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Most likely the throttle valve is stuck open. On sanders usually sanding debris has coated the throttle valve pin, causing it to stick. Other times the throttle valve seal has worn and needs replacement.
I work in a wood working shop and we use orbitals on everything. You still will still sand with nice even strokes with the grain. It leaves a great finish. They are nice, light, and easy to use! They do use a lot of air though, so make sure your air compressor can handle the one you buy. If you compressor is constantly running you might have to take breaks so you do not burn it up. enjoy!
check the exhaust muffler. or just take it off and see what happens.
there is usually an inlet air adjustment on the palm sander itself one of these will correct your sander.
if not, and your air supply is good. put some air oil in it or even a light weight oil will work.
if none of this is the correct action to get it going. its probably toast!
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
Normally when the air will not drive the tool, it is because 1- the tool is rusted up inside, 2- there is no lubrication of the moving parts - which can be remedied by putting something like WD40 in the inlet with the air switch open, 3- the drive parts are broken or worn out, 4- not enough air volume/pressure to run the sander.
You probably need to spray some lube as above & see if that will get it to work. Also turn the sander part by hand. Rick
# Ensure that sanding belts are not too tight or too loose. Never operate a sanding disk if the paper is loose.
# Use the correct grade of abrasive material for the job.
# Ensure that the distance between a circular sander and the edge of the table is not greater than 1/4 inch.
# Do not push materials against sanders with excessive force.
# Sand only on the downstroke side of a disk sander.
# Do not hold small pieces by hand. Use a jig for pieces that are difficult to hold securely