Question about Husqvarna "Chain Saw - 16" Bar, 3 Hp

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I have the Hq 435. The bar nut will excessively loosen during every cut to the point that I have to tighten it each after each cut. I am afraid that during a cut it will just come off altogether. This started only after I took it apart to clean out some debris wedged between the chain and the back cover. Any thoughts?

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If this is the tooless brake cover, with the big plastic hand nut, i never liked this system, we always fitted the standar brake with a 13mm nut that could be tightened with the combination spanner, the brake is part no. 501388201.

Posted on May 18, 2011

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  • lovassyshop May 18, 2011

    No. It requires the combination spanner to tighten, which I am using. I am just afraid of tightening it too much, but the manual just says to tighten it. I am tightening it until the point where I can just freely pull the chain around.

    Is there a possible washer or something that I didn't notice fall out?

  • Andrew White May 18, 2011

    No there is no washer, just a flanged 13mm nut, i do no understand what you mean by tightening so as you can freely pull the chain, the tightening of the nut has nothing to do with the chain tention, you should set the tention with the adjuster screw, then tighten the nut good and tight, i think you are not tightening it enought, it should not tight the chain no matter how tight you do it.
    Regards Andrew

  • lovassyshop May 18, 2011

    Sorry, I didn't mean the chain tension or chain itself; I meant the ability to actually pull the chain around the bar by hand (maybe that is still the wrong way to say it). Tightening the nut seemed to affect how easy it was to pull the chain around the bar. I was concerned about overtightening the nut, but if it isn't possible to over-tighten it, then I am just likely not tightening it enough.



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2 Answers

Tightening chain

Tightening chain is performed by adjusting the bar. Two bolts generally hold the bar in place. Loosen these. Make sure that chain has enough play to easily move by hand. If it sticks, it's too tight. Then tighten the bar, check the chain oil, and cut wood.

Mar 25, 2015 | Garden

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Change chain

Loosen and remove bar lock nuts and cover. screw tensioning screw to loosest point. wrap chain onto teeth of drive sprocket, then within grooves on bar. Be certain cutting edges are facing forward. Look at chain before removing. set bar with new chain to ensure the tension pin aligns with bar tensioning hole. Replace cover set nuts loosely. Tighten chain to about 1/4" out of groove when pulled on (wear gloves). Tighten nuts, spin chain to see it moves freely but does not hang free og bar groove. re-tension as necessary. Happy cutting!

Jan 04, 2015 | McCulloch Oregon 14" Chain for Mac Cat 351...

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Chain is off the bar of my husqvarna 435 chainsaw

If the chain gets too loose it can come off the bar, you need to loosen the two hex nuts that clamp the bar in position then with a flat blade screwdriver turn the tension screw anticlockwise, the screw is in the middle of the slot in the bar between the two clamp nuts. You will need to wind it back a fair way to allow the chain to be put back into its guide slot on the bar, then just nip up the clamp nuts gently to stop the bar flopping about and tension the chain by turning the slotted adjuster screw clockwise until the chain is just right... you should be able to just spin the chain without too much friction and if you lift a link in the middle of the bar with your fingers it should just half lift out of the guide slot. The chain will loosen a little more as the chain heats up during use. Don't forget to fully tighten up the clamp nuts when finished. Always check that the chain is not getting too loose and take up the slack from time to time. Happy sawing !

Nov 30, 2013 | Husqvarna Chain Saw 20" Bar

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

Tryed to put on a chain cant get it back togather right

Completely loosen the chain tensioner. When looking at the saw from the sprocket side(bar to the right) the chain WILL travel clockwise. Fit the chain on the bar.(ensure that the chain travels in collation with the sprocket at the end of the bar if equipped). When looking at the saw from the sprocket side(bar to the right) the chain WILL travel clockwise. With the chain still in the bar, fit the 5 or so links in the sprocket on the powerhead, engage the bar with the bar nuts, then lastly engage the chain in the tensioner. Place the sprocket cover and nuts. Tighten nuts then loosen about .5 turn. Adjust chain tensioner. Retighten nuts. See that tightening the nuts made your chain tighter, loosen nuts readjust chain, tighten nuts. With gloves on and the chain brake disengaged please ensure the chain travels around the bar. Put on your chaps and start cutting.

Sep 11, 2011 | Husqvarna , No.455 Rancher, 20" Gas -...

1 Answer

Hasqvarna 435 16"- bar nut loosens excessively

Put a lock washer on it to stop it from backing off.

May 18, 2011 | Husqvarna Garden

1 Answer


Are you holding the nose of the bar up as you tighten the bar nuts?
You loosen the bar nuts and gravity pulls the bar down. You check the chain and the tension is correct, tighten bar nuts. Begin a cut and the bar slowly moves upward (no matter how tight the bar nuts) and the chain becomes slack.
19d6408.gif Chain adjustment
  1. Make sure the chain brake is off (gloves will protest your fingers).
  2. If necessary, loosen the bar nuts that are clamping the clutch cover in place (or whatever holds the clutch cover and bar on). They don't need these really loose - finger tight will do.
  3. Ease the tension adjustment until the chain is obviously loose.
  4. Using one hand, hold the nose of the bar up.
  5. While holding the nose up, adjust the tensioner so that the center of the chain just touches the underside of the bar, add a touch more.
  6. Continue holding the nose of the bar up & tighten up the bar nuts / bolts / quick-release system.
One more likely possibility, is the chain isn't being oiled.
Checking chain lubrication
Aim the tip of the bar at a light colored surface about 20
cm (8 inches) away. After 1 minute running at 3/4 throttle
you should see a distinct line of oil on the light surface. HTH

Oct 20, 2009 | Poulan Pro 42CC 2 Cycle Chainsaw, 18"

1 Answer

Chain tightens up under power to point engine stalls

If you've already tried to tighten the bar tensioning nuts and the bar keeps "creeping" and gets tighter, that is unusual, as most times the bar should get looser, not tighter.

I would suggest you try a new bar and set of tension nuts, or at the very least a new set of tension nuts first.

The problem might be the tip sprocket has worn out (it needs to be lubed every time you add bar & chain oil to the reservoir in the chainsaw). If the tip sprocket is worn badly, you should replace the bar and inspect the cutting chain for excessive wear on drive side of the chain.

Remember that the slightest bit of dirt can cause rapid wear of the bar and chain and quickly ruin it beyond repair.

I hope you find this helpful and best regards!

Aug 06, 2009 | Garden

2 Answers

Chain came off

remove side cover of chain, loosen bar nut, there is a screw on the front of the saw under the sawdust and oil. Turning it one way tightens the bar. The other way loosens it. Loosen it til you get the chain back on, then tighten it til there is about 1/2" slack in the bottom of the chain between it and the bar. By the By, semi tighten the nut before any major adjustments, then adjust the chain to above and tighten bar nut. You should be set to go. BE CAREFUL! Dont forget personal safety!!!

May 10, 2009 | McCulloch Garden

1 Answer

Remington ld4016 w

There are one or two large nuts on the chain side. There is also a screw adjustment on the front where the bar or chain guide meets the saw. You loosen the nuts a bit (so that you can move the bar). Then you back the screw out to allow the bar to move back into the saw enough for you to put the chain back on the bar in the guide slot. Then you tighten that screw to the point that you can still push the chain around the bar (wear gloves) and there is very little slack under neath. Then you tighten the nuts. As you tighten them, pull up on the "nose" of the bar.

Make sure you keep oil in the reservoir and oil a lot as you cut. Keep the chain adjusted, they stretch as you use them. RTFM

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