Craftsman 139.53903DM Owner's Manual page 25

INSTALLATION STEP 12
Connect Door Arm to Trolley
Follow instructions which apply to your door type as illustrated
below and on the following page.
SECTIONAL DOORSONLY
• Make sure garage door is fully closed. Pull the emergency
releasehandle to disconnect the outer trolley from the inner
trolley. Slide the outer trolley back (away from the pulley) about
8" (20 cm) as shown in Figures 1, 2 and 3.
• Figure 1:
- Fastenstraight door arm section to outer trolley with the
5/16"x1" clevis pin. Securethe connection with a ring
fastener.
- Fastencurved section to the door bracket in the same way,
using the 5/16"x1-1/4" clevis pin.
• Figure 2:
- Bring arm sections together. Find two pairs of holes that line
up and join sections. Select holes as far apart as possible to
increase door arm rigidity.
• Figure 3, Hole alignment alternative:
- If holes in curved arm are above holes in straight arm,
disconnect straight arm. Cut about 6" (15 cm) from the solid
end. Reconnectto trolley with cut end down as shown.
- Bring arm sections together.
- Findtwo pairs of holes that line up and join with bolts, lock
washers and nuts.
• Pull the emergency release handle toward the opener at a
45° angle so that the trolley releasearm is horizontal. Proceed
to Adjustment Step 1, page 27. Trolley will re-engage
automatically when opener is operated.
Figure I
Figure2
Pulley
,, ,,
;(-- 8" (20 cm) pin. --)',
Trolley /O ZI_ 0
Stop Bolt _ Inner
I I_lI 9ut,_ 'r
/ Tro,,eyl I
_ Trolley
Ring " I_l
x',a
- . IOl _ Clevis _in
i-astener
lil H
5)1_6"X1"
Emergency
Door I°1 _ Handle
z Bracket
IOl
_ _ Straight
_,,_Z - Door Arm
C)_isP_n/4:,8 _ Curved Door Arm
Pulley
Door Bracket
Bolts
5/16"-18x7/8"
HARDWARESHOWN ACTUALSIZE
Clevis Pin
5/16"xl" (Trolley)
Lock Washer 5/16" ' er
Clevis Pin Hex Bolt
5/16"x1-1/4" (Door Bracket) 5/16"-18x7/8"
Figure3
Pulley
i i
:{_8" (20 cm) pin. _.}',
_-._-.__T_ _ . _ .
_J_--_ J __ _---,,.
Trolley / / ff
Stop Bolt / /
Lock /o/
Washers/c7
Nuts 5/16" /o7
25