Air tool issue

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e9999

Gotta get out there...
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OK, did a garage sale yesterday and came back with a bunch of tools. Out of many, there were 2 that aren't working. Both not worth spending serious money on but I'd like to fix them for the heck of it and to learn something.

First one is a dual action air sander (UT 2105, a UK affair apparently). Not spinning. Very little air getting to the turbine. Apparently something wrong with the valve. I pushed it in and it isn't coming back. (Is there a spring on those things or is it just air pressure that pushes it back?)
So I decided to try and take the valve out. Unfortunately, it's made of brass, is recessed, and has a very thin nut flange. Which of course promptly stripped out. Already soaked the inside with PB blaster to no avail. So,
- any clever way of taking this out besides/in addition to PB blaster, heating, chiseling, grinding the recess, etc?
- Are these valves universal and interchangeable in case I have to destroy it since it seems unlikely I'd be able to / would be worth getting an OEM part for it?
- Can one readily make a substitute valve of sorts with a bolt or something in general? I suppose I could just plug the hole and put a valve at the air intake of course but that's not very elegant.

Yea, yea, I know, I can get one from HF for $20 or so. But never mind that.

Here is a pic.



Second, I got a Devilbiss 3/8" air ratchet. Plenty of air coming out of that one. But it isn't ratcheting. The lopsided affair at the end that IIRC is supposed to shift back and forth is not moving even when I try manually to push it around. Haven't taken that one apart yet, but are there typical problems that manifest themselves like that with obvious solutions?
Are Devilbiss decent tools?
IMG_0095.webp
 
Throw them in the round cylinder and buy something new or better quality.
 
I want to know the answers too. Subscribed...
 
well, it's done. fixed both of them.
interesting workings in there.
man, that sander sure sucks up air...
 
well, it's done. fixed both of them.
interesting workings in there.
man, that sander sure sucks up air...

Details?
 
Usually on those I figure out what size the nut is and then carefully grind a deep socket down to fit into the recess area. Behind is a screen that can become plugged. Inside the motor should be a rotor with slots and the vanes fit into the slots and come out when air is applied to seal the chamber.
 
Details?
Not too interesting, but on the sander, the rubber plug that is supposed to control the air flow with the valve had disintegrated and had plugged things up. I took the valve assembly off with a chisel / punch. Brute force. Removed the plastic remnants. Put it all back together. I no longer have the lever valve operating, but I can turn it on and off with the side control. Moot point anyway, cuz my little compressor can't keep up with it so I'll let it be for now, but I could fabricate something for a valve if I felt like it.

On the ratchet I don't know what was wrong. Took some of it apart, cleaned, lubed etc. Now it's working. Another one of those shop mysteries...
 
Details?
Not too interesting, but on the sander, the rubber plug that is supposed to control the air flow with the valve had disintegrated and had plugged things up. ...

The plastic "mushroom valves" often fail, most times a steel ball bearing will work for a replacement, usually 5/16" od.

the ratchet I don't know what was wrong. Took some of it apart, cleaned, lubed etc. Now it's working. Another one of those shop mysteries...

The most common air ratchet failure is the tension springs.
https://forum.ih8mud.com/workshop-home-improvement/231510-how-repair-air-tools.html
 
The plastic "mushroom valves" often fail, most times a steel ball bearing will work for a replacement, usually 5/16" od.



The most common air ratchet failure is the tension springs.
https://forum.ih8mud.com/workshop-home-improvement/231510-how-repair-air-tools.html



ah, a ball? very clever. Will look into this and see if that'll do for this one, well assuming I can find a ball of the right size, that is.

will check that up, thanks. Both of my 3/8" ratchet can be stopped by grabbing onto the socket. Although both are new. Will look into that too.
 

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