Craftsman 139.53785 User manual

CRRFTSHRN®
OWNER'S INSTRUCTIONS Model 139.53785 Ten-Foot Rail Extension Kit
Close door end disconnect power to the garage
The tro#ey must be /n down (closed door) posit/on
during asmanibly and Installation. If you have a
completely installed garage door opener, the rail/opener
assembly must be taken down. UP and DOWN Umlte
mustbe readjusted after installation.
Opener hanging brackets will require reposltioningdue to
increased rail length.
ff thl$ Is a new Inatallatlon, replace the front(header)
rail in your opener carton withthe longerone in this kit.
Add the center rail in this Idtas the second or third rail,
creating a four rail assembly. Use the belt assembly and
longer emergency release rope in this kit in place ofthose
packaged with your opener. Complete the assembly,
Installation, and adjustment of your opener according to
yourOwner's Manual.
ff thl# Is an existing InatMlatlon, oontinue _follows:
1. Pull down on the emergency release handle, then
disconnectthe trolley from the door arm.
2. Disconnectthe rail/opener assembly from the header
bracket and hanging brackets, and place iton the
floor.
3. Remove the bell cap retainer from the opener
sprocket and set aside.
4. Disconnectthe master link from the trolley threaded
shaft and belt; discard.
5. Remove the spring/nut from the trolley and dlscerd,
6. Remove idler pulley assembly and set aside.
7. Remove the hall assembly and discard.
8. Remove the 1/4"-20xl-3/4 bolt and lock nutfrom the
trolley stop hole (see Figure 1) inthe front railand set
aside.
9. Push the trolley beck toward the opener head.
Disconnect the frontrail section by using a
screwdriver tip to pry up the outer tab on each side of
the rail, then slide itoffthe center rail Discard the
front rail
10. Alignthe new frontrailand center railswith the
existingrailassembly, keeping the small holes along
the same edge, and the cut out =window" at the front
(header) end. Be sure to keep rails rightside up: the
idlerpu/ley bolthole above the windowls larger on top
of the ra#than on the bottom. SIIde the new nentsr rel!
ontothe assembly; then add the front rail.Tabs along
the side will lock intoplace.
11. As a temporary trolley stop,clamp a locking pliers
ontothe rail, 8" from the center of the idler pulley
hole, as shown in Figure2. Slide the trolleyassembly
to this point
12. Lay the new bell beside the rail as shown in Rgurs 3.
Grasp the end with the hooked trolleyconnectorand
Figure 2
RAIL
lookingPlkn 8"from
Id_r
Hole
Cut-Out
F/gure 3
3/8"Lock Trolley Idler
Connector Pulley
passapproximately 12" ofbelt through the window,
keeping the dbbed side towardthe rail. Allow itto
hangwhile you complete the next two steps.
13. Replace the idler pulley, lockwasher and nut. Rotate
itto be sure it spinsfreely. Grease the center if
necessary.
14.Replace the the 1/4"-20xl-3/4 belt and lock nut into
the trolley stop hole.

15. Pull the belt around th_ Idler pulley and hook the
trolley connector intothe retaining slot on the trolley
as shown in Figure 4. The fibbed side must contact
tbepu/_y.
16. With the trolley against the pliem, dispense the
remainder of the belt along the rail assembly toward
the powerhead and around the sprocket. The
sprocket teeth must engage the belt.
17. Check to make sure the boltis not twisted, then
connect it to the fiat end of the trolley threaded shaft
with the master |ink, as shown:
•Push pins of master link bar through holes in end
o1bert and trolley threaded shaft.
• Push master link cap over pins and past pin
notches.
• SUde dip-on epring over cap and onto pin notches
unti| both pins are securely locked in place.
18. Insert the trolley threaded shaft through the hole in
the trolley. Be sure the belt is not twistS, and the
fibbed side faces the rail
19. Hold the bert at the trolley sh_ft as you three,d the
spring nut by hand (Figure 5) onto the shaft until
finger tight against the trolley. Do not use any tools.
20. Remove the Iocldngpliers.
21. Set the belt tension:
• Insertascrewdrivertip intoone o_the nut ringslots
andtxe e ¢rr yag nstthetroney,as
• Place a7/16' opefl end wreflch no the square end.
Rotate the nutebout 1/4 turnuntUthe spdng raieases
and sneps the out ringagolnst ti_etrolley,Rgure 6.
ThissetsmespringtoopSrnumbe|ttensinn.
22. Replace the belt cap retainer and complete the re-
installation and adjustment of your opener accon:ling
to your owner's manual.
23. Replace the old emergency release rope with the
new, longer replacament rope.
24. Reconnect power and operate the door in the UP
direction.
25. Increase the UP travel limit by turning the UP limit
adjustrnent screw in a olockwtse direc_on as shown
on label. One turn equals 2" of travel
IdlelPulhby
Hole
•e_Jm S
Slot
End
Trolley
_._ER RELEASI_
1-1)4"
partNo. Oe_rlpUen
183C158-11 ..... Header tail extension ........ 1
183C157-8 ...... Center rail extension ........ 1
1A5250-2 ....... 10' Belt Assembly ........... 1
26A53 ......... Rope ..................... 1
1A995 ......... Master Unk Kit ............. 1
1A5019 ........ Spring Nut Assembly ........ 1
2
01999,Sear=,Roebuck&Co.
/dlRightsI=k_m_d114A2407 PdntedinMexico