Spring
Master Link Cap
Trolley
Threaded
Shaft
Master
Link Bar
Pin
Notch
8x3/8" Hex Screws
Belt Cap
Retainer
ASSEMBLY STEP 4
Install the Belt and Attach the Belt
Cap Retainer
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.
3.
With the trolley against the screwdriver, dispense the
remainder of the belt along the rail length toward the
motor unit and around the belt pulley. The belt pulley
teeth must engage the belt.
4.
Check to make sure the belt is not twisted and the
FLAT side of the trolley threaded shaft is facing the
rail. Connect the trolley threaded shaft with the master
link, as illustrated:
•
Push pins of master link bar through holes in end of
belt and trolley threaded shaft.
•
Push master link cap over pins and past pin
notches.
•
Slide clip-on spring over cap and onto pin notches
until both pins are securely locked in place.
5.
Insert the trolley threaded shaft through the hole in
the trolley. Be sure the belt is not twisted, and the
FLAT side of the trolley threaded shaft faces the rail.
6.
Hold the belt at the trolley shaft as you thread the
spring nut by hand onto the shaft until finger tight
against the trolley. Do not use any tools.
7. Remove the screwdriver.
8.
Position the belt cap retainer over the motor unit belt
pulley as shown and fasten to the mounting plate with
8x3/8" hex screws provided.