Chain won't spin after tightening the nut
- Thread starter livemusic
- Start date
Help Support Arborist Forum:
livemusic
ArboristSite Operative
I can't find a burr in it but I will try again.
livemusic
ArboristSite Operative
juttree
ArboristSite Guru
It only takes a few of the drivers to have burrs and it will stop the chain from spinning freely. Do what westcoaster said and put the chain on loose and run it a couple of blips of the throttle then tighten it normal.
livemusic
ArboristSite Operative
I give up trying to upload a pic of the inside of the clutch cover. Error, time after time. I uploaded it early on in the thread, maybe you can double click on it and make it bigger?
Husqvarna H37 chain is 3/8 low profile ('mini'), .050 (1.3mm) gauge chain. This matches the markings on the bar. Can't see the sprocket.
http://www.husqvarna.com/us/accessories/chainsaw-chains/h37-3-8-mini-pitch-1-3-mm/576936545/
Several people have noted that this saw usually is equipped with .325 pitch chain. Looking at your photo in Post #51 above, it almost looks like the front of the bar adjustment slot is filed towards the front. It is not uncommon for people to swap out bars, chains, sprockets, etc. on a saw - usually not a problem if they match as a set.
Your comments about the lack of slack make me wonder if this set up was modified to fit? Still, that should not affect the chain binding issue, if it worked before, as you indicate.
This is part of what makes saws 'interesting' . . .
Philbert
Chris-PA
Where the Wild Things Are
As suggested upthread, mount up the bar without the clutch cover using washers or a larger nut as a spacer. Then you can see what is going on. It's not magic, just some simple mechanical interference.
No, it should just be between .650 to .750". 650 divided by 2 is .325 I'm talking about the rivets that hold the chain together.
livemusic
ArboristSite Operative
Huh? It IS between .650" and .750" -- as I said, it is about .71875". Divide that by two and you get .359375". Of course, that is just by guessing, eyeballing a ruler, I don't have a caliper. So, does 1/2 of .71875" (.359375") indicate that it is 3/8 (.375) and not a .325 chain?
The pic posted by Philbert above... the distance between the two dashed lines... on mine, that is what I am calling .71875".
I am going to run the saw just a little and try again as some have suggested.
- Joined
- Dec 6, 2014
- Messages
- 21,219
- Reaction score
- 25,109
The chain looks like a 3/8 lo/pro, the bar is, but is the sprocket? The 346 calls for a .325 rim setup. What is the history behind this saw?livemusic
ArboristSite Operative
Somebody got hold of a near mint 346xp (50cc version) that had done test cuts only and had it ported. Also installed Walbro HDA199 carb. Ran one tank of gas through it afterwards. I have run it maybe one hour.
I got a fancy ruler on it wearing a jeweler's rouge. I still get 23/32" between 3 rivets... .71875". That should be .75"? Does it seem odd that it is not .65" and not .75" but it is .71875"?
I don't know if I can take the clutch cover off, never done it, will try, but I don't like sticking a rope down into the cylinder, lol. I assume I have to remove the clutch to see the sprocket so I can determine sprocket size.
I got a fancy ruler on it wearing a jeweler's rouge. I still get 23/32" between 3 rivets... .71875". That should be .75"? Does it seem odd that it is not .65" and not .75" but it is .71875"?
I don't know if I can take the clutch cover off, never done it, will try, but I don't like sticking a rope down into the cylinder, lol. I assume I have to remove the clutch to see the sprocket so I can determine sprocket size.
livemusic
ArboristSite Operative
Yes.
I ran it a little bit with the chain somewhat loose and then tightened normally. Same problem upon tightening the nuts. I did this procedure twice.
This is probably wrong but here goes, you said the Husqvarna guy sharpened it on his grinder right? Are you positive he gave you back the right chain? I can picture a grinder and 2 or 3 chains lying on his bench maybe he grabbed the wrong pitch chain and passed it to you?
livemusic
ArboristSite Operative
It was actually a Stihl dealer that does not carry Husky now that I think about it, lol. He sharpened it as I stood around and as I recall, I was nearby and I think he took a few steps and handed it to me right from the grinder after putting the last grind on it.
Also, it does have 52 links.
Chris-PA
Where the Wild Things Are
Yes you have - this is the clutch cover:
Now bolt up the bar and chain without it, using washers or large nuts as a spacer. Then you can see what is going on. Keep a perspective on this - it is a simple mechanical assembly and you can see how it works.
livemusic
ArboristSite Operative
Yes you have - this is the clutch cover:
Now bolt up the bar and chain without it, using washers or large nuts as a spacer. Then you can see what is going on. Keep a perspective on this - it is a simple mechanical assembly and you can see how it works.
I meant clutch, not clutch cover. You're right, I have obviously taken off the clutch cover!
"3/8" is a nominal measurement, like "2 by 4". Don't even get started on that . . . .
The chain is marked '37' - Husqvarna's code for 3/8 low pro chain.
Philbert
My bet is still to try a new chain - about $16 around here. Some places will even let you return it with a receipt, if you keep it clean and don't cut with it.
Philbert
Similar threads
