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I have a question on a simple repair on a Hitachi circular saw. The spring that returns the blade guard is broken. I have a replacement spring, but the exploded view of where to connect the spring doesn't make sense to me. Any suggestions? Thanks Dale
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Usually you will have to remove the blade guard to get access to that. There is usually a rubber stop with a screw going through it that you will have to remove, and a spiral spring clip on the inside of the hub of the blade guard that will also have to be removed and then you should be able to lift the blade guard off the saw. The spring will hook around the blade guard and the other end will hook to the saw housing. Hope this helps!
Other than carbon brush springs, the only other spring that I know of on a circular saw is for the blade guard so that it will automatically return to cover the blade after you make the cut. There should be a hook or a bend in each end of the spring and each end has a certain spot where it hooks so that it pulls the blade guard back in place.
Simple, unpug tool. Remove blade and back flange. Remove circlip and lift off guard. Unclip spring. Re-fit new guard. Refit spring and circlip. Refit blade.
Remove the clip behind the back blade flange holding it on to the housing and lift it up of the return spring, replace the opposite way remembering to relocate the return spring. Make sure you get the model number correct as the 390 and 390k are different.
As you are looking at the blade side of the saw, the spring hooks through a hole at about three o'clock on the lower guard. It then wraps around the bottom of the guard clockwise and attaches to the upper guard. The hole on the upperguard should be somewhere around ten to twelve o'clock. Move the lower guard to check for binding and full return to the safe position.
I am assuming that you have some type circular saw?
Most popular saws use a spring to return the guard,with the saw unplugged raise the guard and see if the spring is there(you may need to take off the blade) if it is not there,replace with proper spring.one end of the spring will hook onto the fixed 1/2 of the guard the other to the front of the moving guard(consult manual if possible).once this is done insure that the guard mover freely and is not in the way of the blade.Replace the blade in proper direction check guard again for proper travel,make sure everything has been re-tightened .
If the spring is there check for material build-up or debris that is causing
guard not to move,remove blade clean debris or obstruction,replace blade and check for proper operation.Also visually inspect where the moving guard is attached to the saw for any unusual marks or wear this could be a sign that some type of unsafe situation exists,if this happens refer to a pro to fix or buy new never use a saw without a properly working guard,it took 141 stitches to repair my friends leg.
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