Yes, OEM Stihl .325/7. Saw is MS260.are those all pics of same sprocket?
That's what I thought until I installed a brand new Oregon 22BPX chain. This particular combo of sprocket and chain causes VERY significant chain tensioning issues. Chain is tight some times and loose other times as the sprocket rotates. Drum and bearing are new OEM. A new sprocket fixed the issue. Only thing I can figure is that the tie strap width is different between the Oregon and what was previously run (unknown) and sometimes the new tie straps are falling into the grooves on the worn sprocket (loose) and sometimes not (tight).Some ive seen have an wear indicator, a little slot that cut in where the chain rides. when that slot disappears its time for a new sprocket. id say theres more life in that one still
are those all pics of same sprocket? some ive seen have an wear indicator, a little slot that cut in where the chain rides. when that slot disappears its time for a new sprocket. id say theres more life in that one still
The worn chain fit nicely in the worn rim sprocket. The new chain did not fit the rim so nicelyI looked at the referenced Oregon manual and it mentioned 1/64" = .0156 which is what Ray quoted.
At first I though that the tie straps might be a different width between Stihl and Oregon but Stihl is only about .004" wider than the new Oregon. The real difference is that the bottom of the Stihl tie straps is flat whereas the Oregon is indented (concave).
The worn chain fit nicely in the worn rim sprocket. The new chain did not fit the rim so nicely
I'll never forget the Stihl 460 that came into my shop three years ago. The rim sprocket was chopped in half by the chain's drive links. Not only that, the operator kept tightening the chain even more. That cut the spline almost in half and the needle bearing was shot as well. He said, "I had to get the job done, and I guess I pushed it a little too hard. I stopped when the smoke got too thick to see what I was cutting. Things seemed rather hot."
Just barely. That was next on the agenda as the chain continued to grind away. I explained that to him.Crank was O.K.?
~$5 for the rim, $25-30 for a drum, so not the end of the worldA new rim is cheap a new rim and drum assembly isn’t.
When in doubt, change it out. Takes 5 min and leaves no question.I'll let the photos speak for themselves. How does one know when a rim sprocket is done and should be replaced?
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