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Sentry R3786 combo change?

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Linsey 00H

Newbie

Posts: 3

Joined: Fri Nov 26, 2021 1:54 am

Post Fri Nov 26, 2021 2:44 am

Sentry R3786 combo change?

Hi. I'm new here. I have an old Sentry, about 1 cubic foot capacity, stamped R3786 upside down on the lower front face. I have the combination and have it open. 3 numbers. I want to change the combination. Where can I go to learn how to do this?
I am not quite all thumbs and familiar with most tools [righty-tighty-lefty-loosey etc.] :hammering:
It is too old for the Sentry Co. to have any information about this safe, so presently I know nothing about it.
I have the cover off the inside of the door and see a simple latch that slides into a slot in 3 stacked wheels retained by a captive type nut. The topmost or closest wheel has 12 holes with a screw in one of them.
I cannot see what is going on below this wheel and don't want to mess up and make this safe become scrap iron. :spinning: Lin.
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Alexander Mundy

User avatar

Familiar Face

Posts: 33

Joined: Sun Jun 13, 2021 2:27 am

Post Fri Nov 26, 2021 3:06 am

Re: Sentry R3786 combo change?

Pictures?
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jharveee

Prolific Poster

Posts: 989

Joined: Thu Aug 22, 2013 3:14 pm

Location: San Marcos, Ca.

Post Fri Nov 26, 2021 8:20 pm

Re: Sentry R3786 combo change?

Sounds similar to a sentry I had awhile back.
viewtopic.php?f=100&t=9956&p=90955&hilit=sentry+combo+change#p90937
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Linsey 00H

Newbie

Posts: 3

Joined: Fri Nov 26, 2021 1:54 am

Post Fri Nov 26, 2021 11:24 pm

Re: Sentry R3786 combo change?

Photo coming. Lin :camera:
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Linsey 00H

Newbie

Posts: 3

Joined: Fri Nov 26, 2021 1:54 am

Post Sun Nov 28, 2021 8:55 pm

Re: Sentry R3786 combo change?

jharveee wrote:Sounds similar to a sentry I had awhile back.
viewtopic.php?f=100&t=9956&p=90955&hilit=sentry+combo+change#p90937

Looks about the same inside. I have a screw in the hole in the wheel instead of the pin arm from the center bolt.
So the wheels are numbered 3,2,1, with #3 being the nearest to me when I take the cover off?
I'm beginning to think about how much it would cost to hire a pro. I have a particular desired combination in mind so I can remember it, not just any set of numbers.
I haven't yet learned how to post pix here.. :???: :slam:
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MartinHewitt

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Joined: Sat Nov 26, 2016 6:19 pm

Location: Germany

Post Sun Nov 28, 2021 9:01 pm

Re: Sentry R3786 combo change?

Click down below the button "Post Reply". Then you do have the full posting options. A bit below the text field is a tab "Upload Attachment". You can upload there photos.
In case you wonder ... Martin Hewitt is a fictional detective in stories by Arthur Morrison:
Martin Hewitt, Investigator Chronicles of Martin Hewitt
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jharveee

Prolific Poster

Posts: 989

Joined: Thu Aug 22, 2013 3:14 pm

Location: San Marcos, Ca.

Post Mon Nov 29, 2021 1:37 pm

Re: Sentry R3786 combo change?

Waiting to see the pictures. Most likely you will be selecting a predetermined combination, based on where you decide to place the screw.
Try moving the screw.
Dialing the new combination and then move the screw another hole and repeat. Track how moving the screw affects the combination.

****Do All combination changes with the door OPEN!*****
Test, verify and write down your new combination before closing the door.

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