Question about Chamberlain Powerdrive PD422D 1/2 HP Security Plus Screw Drive Garage Door Opener

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Travel adjustment Can not seem to locate the travel adjustment screws

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They are on the side of the opener. There are two holes with an arrow wrapped around the holes. You should be able to see the screws inside the holes. If you can find the holes and dont see the screws, someone has put the cover on in the opposite direction. You wil have to take the cover off and turn it around.

Posted on Jan 27, 2009

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How to adjust a deraihller on a 1969 schwinn stingray


On a bike this old, your derailleur well be a friction shift style. These are simple. You should find two small screws, usually located close together, usually Phillips head. They may be labeled "H" and "L". This stands for high and low, respectively. The H screw sets the travel limit to the outer most gear, the smallest one in the cluster. The L screw, is just the opposite, setting the travel to lowest gear or largest cog nearest the spokes. Once you have the limits set, put the shifter into "high" gear (chain on the smallest cog), loosen the nut or bolt on the der. that pinches the cable, pull the cable tight with one hand and tighten the pinch bolt/nut with your other hand. Badda-boom! That's it. Test it out, make sure you are not over shifting, if so make minor adjustments to the high/low screws. Once these are set, you rarely ever need to adjust them. All other adjustments are made to the cable tension.

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How do i set the travel limits on my craftsman garage door opener 139.53919


  • Open the garage dooricon1.png fully by pressing the wall control button. The bottom section of the door should be right at the header in the "full open" position. If it is too far back, the door cable can become misaligned. If it is not back far enough, you may not be able to get your vehicle in and out of the garage.

  • 2

    Position a stepladder behind the garage door openericon1.png motor. Locate the limit adjusting screws on the left side of the motor housing. Have a friend stand by the wall control button.

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  • 3

    Insert a screwdriver into the slot for the "up limit" adjustment screw. Turn it to the right to decrease the door travelicon1.png and turn it to the left to increase it. Turn the screw in small increments.

  • 4

    Close the garage door by having your helper push the wall control button. Notice the seal between the door and the floor--there should not be any light coming through. Adjust the "down limit" screw in the same way if necessary.

  • 5

    Operate the door by the pressing the wall button and check your adjustments.



  • Read more: How to Adjust a Craftsman Garage Door Opener ' eHow.com http://www.ehow.com/how_5419011_adjust-craftsman-garage-door-opener.html#ixzz2Hm1tx0a0

    Jan 12, 2013 | Sears Craftsman LiftMaster Chamberlain...

    1 Answer

    I have a ribble sportif racing bike and there is one gear i cannot get,i have tried cleaning and lubricating all around the rear derailleur but to no avail,could you please advise


    There are two screws that limit the "travel" of the deraileur. They will be about 3/4 inch apart. One screw limits how far OUT the derailler will travel (for the smallest cog) the other limits how far IN (for the largest cog). Loosening (turning it to the left a little) either screw will allow the deraileur to travel a little further. If it travels too far, your chain will overshoot the last cog. You might be able to see which screw to adjust, or just do it by trial and error. There is more in-depth at http://www.parktool.com/blog/repair-help/rear-derailler-adjustments-derailleur they make great tools and have a terrific site with how-to videos and diagrams.

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    I have a craftsman 3/4 garage opener. When it is traveling down it will contuniue past the adjusted stopping point and keep going untill it runs out of track and then travel back up.. It seems to only...


    It sounds like your door is traveling just a bit too far in the down direction. Locate the 'down limit' adjustment on the side of your motor unit and turn this control a bit in the opposite direction of the arrow printed on the cover. Some tweaking will then be necessary to get it just right.

    Oct 13, 2010 | Sears Craftsman LiftMaster Chamberlain...

    1 Answer

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    You did not sync the chain correctly. If you have not touched the travel limits, take chain off sprocket and run door to either up or down position. Put chain back on with trolley in up or down, accordingly. Tension and make final travel adjustments.

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    1 Answer

    Door opens about 1 foot too far, the use of the travel up screw either appears to do nothing or it does too much when adjusted. How do you know how many inches the screw is affecting in a turn (or partial...


    Are you turning travel screw, or force screw? If travel, One is for how far up and other is for how far down. Insert screwdriver into UP adjustement and turn it opposite direction of arrow. Try 2-3 turns to start. Yu may have to turn back CW. If while adjusting door just stops, go have a cup of coffee. You overheated motor. Give it 15 minutes to cool down.

    Dec 17, 2009 | Sears Craftsman LiftMaster Chamberlain...

    1 Answer

    My garage door seems to want to travel too far up and down. The travel adjustment screws don't seem to do anything (almost like they're at the end of their adjustment range). Door height and all is...


    If you haven't you should remove the cover and watch the limit switch assembly. If it is making contact when it should but the door keeps traveling you have a bad logic board.

    Dec 15, 2009 | Sears Craftsman LiftMaster Chamberlain...

    3 Answers

    Can the travel limits on a Chamberlain security+ be reset?


    If you are at the back of the operator looking toward the door the limit adjustment should be on the left hand side.
    The adjustment closest to the door is the down limit turn that 3 turns clockwise. The adjustment screw furthest from the door is the up limit turn this screw 3 turns counterclockwise. That should get you close to factor settings. If this does not work; remove the cover on the operator sometimes the limit assy. come apart.

    Oct 01, 2009 | Sears Craftsman LiftMaster Chamberlain...

    1 Answer

    Adjusting front derailer


    Typically adjusting the front derailleur is a matter of adjusting the two adjusting screws on the derailleur. So turn the bike upside down. It should sit on its seat and handle bars. Find the two adjusting screws one will prevent the derailleur from traveling too far out preventing the chain from coming off. The other screw prevents the derailleur from traveling too far in keeping the chain from falling off that way. Now once you have found the screws slowly start turning the pedals like it was being ridden. Move the derailleur out as far as it will go if you see the chain is about to come off adjust the screw. Do same for inside screw. Now move the back derailleur all the way in and retest front derailleur, repeater with rear derailleur all the was out. Hope that helps. Oh, the back derailleur adjusts same way.

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    there are two small screws located on the derailleur. Hi/Low
    http://www.parktool.com/repair/
    this might help too

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