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

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Master Lock 5400D (Please help!)

The protective weather cover will not open all the way. I cannot access the combination without being able to open the black cover all the way.

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Try lubricating with a silicone spray oil, And work the cover to try and free it.

If this has no effect, I suggest you visit a locksmith, that should be able to identify the fault.
If it is unable to be easily reached/ rectified, you may need to remove the cover entirely, or purchase a replacement lock.

Hope this helps.

Posted on Jun 12, 2008


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Related Questions:

1 Answer

How to reset combination

To set a new combination:
The initial combination is set at the
factory to 0-0-0-0
1. Open the compartment door
2. Push the reset lever left and down.
The lever remains in this position
3. Rotate dials to your desired combination
4. Push the reset lever, up and right, back
to the original position
5. Close the key storage compartment door
6. Scramble the combination dials to lock
the door and conceal your combination
7. Close the shutter door

Sep 03, 2014 | Master Lock 5400d: Portable Select Access...

1 Answer

How do you open a master lock model 5400d if you forgot the combination

It would appear that you made a mistake in setting your new combination on your Master Lock 5400d and did not register the combination at 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 you 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.

Jul 14, 2011 | Master Lock 5400d: Portable Select Access...

1 Answer

I have a 5400D Master lock.I changed the default combanation and hung it on my closet door and approx. two months later it remains there because I forgot the combo.I called Master Lock and was told its...

Master Lock would be thrilled to sell you a new lock. Run through the possible combinations, systematically, until you hit on the correct one. There are 10,000 of them. Shouldn't take any longer than a week.

Oct 26, 2010 | Master Lock 5400d: Portable Select Access...

1 Answer

The combination our Master Lock Co Combination Lock Box Part # 5401D was changed by accident. How do we find the combination to open the box?

No joke... trial and error... its not going to be fun, but work out a system so you don't cover the same number twice.

Aug 30, 2010 | Master Lock 5400d: Portable Select Access...

2 Answers

My master lock 1547 lock combination was changed and i cant open it

If you have the change key, you can insert into the lock and make a new combination. Only the Change Key witll allow you to change combination.

Jul 16, 2008 | Master Lock 5400d: Portable Select Access...

1 Answer

Master lock 5400D lock box

Master lock offer a free replacement service for locks which develop a mechanical defect during normal use.
See their website here for further information -

If the lock has been forced or tampered with to cause this problem, then a replacement is needed.

Hope this helps

Nov 14, 2007 | Master Lock 5400d: Portable Select Access...

3 Answers

Lock won't open

Have 5400D Master Lock. Know combination, but it will not open. Can someone help me?

Aug 18, 2007 | Master Lock 5400d: Portable Select Access...

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