Nothing is as easy as it is supposed to be.
I have a Husqvarna 440 chainsaw that I have had for a few years. The thing really works like a champ. The one thing I won’t tolerate in a 2 cycle engine is difficulty starting and I don’t have that problem with this. Even the first start of the season is effortless.
I decided that the weather was nice enough to take a break from drywall and cut down a tree that pissed me off. (Sometimes you have to remind the other trees who is boss). I was doing a fine job of cutting when the sawblade got pinched. Once I freed it up, the chain wouldn’t move. I have pinched the end of the bar and froze up the little wheel in there.
No problem. I went to the local saw bar merchant and bought a replacement 16″ blade and chain set from an off-brand, Oregon. This is a easy swap out that I have done before with no trouble.
Not this time.
The Oregon bar and chain set do not fit my saw. The chain is smaller by at least an inch and that prevents the adjusting lug from engaging on the bar.
You can see, even when it is all the way loose, it is still just a bit off.
So I tried using the old chain on the new bar. Still no joy. If you look really carefully at the round holes where the adjusting lug would engage, the brand name bar has slightly larger holes than the Oregon bar. The difference in the long center hole didn’t matter because the ends of that hole never come into contact with the aligning bolts.
To fix this, I went back to the drawing board and pried on the pinched end of my original bar to pry it open a little and free the sprocket on the end. This worked. I put it back together with the original parts and was back in business.
Adendum: for the benefit of those wondering what a “pinched end” is. It is the tip of the blade, furthest from the motor, or “the end”. “Pinched” is an unnatural condition. Normally it is not pinched. Pinching or compressing seizes the small sprocket sandwiched in the end and prevents the chain from moving.