How to remove this knob?

[yogibayer]

This is an old Yale Mortise Lock and the (outside) knob appears to have a set screw hole in it, but whatever is in there is completely flat with no slot or phillips screw head. There are no similar holes on the inside knob. Any help in identifying what model of lock it would be helpful too.

[2octops]

http://extranet.assaabloydss.com/librar ... 6-12RE.pdf

[Evan]

This is an old Yale Mortise Lock and the (outside) knob appears to have a set screw hole in it, but whatever is in there is completely flat with no slot or phillips screw head. There are no similar holes on the inside knob. Any help in identifying what model of lock it would be helpful too.

@yogibayer:

What is the issue with that lock which requires you to remove the knob ?

That lockset in use in a commercial building, is it broken or something ?

As far as what type of lockset you have there it looks like a Yale 8847,
ANSI Function 20 (Entrance or Apartment Door Lock) with a deadbolt
function as well as stop works to allow the outside knob to be unlocked...

Care to describe in more detail what the problem with the lock is ?

~~ Evan

[maintenanceguy]

usually, you need to have the key to remove the knob on a commercial lock like this.

Rotating the key to 90º (or some other angle) allows any small pointed tool to release the knob by pressing against a locking tab inside that little hole.

You need to rotate the key to get access.

If there's no key, you can try rotating the collar with the hole until you see the tab you need to press against.

[yogibayer]

This is an old Yale Mortise Lock and the (outside) knob appears to have a set screw hole in it, but whatever is in there is completely flat with no slot or phillips screw head. There are no similar holes on the inside knob. Any help in identifying what model of lock it would be helpful too.

@yogibayer:

What is the issue with that lock which requires you to remove the knob ?

That lockset in use in a commercial building, is it broken or something ?

As far as what type of lockset you have there it looks like a Yale 8847,
ANSI Function 20 (Entrance or Apartment Door Lock) with a deadbolt
function as well as stop works to allow the outside knob to be unlocked...

Care to describe in more detail what the problem with the lock is ?

~~ Evan

This particular lock is working fine, but there is another one with some issues, which the customer hasn't been able to describe to me yet. As I repair/replace these locks he wants to be able to switch from knobs to levers. From the 8800 description I can see that the lever locks have heavier duty springs to prevent sag. So I probably can't just swap out the knobs for levers as the customer was hoping.

[yogibayer]

usually, you need to have the key to remove the knob on a commercial lock like this.

Rotating the key to 90º (or some other angle) allows any small pointed tool to release the knob by pressing against a locking tab inside that little hole.

You need to rotate the key to get access.

If there's no key, you can try rotating the collar with the hole until you see the tab you need to press against.

Not in this case, since it's a mortise lock and the locking mechanism occurs inside the body of the lock and there is no cylinder in the knob.

[yogibayer]

http://extranet.assaabloydss.com/library/catalogs/Yale/pdf/42002%20YA%208800%206-12RE.pdf

According to the installation instructions I should be seeing an allen set screw inside of the hole. I will have to take a look at other locks on the building and see what I find.

Thank You

[2octops]

usually, you need to have the key to remove the knob on a commercial lock like this.

Rotating the key to 90º (or some other angle) allows any small pointed tool to release the knob by pressing against a locking tab inside that little hole.

You need to rotate the key to get access.

If there's no key, you can try rotating the collar with the hole until you see the tab you need to press against.

Negative

[Evan]

This particular lock is working fine, but there is another one with some issues, which the customer hasn't been able to describe to me yet. As I repair/replace these locks he wants to be able to switch from knobs to levers. From the 8800 description I can see that the lever locks have heavier duty springs to prevent sag. So I probably can't just swap out the knobs for levers as the customer was hoping.

As far as repairing/replacing those locks I would keep all the trim in the building the same until the owner wants to go through the expense of swapping them all out at the same time... Having some door locks with accessible trim and others not in a piecemeal fashion is likely to provoke ADA complaints from tenants who have not had the trim replaced, visitors to the building who see some doors with and others without...

That sort of process is just better done all at once on every door in the building rather than one by one as they need service...

If the building was being remodeled to any extent and enough of the building was being worked on, accessibility issues like door hardware, ramps and elevators would be required to make 100% of the building accessible to those with mobility issues... Also noteworthy is that building code often requires installation of modern fire alarm systems and sprinkler protection even in existing structures whenever a certain percentage or cumulative area of the building has been remodeled...

~~ Evan

[cledry]

This is an old Yale Mortise Lock and the (outside) knob appears to have a set screw hole in it, but whatever is in there is completely flat with no slot or phillips screw head. There are no similar holes on the inside knob. Any help in identifying what model of lock it would be helpful too.

Put a spanner wrench in the hole on the inside knob and rotate, then the knob will slide off. Looks like an 8700 series. Most Yale lever mortise use a set screw, but not the knobs.

I don't think you can retrofit to levers without swapping the body though.

[cledry]

It may be the spindle is installed with the knobs reversed.