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My chain keeps coming loose on my 455 rancher and i have no adjustment left in the tightening screw

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Check that you havn't chewed the tightening screw up. If the locking nuts were on too tight then the chain cant be pulled tight. It may also be the wrong chain or you have stretched it slightly.

Posted on Apr 22, 2017

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1 Answer

Chain tension loosens during use


That is normal after using it. You have to loosen the lug nuts at the bar cover and with the screwdriver end of the tool tighten the screw near the back end of the bar. It is the chain adjustment screw. When tightening it, pull up on the chain with your other gloved hand. Don't over tighten it and tighten the nuts down so the chain will be snug but not too tight.
When sharpening your chain , do not file down the drag links too much. (They do cut better with the drag links filed down just a bit.) But that will also make your chain loosen up more quickly.

Nov 27, 2013 | Husqvarna 455 Rancher Chainsaw - 20" Bar

1 Answer

I have a new 455 rancher chainsaw husky 20inch bar chain keeps coming off new chain


You may have a bent bar, or you could be putting the chain on a little too loose. Perhaps the chain is not getting lube ?
Possible that the chain tentssioner and or adjustment is loosening up as you are using the unit. Other than that maybe a defective new blade ?

Oct 21, 2013 | Husqvarna , No.455 Rancher, 20" Gas -...

1 Answer

Husqvarna 455 rancher, chain getting too loose to tighten after one days use age. Bar oil topped off with every fill up of gas. Bar cleaned in the groove, etc. New chain. The bar will no longer adjust to...


indicates incorrect length chain in use
the adjustment slots should be about 1/3 when fitted moving close to 1/2 when adjusted
the correct adjustment is when the chain in the center of the bar is lifted up the bottom segments of the chain are still in the bar groove
make sure that the oiler hole is not blocked from saw dust and chips

Aug 08, 2017 | Husqvarna , No.455 Rancher, 20" Gas -...

1 Answer

Chain tensioner screw keeps breaking on husqvarna 455 rancher


The tensioner should only move the bar when the retaining nut/nuts are loosened, once the nut/nuts are tightened there should be no pressure on the tensioner, so the nut/nuts are not tight enough.

Mar 01, 2013 | Husqvarna Chain Saw 20" Bar

1 Answer

Loose chain


if you have atleast 1/8" of teeth still on chain .take a link or 2 off good to go saved you beer money.

Feb 18, 2012 | Husqvarna , No.455 Rancher, 20" Gas -...

1 Answer

I have a rancher 455 and it's not suppling enough oil to the bar. Is there an adjustment for this?


The 455 has a 3 position adjustable oil pump, the adjuster screw is up under the crankcase, sprocket side, you need a flat blade screw driver.

Oct 11, 2011 | Husqvarna 455 Rancher 555cc 35 hp 20"...

1 Answer

Loosen or tighten chain on a 445 Husqurna Rancher chain saw


If this is the tooless system, flip open the wing on the bar cover securing nut, slacken off one turn, now use the knurled wheel in the cove to slacken, or tighten the chain, if it has two 13mm bar nuts, slacken them off one turn each, then use a flat blade screw driver through the side cover, betwwen the bar nuts to adjust the chain, the screw is quite small so clean away the saw dust to locate it.

Oct 02, 2011 | Husqvarna , No.455 Rancher, 20" Gas -...

1 Answer

New Rancher 455. Ran for a few minutes then tried to tighten chain but adjuster was maxed out (completely tight clockwise). Removed cover, now can't get tension adjusting pin in hole in bar....pin sits...


Ok.. with the cover off the clutch you notice the screw and the pin that is suppose to go into the hole.. with the chain on the bar back the screw until the pin sits in the hole of the bar.. The chain should be lose you will see the chain dangle at the bottom of the bar.. put the cover back on with it lose.. hand tighten the two nuts that hold the cover on. with the bar in hand and you pulling the bar up make sure the two nuts are on tight enough so the bar does not move but dont over tighten it. tighten the screw you will notice the chain starting to move, and start to tighten up.. once the chain is in the grove of the bar grab the chain and move the chain with your hand to make sure you have not over tighten it. if the chain moves freely and is not lose ( you can also double check how tight it is by grabbing the chain below the bar and letting it go if it snaps back into the bar and doesnt hang there you are where you need to be.) tighten the two nuts up on the cover and start up the saw. Run the saw to make sure everything is all set and nothing is lose before cutting.. If the chain never get to tighten up you need a new chain. buy a new chain and follow the steps again. let me know if you have any questions

Jun 19, 2011 | Husqvarna , No.455 Rancher, 20" Gas -...

1 Answer

Too little chain adjustment. A new chain can be tighten but adjustment screw is already at the end of its slot. During the first use of the new chain, the chain will stretch. Then, the adjustment screw...


It must be the wrong chain, stamped into the bar will be all the information you need, it will give you the drive link count, this will always be an even number, 56/64/68/72 are the most common chains

Jun 10, 2011 | Husqvarna , No.455 Rancher, 20" Gas -...

1 Answer

How do you rePlace the chain on the 455 rancher?


You take the chain cover off of the bar. It is two nuts. Take them off and the cover will come off. Slide the bar toward you and the chain will become slack. You can then slide off the chain from the sprocket. To put a new one on. You will need to turn the chain adjustment back all the way to the left. Then put the chain back over the sprocket, then onto the bar. Put the chain cover back on and tighten the chain back up. Then tighten the two nuts back to tight.

Apr 03, 2011 | Husqvarna , No.455 Rancher, 20" Gas -...

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