Chamberlain WHISPER DRIVE WD912K - Manual (Page 9)

9
ASSEMBLY STEP 2
Install the Trolley
• 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.
• Insert a 5/16"-18x7/8" hex bolt into the trolley stop
hole in the rail as shown. Tighten securely with a
5/16" lock washer and nut. This bolt limits trolley
travel in the DOWN direction.
Trolley
Temporary Stop
Screwdriver
Hex Bolt
5/16"-18x7/8"
Trolley
Stop Hole
Lock
Washer
5/16"
Nut
5/16"-18
ASSEMBLY STEP 3
Fasten the Rail to the Motor Unit
• Place the opener on packing material to protect
the cover. For convenience, put a support under
the belt pulley bracket.
• Remove the two 5/16"-18x1/2" washered bolts
mounted in the top of the 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.
Remember to use only these bolts! Any other
bolts will cause serious damage to the
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" minimum between the trolley and this bolt when
adjusting travel limits (see page 28).
USE ONLY THIS
TYPE AND SIZE
BOLT
Washered Bolts
5/16"-18x1/2"
Rail
(Back
Section)
Cover Protection
Bolt Hole
Nut
5/16"-18
Hex Bolt
5/16"-18x7/8"
Lock Washer
5/16"
Nut
5/16"-18 Lock Washer
5/16" Hex Bolt
5/16"-18x7/8"
HARDWARE SHOWN ACTUAL SIZE
To avoid serious damage to opener, ONLY use
bolts/fasteners mounted in top of motor unit.
WARNING
CAUTION WARNING
WARNING