Install The Trolley; Attach The Rail To The Motor Unit - Craftsman 139.536481DM Manual Del Propietário

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.
ASSEMBLY STEP 3

Attach the Rail to the Motor Unit

To avoid installation diffi culties, 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).
HARDWARE SHOWN ACTUAL SIZE
Hex Bolt
5/16"-18x7/8"
Trolley
Temporary Stop
Screwdriver
Nut Lock Washer
5/16"
5/16"-18
Inner Nut
Lock
5/16"
Washer
5/16"
Outer Nut
Trolley
5/16"
Threaded
Shaft
To avoid serious damage to opener, ONLY use bolts/fasteners
mounted in top of motor unit.
Washered Screw
5/16"-18x1/2"
Hex Bolt
5/16"-18x7/8"
Cover
Protection
Bolt Hole
Rail
(Back Section)
Lock Washer
5/16"
Nut
5/16"-18
9
HARDWARE SHOWN ACTUAL SIZE
Nut Lock Washer
5/16"
5/16"-18
USE ONLY
THIS TYPE AND
SIZE SCREW
Trolley