Backstage
ArboristSite Operative
How much is too much wear on a rim?
Rim Sprocket Wear?
- Thread starter Backstage
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I always replace with a new chain when doing dealer work and if no chain replacement, I measure to see if wear is more than .02 in or .5 mm. If more than that, then I replace.
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I'd say that sprocket is long past needing to be replaced.
My ms290 ran the last 5 years before I sold it with the same rim sprocket. It looked a hell of a lot better then what is in your picture. That looks like if the chain was loose it could skip in the sprocket.
My ms290 ran the last 5 years before I sold it with the same rim sprocket. It looked a hell of a lot better then what is in your picture. That looks like if the chain was loose it could skip in the sprocket.
This one needs to be replaced. I saw one that was sliced in half by the chain and the chain started to cut into the bearing. The only reason it showed up was because the owner could no longer tighten the chain and wasn't "getting any traction."
Backstage
ArboristSite Operative
That’s pretty extreme!
My gut was to replace this one, but the reason I’m asking is that it’s not immediately clear where the ok/replace line is, and I’d like to know.
My gut was to replace this one, but the reason I’m asking is that it’s not immediately clear where the ok/replace line is, and I’d like to know.
To each his own, but I typically run em til they break.
"To maintain the service life of your saw chain, STIHL recommends that you replace the sprocket on your chainsaw after you have gone through two chains or sooner if the sprocket shows more than 0.5 mm of wear. STIHL advises alternating between the two saw chains to help keep the sprocket from wearing out prematurely."
Another idea:
"Look closely at the teeth of the sprocket for signs of a groove or notches. The teeth are supposed to be smooth and consistent. If you noticed that there is a groove worn in the teeth and the chain will not rotate consistently smooth, it's time to replace the sprocket."
Another idea:
"Look closely at the teeth of the sprocket for signs of a groove or notches. The teeth are supposed to be smooth and consistent. If you noticed that there is a groove worn in the teeth and the chain will not rotate consistently smooth, it's time to replace the sprocket."
That's past too much wear.
Why not run them until they break in two. LOL
I believe the ok/replace line or wear indicator (small notch above and below) has been worn away for some time .
Let er rip tater chip , Not !!!
When those indicator lines disappear it's time to replace them.
The groove on the left (where your thumb is) still has some line visible but the one on the right is worn past the line.
I would replace.
The groove on the left (where your thumb is) still has some line visible but the one on the right is worn past the line.
I would replace.
Thats toast. Anytime the slots flare out, its time to replace that $8 rim. OR you can run it until it destroys the drum splines.......than theres the bar............
"...Then there's the bar..."
Truer words were never spoken, Captain. The last two sprockets I replaced (one rim and one tooth) had both succeeded in letting the chain(s) just about ruin the bar(s). I redressed both bars and shook my head while doing it. Both were in questionable condition.
Truer words were never spoken, Captain. The last two sprockets I replaced (one rim and one tooth) had both succeeded in letting the chain(s) just about ruin the bar(s). I redressed both bars and shook my head while doing it. Both were in questionable condition.
Bars are reasonable these days. Oregon is tops. ARCHER is out of Australia, and the USA distributor, Minor Karnes, and his Son, will work with anyone.
BranchManagr
ArboristSite Lurker
Just like the GBar should be flipped every once in a while,
so too the rim sprocket.
That way you don't only get longer life & even wear, but also get a chance to inspect the components for burrs, hairline cracks respectively.
thenne1713
ArboristSite Operative
Hold up next to a new sprocket; keep a new spare, and REPLACE W/ #4 CHAIN AFTER WEARING OUT 3X CHAINS, per Husky Manual?
The thing you don't want to happen is let it wear down until the drive teeth on the chain start contacting the crankshaft spline, up until then I wouldn't worry about it
Backstage
ArboristSite Operative
I’m always surprised how symmetrically these wear, even on the spur types that you obviously can’t flip. What’s the utility of flipping them?
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I would finish out the existing chains on that sprocket, and go with a new sprocket when you get new chains. Do not run the old chains on your new sprocket.
