Question about Master Lock 5400d: Portable Select Access Key Storage Lock

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My Brass Master Lock Combination Lock is refusing to unlock. A couple of the combo numbers seem to be "sunk in" a bit. I tried WD40 but still will not unlock and I need to open my gate. This lock is only less than a year old. Help!

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  • ccforsure Jul 18, 2008

    Unfortunately, all three of us went out to put in the "right combination".  We all use this lock daily as we enter into our backyard gate. Earlier in the day, I had heard an "explosive" sound in the area of the lock but didn't see anything. This is a 4 digit combo for the 175D, I found the packaging. Don't see how putting in the numbers the opposite way would be successful or how three of us would not put in the right combination.

  • ccforsure Jul 18, 2008

    I am sorry to disagree with you and the locksmith but listen carefullly, the lock is locked onto the gate - it is closed. My packaging says that the lock combo can only be changed when the lock is OPEN. I am stuck with the lock that won't OPEN. Yes, we are using the right combo, has been the same combo for over 5 years. Yes, we have a key but that does no good when the lock is locked, and my husband does not have bolt cutters. I guess we will have to find bolt cutters and send to MasterLock.

  • Anonymous Mar 27, 2014

    Samsung gusto was searching on phone checked box marked nam 2 . mistake!it locked phone with 4 digit number tried all of carriers lock codes. did not work. need code to unlock or a way to reset phone manually.

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You need to make sure you are putting the righ combination. Try to put it the opposite way also for example

3645 or 5436

How many numbers are in the combination?...if it is a 3 number system it should be easy.
Artgirl

Posted on Jul 18, 2008

  • DASEP
    DASEP Jul 18, 2008

    175D comes with a change key. With that key you can change the combination as many times as you want. Who has the key?



    I think someone change the combination. Lock at you lock there must be a little whole on the side for that change key.



    Believe me I work in a locksmith store. I just consulted with the locksmith and we both saw the lock with the change key. Who bought the lock?

    Artgirl

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I unlocked my lock and set my new password but when i tried to oped it it wont openn itss very frustratin !


It would appear that you made a mistake in setting your new combination on your Master Lock 5400d. The only way to open your lock is by using the correct combination. There is no other way. Most mistakes are normally one or two digits out, so yo may wish to try variations on what you thought you set.

Apart from that you can either try every possible combination or you will need to contact the manufacturer. But they cannot assist you if the lock does not have a serial number (they recently stopped applying serial numbers for greater security) and they will not assist if the lock is already secured to anything. There are a number of other hurdles as well, click here for details. Given that they state that you will have to wait four to six weeks for an answer, it's going to be far quicker to just try every possible combination

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