Install The Trolley; Attach The Rail To The Motor Unit - Craftsman 139.53648D Owner's Manual

ASSEMBLY STEP 2
Install the Trolley
• Attach the trolley threaded shaft to the trolley with
the lock washer and nuts as shown.
• As a temporary stop, insert a screwdriver into the
hole in the front end of the rail.
• Slide the trolley assembly along the rail to the
screwdriver stop.
NOTE: If trolley hits against any nuts on the rail,
the bolts and nuts were attached from the wrong
side and must be repositioned.
Review Assembly Step 1.
Trolley \
Outer Nut
5/16"
Lock Inner Nut
Washer 5/16"f
5/16" i _"'.
Trolley
Threaded
Shaft
HARDWARE SHOWN ACTUAL SIZE
Temporary Stop
Lock Washer
5/16"
©
Nut
5/16"- 18
ASSEMBLY STEP 3
Attach the Rail to the Motor Unit
To avoid installation difficulties, do not run the
garage door opener until instructed to do so.
• Place the opener on packing material to protect
the cover. For convenience, put a support under
the cable pulley bracket.
• Remove the two washered bolts mounted in top of
motor unit.
• Align the holes in the back section of the rail with
the holes in the motor unit.
• Fasten the rail with the two washered bolts
previously removed. Tighten securely.
Use only these bolts! Use of any other bolts will
cause serious damage to door opener.
• Insert a 5/16"-18x7/8" hex bolt into the cover
protection bolt hole in the rail as shown. Tighten
securely with a 5/16" lock washer and nut.
NOTE: This bolt prevents trolley over-traveL Keep a
2" (5 mm) minimum between the trolley and this bolt
when adjusting travel limits (see page 27).
To avoid SERIOUSdamageto opener, ONLYuse
bolts/fasteners mounted in top of motor unit.
Washered Screw
5/16"-18xl/2"
Hex Bolt
5/16"-18x7/8'
Cover
Protection
Bolt Hole \
Rail
(Back Section
5/16"
Nut
5/16"-18
HARDWARE SHOWN ACTUAL SIZE
©©
Hex Bolt Nut Lock Washer
5/16"-18x7/8" 5/16"-18 5/16"