Craftsman 139.53403 - Manual (Page 7)

Assembly
STEP 2
Install Trolley & Attach Chain Retainer Bracket
As a temporary stop, insert a screwdriver into
hole in front end of Tee rail as shown. Slide the
inner trolley onto the Tee rail until it is firmly against
the screwdriver,
NOTE: IftrolleyhitsagainstnutonTeerail,center
section was attached from wrong side and must
be repositioned. Review Step 1.
Slide the outer trolley onto theTee rail until it partially
engages the inner trolley and stops
TO FULLY ENGAGE TROLLEY: With a hammer,
firmly tap the back end of outer trolley just below the
rail guide, Outer trolley must move forward to fully
engage Inner trolley. Be careful to avoid damaging
trolley spring.
Outer
Nut
,,^5/16''
Lock Washer _
5/16" ''
Temporary Stop Inner
Screwdriver f^dt
b/16" ®
Cable
Pulley
Bracket
Chain
Retainer
Bracket
Threaded
End
Trolley
Shaft
Flat End
Attach inner nut, lock washer, chain retai ner bracket
and outer nut to trolley shaft in the order shown. DO
NOT TIGHTEN NUTS UNTIL STEP 5, PAGE 9.
STEPS
Attach Tee Rail to Opener Chassis
USE ONLYTHOSE SCREWS MOUNTED
INTOPOFOPENERCHASSIS. FAILURE
TO DO SO WILL CAUSE SERIOUS DAM­
AGE TO THE DOOR OPENER.
PROCEDURE; Place opener chassis on packing
ma terial to protect cover For convenience, place a
support under the cable pulley bracket.
Remove 5/16"-18x1/2" washered screws mounted
in top of opener chassis. Align holes in back end of
Tee rail with holes in opener chassis. Fasten the rail
to the chassis with washered screws previously
removed. CAUTION: USEONLYTHESESCREWS!
Use of any other screws will cause serious dam­
age to door opener. Tighten screws securely,
insert a 5/16"-18x1/2" washered screw into trolley
stop hole in the Tee rail as shown. Tighten securely
with a 5/16" nut,
Trolley
stop Hole
Tec Rail
(Back Section)