Install The Trolley; Attachthe Rail To The Motor Unit - Craftsman 139.536481DM 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.
Lock Inner Nut
As a temporary stop, insert a screwdriver into the hole in the Washer5/16"
front end of the rail.
5/16"
Slide the trolley assembly along the rail to the
Outer Nut _ Trolley __
screwdriver stop. 5/16" _j Thh_ded _""_'_ T_lle
NOTE:If trofley hits against any nuts on the rail, the _
_ _ /.2_"'" _
Y
bolts and nuts were attached from the wrong side
Trolley ,_ _ /_/
/
and must be reposifioned. Review Assembly Step ( _-/_ _ __/ P
'
/_ Nut
St°O 5/16-18
Lock Washer
5/16"
ASSEMBLY STEP 3
Attachthe Rail to the Motor Unit
To avoid installation difficulties, do not run the garage door opener
until instructed to do so.
• Placethe opener on packing material to protect the cover. For
convenience, put a support under the cable pulley bracket.
• Removethe 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.
• Fastenthe rail with the two washered bolts previously removed.
Tighten securely.
Use onlythese bolts! Use of any otherbolts will causeserious
damage to dooropener.
• 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 (seepage 27).
HARDWARESHOWN ACTUALSIZE
Hex Bolt Nut
5/16"-18x7/8" 5/16"-18
Lock Washer
5/16"
To avoid serious damage to opener, ONLY use bolts/fasteners
mounted in top of motor unit.