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post #16 of 25 Old 07-23-2019, 06:08 AM
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Re: Chahinsaw chain keeps coming loose

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Originally Posted by Bigskyguy View Post
I tried marking the bar as mentioned. After cutting with it the chain loosened up, but the bar did not move. I forgot to mention it will also tighten itself back up after you shut the saw off and set it down. I lift the bar up when tightening the chain.
The bar doesnt look bent. It lays flat on a level surface and will even stand on both edges nicely.
The nuts that are on the saw do not have those groves and neather do the nuts on my poulan. (I know what you guys are talking about though)
The sproket that is on it is husqvarna p/n 501831601 which is discontinued. I think the replacment is 503650901.
I guess that may be my next step.
Loosening and tightening back up means the chain is getting hot, metals expand when getting hotter. You may have a lube issue. If there isn’t enough lube, the chain will get hot.
  • Does it look like it’s getting enough oil? What oil do you use?
  • What are you cutting? Hardwood makes the chain hotter.
  • How long has it been since you sharpened the chain? Did you file the rakes too?
  • Have you tried a new chain?

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Last edited by RT3360; 07-23-2019 at 06:14 AM.
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post #17 of 25 Old 07-23-2019, 08:53 AM
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I have a 18 inch, stihl ms250 and have done some pretty tough jobs with it. I've already went through 2 bars and one sprocket. Usually when I'd start getting symptoms like yours, I would replace the bar and it would fix it. If you decide to replace that sprocket, i would consider replacing the bar along with the chain as well. Oregon makes some very good bars(from my experience better than stihl).

Like RT said, make sure oil is getting from the saw, to the bar, and on the chain. Take of the bar and run the saw and see if oil will come out. Use compressed air to clean out the oil channels in the saw and bar and blow out the chain channel on the bar.

Hope you get it fixed!

Last edited by Andrew2; 07-23-2019 at 09:00 AM.
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post #18 of 25 Old 07-23-2019, 12:05 PM
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Re: Chahinsaw chain keeps coming loose

Heat from friction could make the chain lengthen and get looser. I would follow the above suggestions and add that I would want to be sure the oiler is working properly.
If you use the wrong lube, it may be being 'flung' from the chain too readily when the chain is moving. Alternatively, it may not be flowing as well as it should, starving the chain for lubrication, causing it to run hot.
I cut through an oak... with a small McCullough that was a brothers and had seen use. Sharpened the chain so often, but NEVER had it get hot to the touch. I have no idea why, but I surely don't remember it being hot.
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Last edited by tomw0; 07-23-2019 at 12:30 PM.
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post #19 of 25 Old 07-23-2019, 12:47 PM
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Re: Chahinsaw chain keeps coming loose

Oil (or lack thereof) could be the issue i’m having as well. Admittedly I’ve Used filtered drain oil for bar oil for years, but only recently started having this issue. I did get suspicious a couple months ago, and washed out the oil tank real good with gas, thinking maybe the filter was clogged, but noted no difference afterwards. Wonder if I should put an older chain on there and see if it repeats. Still seems to be using the normal amount of oil (pretty much matching tank for tank with the gas).
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post #20 of 25 Old 07-25-2019, 10:24 AM
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Re: Chahinsaw chain keeps coming loose

Use a piece of cardboard to test if your saw is flinging oil. Start the saw and and hold the tip about 4-6" from the card board and throttle up. If you see a lot of oil landing on the cardboard youre getting oiled fine. Just some times when youre using it hold it about a quarter throttle for several seconds just to ensure the entire bar and bearings are oiled.

Also scrape the bar grooves away from the sproket and make sure your sproket bearing is greased. Look for a pin hole next to the axel.

The best way to check bar straightness is to look down a groove holding it right under your eye. Ive had pool ques that rolled straight but when you look sown them theyre twisted every which way.
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post #21 of 25 Old 07-25-2019, 03:52 PM
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Re: Chahinsaw chain keeps coming loose

Is this a spur or rim sprocket? On a spur that's worn with valleys cut in.....You can tighten the chain on a ridge, then the drivers find the valley = instant looseness.

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post #22 of 25 Old 07-25-2019, 05:07 PM
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Re: Chahinsaw chain keeps coming loose

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Originally Posted by dougand3 View Post
Is this a spur or rim sprocket? On a spur that's worn with valleys cut in.....You can tighten the chain on a ridge, then the drivers find the valley = instant looseness.
OP said it tightens up if he lets it set a bit after running. Someone said they use drain oil, but regular bar oil is a lot stickier and will lube a bar better, especially when it gets hotter. Some things you can do cheaper, but IMHO bar oil isn’t one of them.

Back to an earlier question I asked, have you tried a new chain? That should rule out the chain sharpness.

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Sold Husqvarna 2010 GTH27V52LS w/52" fab deck
Craftsman DLT2000, 48”
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post #23 of 25 Old 07-28-2019, 07:15 PM
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Definitely one that i agree on. Went through that experience myself. Ruined quite a few chains befor figured it out. Just don't do it. Using bar and chain oil is cheper in the end.
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post #24 of 25 Old 07-28-2019, 08:33 PM
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Definitely one that i agree on. Went through that experience myself. Ruined quite a few chains befor figured it out. Just don't do it. Using bar and chain oil is cheper in the end.
Over the last 10 years, I’ve saved more than enough by not buying bar oil to replace the bar and chain multiple times. I still haven’t worn out a bar (however I did upgrade to a 20” bar about 4 years back because it saved me from having to bend over as much), but have worn many chains due to repeated sharpening. I’ll stick with filtered drain oil until I have to replace at least one bar “prematurely.”

Update: I got lazy the other day and just swapped a sharp spare chain a couple years old with the newer dull chain I was having issues with loosening up. Ran through 3 tanks of gas without needing to tighten up the chain. I think it’s just a bad chain...
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post #25 of 25 Old 07-28-2019, 10:01 PM
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Quote:
Originally Posted by steddy View Post
Over the last 10 years, I’ve saved more than enough by not buying bar oil to replace the bar and chain multiple times. I still haven’t worn out a bar (however I did upgrade to a 20” bar about 4 years back because it saved me from having to bend over as much), but have worn many chains due to repeated sharpening. I’ll stick with filtered drain oil until I have to replace at least one bar “prematurely.”
Well I'm glad it worked for you! I've seen other people do it for years and never regret it, its just the way it turned out for me.
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