Sounds like the motor's burnt out but would be interested as to where you purchased it especially if the W in Wolf is with a broken W like \\/ as I believe these tools although cheap and are made in third world and not very well made as your description states.
I would be very interested as to where you purchase it.
I'm in UK and there is only one company that seems to sell Wolf tools with the broken W and there cheap.
Post using the answer to your own question form From whom you purchased the compressor if the logo Wolf has the broken W.
I had bought a weeder with this Wolf logo and it was imported. It lasted only 36 hours over a years gardening season.. gears were plastic and one was stripped of its teeth, no spares available no company either they went bust.
BB
March 2011