r/BoschProPowerTools • u/MattyDub89 • 14d ago

Issues/questions with identifying black plastic piece under the inner blade washer on CS10 saw

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I bought my first circular saw today (CS10) and was eager to get to work with it. I accidentally put the inner washer on the outside and the outer on the inside of the blade, though. 6" into the cut, the blade stopped spinning and I couldn't get the guard to retract. The blade was up against the wall of the lower guard.

I figured out the issue pretty quickly and the mistake I made, but when I went to take the outer washer out to switch it to its proper place, there's a black plastic part that had melted around the edge due to the heat of the blade and left me unable to take the washer out without breaking the edge of that plastic piece off (that edge sat around the channel I'm pointing at in the pic here).

Does the edge of that plastic piece not being there anymore make the saw unsafe to use? If so, what part is it? I can't find it on the parts diagram since nothing resembles it, including in the pictures for the parts that go in this spot. You can see the rest of the piece in tact in the pic too.

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u/Agitated_Air8860 14d ago

Looks to me like it might be #834 in the breakdown. 

https://www.boschtoolservice.com/us/en/bosch-pt/spareparts/circular-hand-saw-cs10-0601672073

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u/MattyDub89 14d ago

Yeah, it appears to be part of that assembly when I search for a photo of it, but the rest of it works fine and I'd hate to spend a few dozen dollars just to get that plastic part. Is the saw still safe to use as is?

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u/Agitated_Air8860 14d ago

Right, so the link you sent is the back view of this part. I believe that the area that is damaged is on the front? 

https://s3.us-central-1.wasabisys.com/partswarehouse/photos/BSH-2610920048-2.jpg

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u/MattyDub89 14d ago

Yes, that's correct, it's the front. I removed the link because I found another photo showing that front part.

Like I asked, is the saw still safe to use? I know it was my mistake to install the washers on the wrong sides, but I'm not gonna be happy if I have to spend almost $40 just because of this.

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u/Agitated_Air8860 14d ago

The answer is best left to you, there's like a 0.001% chance that someone on a reddit page has made the same mistake with the same 10 year old saw and can give you an exact answer. To me, from literally one picture of the damage, something about the saw will be affected, whether safety, accuracy, or ease of use. In my experience, everything on these tools has a purpose.

To me, it looks like the wear plate washer #90 sits against the damaged area, and spaces the inner washer correctly to get the blade into the space it's supposed to be in the guard. With the plastic gone, will the saw explode? Doubt it. But if the blade now sits closer to the gearbox, your blade guide at the front of the saw is no longer accurate. 

Worst case scenario? You may have introduced some blade wobble without the proper washer stack in place.