Modern-ish Yale Door Handle and Deadbolt

[latch-key-kid]

I am working on this Yale door handle and deadbolt lock at my wife's office. The deadbolt is super dry and won't fully extend. Also, it appears that the "key" for this deadbolt is some kind of square peg. I'd like to know what this setup is called so I can do some more research on it and maybe acquire a new "key". I'd also welcome any tips on disassembling and lubricating it. Disassembly looks easy enough, but maybe I'm over confident.

[Raymond]

That Yale is a "Privacy" lock for restrooms. The lock on the outside IS just a square bypass for when someone (elderly, child, medical emergency, etc.) locks themselves in and cannot get out. Any square piece of steel that fits in the square behind the outer plate should work. Even the tip of a medium screwdriver.

Lubing the bolt is easier with the lock body completely out but some success might happen if you just remove the plate on the edge of the door. Two 8-32 screws. That will open up enough gaps and access holes to spray a long lasting liquid lube in. Use a small flashlight and watch how the bolt is pushed in and out with a pin in a long, slanted hole. That kind of mechanical motion transfer is notorious for sticking and being hard to move after a few dry years.

[latch-key-kid]

Huge thanks! And, yes, it is the privacy lock on a restroom.

That Yale is a "Privacy" lock for restrooms. The lock on the outside IS just a square bypass for when someone (elderly, child, medical emergency, etc.) locks themselves in and cannot get out. Any square piece of steel that fits in the square behind the outer plate should work. Even the tip of a medium screwdriver.

Lubing the bolt is easier with the lock body completely out but some success might happen if you just remove the plate on the edge of the door. Two 8-32 screws. That will open up enough gaps and access holes to spray a long lasting liquid lube in. Use a small flashlight and watch how the bolt is pushed in and out with a pin in a long, slanted hole. That kind of mechanical motion transfer is notorious for sticking and being hard to move after a few dry years.

[demux]

Just another quick note here: in your original post you mention this is at your wife's office. You did not mention anything about also being employed there, particularly as a locksmith, maintenance mechanic, etc. Before you go doing any of this, I would strongly suggest that you check with the powers that be at her office and secure permission to proceed. We do not condone messing with locks you do not own, unless you have permission from the owner. While unlikely with the procedures suggested, there's always a possibility that you could end up causing more damage that turns into a fairly expensive repair...

[billdeserthills]

I like to take the mortise lock case out and grease all moving parts with a synthetic teflon grease like Super Lube--
Spray lube doesn't last long at all

[GWiens2001]

I like to take the mortise lock case out and grease all moving parts with a synthetic teflon grease like Super Lube--
Spray lube doesn't last long at all

+1

If you have not taken apart a mortise box assembly like that, it is best to ask a few questions here and we can give some tips BEFORE you take off the cover of the box. This is NOT just an idle warning/tip. I, and others here, can give you some tips that can REALLY save you some problems. Once you take off the cover incorrectly, it is much more difficult to correct any issues that can occur.

If you have taken one apart before, then I apologize for giving a warning you would already be well aware of.

Gordon

[demux]

I'll second Gordon's warning, and note that it's not just a matter of convenience putting the box back together - it's also a safety thing. There's a lot of spring tension in some unexpected places inside one of those boxes, if you're not aware of that you can easily have parts flying out at you if you snag the wrong thing with the cover as it's coming off. Be particularly mindful of the hubs. I'll sometimes take a small bolt and run it through them and fix it to the back of the case with a washer to make sure nothing pops out.