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Lock the spindle (small chrome button near the tool's nose or lever at the power switch). You'll probably need to rotate the spindle by hand as much as one full turn as you do this, to get the lock to drop into place.
With the spindle locked, use your supplied wrench to turn the collet nut counter-clockwise (as seen from the cutter end) about one full turn. The collet should now be plenty loose enough to release the cutter / wheel / drill.
Take and plug in a variable speed drill now when your generator is powered up slowly hit the trigger on the drill start it at low speeds run it for 30 seconds then give it half speed for 30 then full speed fo 30 seconds then try your chop saw
Sounds as though you are on the right track. I would take it apart, and see if the trigger could have some dirt or other material causing it to stick, or is it worn to the point that it needs to be replaced. Good luck!
The SF4000a Is a cordless Drywall Gun. Even thought it has variable speeds most people run it full speed and then press and engage the chuck to run the screws in. The variable speed is used more to back out screws in reverse
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