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post #1 of 25 Unread 07-22-2019, 12:25 AM Thread Starter
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Chahinsaw chain keeps coming loose

I have a Husqvarna 272xp saw. The thing fires up and runs like a top, but the chain keeps coming loose after only a few cuts. Its good and sharp, getting plenty of oil, and as far as i can tell the bar isnt worn. The studs aren't stripped that hold the bar on and i replaced the tensioner thinking that may be the problem. I have also tried a different chain. Any thoughts? It has a 24” bar with an oregan chain 3/8” .050 84dl. Could it be the clutch? Bar? Any possibility the cover/chain brake is worn out not pinching the bar correctly?

I really don't think its me I've put plenty of bars on saws and don’t have this problem with my stihl 041, my little poulan, my ol’ home lite 360 ect

Any thoughts would be appreciated.
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post #2 of 25 Unread 07-22-2019, 05:19 AM
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Re: Chahinsaw chain keeps coming loose

Tighten it up and scribe a line on the bar against a non-moving part on the saw, least ways by doing that you can either confirm or refute the bar it's self moving...............Mike

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post #3 of 25 Unread 07-22-2019, 08:14 AM
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Re: Chahinsaw chain keeps coming loose

Are the bar nuts knurled? There should be visible slashes that act as lock nuts against the bar. Probably something similar on the back side, under the bar. If not, maybe try lock washers?

That's if you're positive the bar guides aren't worn. Bars aren't exactly cheap, but maybe consider replacing it as a test.

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post #4 of 25 Unread 07-22-2019, 10:16 AM
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Re: Chahinsaw chain keeps coming loose

Sounds like you are just loosening the nuts and moving the bar. You need to loosen the nuts on the bar until it is loose, then adjust the screw that tightens the chain by moving the bar, then tighten the nuts to secure the bar.

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post #5 of 25 Unread 07-22-2019, 10:40 AM
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Re: Chahinsaw chain keeps coming loose

Quote:
Originally Posted by RT3360 View Post
Sounds like you are just loosening the nuts and moving the bar. You need to loosen the nuts on the bar until it is loose, then adjust the screw that tightens the chain by moving the bar, then tighten the nuts to secure the bar.
OP says:

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Originally Posted by Bigskyguy View Post
i replaced the tensioner thinking that may be the problem.

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post #6 of 25 Unread 07-22-2019, 10:51 AM
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Re: Chahinsaw chain keeps coming loose

Check the sprocket teeth, bar rail as mentioned, the roller for being pinched if it's a roller nose bar and make sure the bar itself has not bent. If the sprocket teeth are grooved from wear it will bind the chain causing it to jump off. If you put on a new chain and don't replace the sprocket make sure the sprocket is not deeply grooved from the old chain because it will ruin a new chain as it will set it's own wear pattern. Also use a premium bar/chain oil; I use Stihl because it is so tacky and does not sling off the bar tip as easily as others especially like the cheap stuff. Good luck.
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post #7 of 25 Unread 07-22-2019, 11:48 AM
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Re: Chahinsaw chain keeps coming loose

Any chain will stretch as it gets hot, don't try adjusting it right away or it will be too tight when it cools off.
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post #8 of 25 Unread 07-22-2019, 05:54 PM
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Re: Chahinsaw chain keeps coming loose

I'd say it's time to take it to a service center and have them look it over. Chances are another pair of trained eyes will spot the problem immediately.
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post #9 of 25 Unread 07-22-2019, 06:04 PM
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Re: Chahinsaw chain keeps coming loose

I had the same issue with my Stihl. I noticed it just kept getting looser and looser this year. It’s a fairly new chain. I finally ran out of adjustment. Don’t know why. I ended up just having a link taken out of it.

The service center showed me a trick when tensioning it, but I don’t know if it applies on all saws - keep the bar angled upward when tightening the chain, so it won’t have the tendency to loosen right back up. I haven’t tried it yet.
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post #10 of 25 Unread 07-22-2019, 06:17 PM
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Re: Chahinsaw chain keeps coming loose

Thats a definite on the bar whilst adjusting.
If you have trouble holding it up and tightening at same time,
use a block of 2x4 to help.
Also adjust the tension screw in the same manner.
If the bar drops while adjusting it will never set right.
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post #11 of 25 Unread 07-22-2019, 06:41 PM
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Re: Chahinsaw chain keeps coming loose

Quote:
Originally Posted by steddy View Post
I had the same issue with my Stihl. I noticed it just kept getting looser and looser this year. It’s a fairly new chain. I finally ran out of adjustment. Don’t know why. I ended up just having a link taken out of it.

The service center showed me a trick when tensioning it, but I don’t know if it applies on all saws - keep the bar angled upward when tightening the chain, so it won’t have the tendency to loosen right back up. I haven’t tried it yet.


I've always done that on every saw I've owned... I have a wood block on my bench just for this purpose.

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post #12 of 25 Unread 07-22-2019, 06:49 PM
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Re: Chahinsaw chain keeps coming loose

Sounds like you are doing everything right.
You may need to get new jamb nuts for it.
That serration on the backside of the nuts helps hold in place.
I would not try the lock washer idea as it can damage the bar.
Some of the smaller,18" bar, Stihl have only one nut and they hold.
Also, and you probably do this.
Make sure the bar and saw mating surfaces are clean before assembly.
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post #13 of 25 Unread 07-22-2019, 11:25 PM Thread Starter
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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 titghen 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.
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post #14 of 25 Unread 07-22-2019, 11:30 PM
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Not sure if anyone has asked this question...but for how long has this bar been in use? What kind of jobs has it done?
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post #15 of 25 Unread 07-23-2019, 12:14 AM Thread Starter
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This saw was made from 99-01 or so. It was my grandfathers, but not sure if he bought it new. He cut about 8 cords of firewood a year with it (we have pine up here) but it hasnt seen much use in the past 10 years.
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