Air Sander Question

Question edited for clarity.
Question moved to correct category.

Not many spares are listed

https://www.google.com/search?q=WEN+7%22+2+SPEED+SANDER+MODEL+943+parts

Try the maker direct.

Parts - WEN Products

https://wenproducts.com > collections > parts
8.5-inch Sanding Pad for WEN 6369 Part Number: 6369-003 Compatible with the following Model: WEN 6369 Variable Speed 5-Amp Drywall Sander .

Part 15


https://www.toolpartsdirect.com/ingersollrand-311a-heavy-duty-air-dual-action-quiet-sander-6-pad.html

http://www.toolpartsdirect.com/cgi-bin/schematic.cgi/makita/BO5001

They have all parts.

Checked the net for answers and got a couple of maybe's. 1.) Brushes, 2.) variable speed control, which some were direct wiring.
I tried the brushes firs and that has solved the problem for now. I guess the brushes stuck or somehow lost contact.
I got a parts diagram and found the brushes (will be covered with dust). Took the springs out and stretched them a little, replaced and the sander turned on. You will need to remove the top cover to do this. Verdit is still out as to long term performance. Not a great start.

My particular sander was lightly used (second project) and it has not been abused.

Never start the Sander without first placing it against the surface to be sanded. In free air the Sander will not osolate.

get some air tool oil and oil it lol, if that will not speed it back up you may have to take it apart and clean it but the oil should do the trick. Do NOT use wd40, etc. use air tool oil

There can be a few problems. First is your air supply the right pressure and volume for the sander. Check that at the quick connector to the sander itself. Second, if it is cold and moisture is high, ice can get into the sander which will slow it way down. Third, and probably most likely cause, is the sander well oiled and the parts inside clean. Fourth, mechanical issues: the drive motor may be well worn out inside, the bearing that the main shaft for the sander may be worn out & so forth. Hope this helps you, Rick

hi a major problem with pneumatic tools is that nobody ever seems to oil them! try droping tool oil or a light machine oil down the air inlet and leave over night and then run the tool on full ,if this doesnt work then strip the tool and clean and make sure that the blade sealing surfaces are good
hope this helps ian

Here's a link to the online manual.
As far as that diagram....didn't you label the wires?
Take a look here, it may help you. circuit wiring , especially the paragraph that begins: "Knowing that electrically common points have zero voltage drop between them is a valuable troubleshooting principle." Also read about resistors. That speed control knob is one.
Hope that helps...

I hope this information allows you to resolve this issue. If you need further assistance, please post back with a comment to this thread. If I've managed to answer your question or solve a problem, please take a moment to kindly rate this post....thanks!

When you are finishing the surface of wood, it's vital to maintain control. Work too fast or too slow and you risk ruining your hard work with unsightly scratches