Chamberlain 8550W - Page 11


!SSEMBLY
 !TTACH THE #HASSIS 3UPPORT "RACKET
-/$%,3 7 7, !.$ 7,"
4O AVOID POSSIBLE 3%2)/53 ).*529 TO FINGER FROM MOVING GARAGE DOOR OPENER
z !,7!93 KEEP HAND CLEAR OF SPROCKET WHILE OPERATING OPENER
z 3ECURELY ATTACH SPROCKET COVER "%&/2% OPERATING
 0OSITION THE CHASSIS SUPPORT BRACKET ON THE UNIT

!TTACH THE BRACKET TO THE RAIL WITH Ñ X Ñ HEX BOLTS AND LOCK WASHERS $O NOT
OVERTIGHTEN
 !TTACH THE BRACKET TO THE OPENER BY INSERTING A Ñ X Ñ WASHERED SCREW THROUGH A HOLE
IN EACH SIDE FLANGE AND A MATCHING HOLE IN THE BRACKET #OMPLETE THE CONNECTION BY INSERTING
THE  X Ñ SCREW THROUGH THE BACK FLANGE AND THE HOLE IN RAIL SUPPORT
Washerd Bolt
5/16"-18x1/2"
Screw
#8-32x3/8"
Hex Bolt
1/4"-20x5/8"
Lock
Washer
 4IGHTEN THE #HAIN
 ,OOSEN THE INNER NUT AND LOCK WASHER ON THE TROLLEY THREADED SHAFT
 4IGHTEN THE OUTER NUT UNTIL THE CHAIN IS A Ñ ABOVE THE BASE OF THE RAIL AT THE MIDPOINT OF THE
RAIL
 2ETIGHTEN THE INNER NUT
3LACK IN THE CHAIN IS NORMAL WHEN THE DOOR IS CLOSED .O READJUSTMENT IS NECESSARY
-ODEL 7," /NLY )F THE TENSION IS NOT CORRECT WITH A g RAIL INSTALLED REMOVE TWO LINKS FROM THE
CHAIN TO SET THE CORRECT TENSION
1/2" (13 mm)