Chain keeps getting too tight. 029

[redoakneck]

Ok, I feel stupid not being able to figure this out.

I am working on an old 029. Runs good, but after 5 minutes of cutting, the chain gets so tight it won't move!!!


I have tried new clutch cover, bar, and chain.

Tensioner works fine, oiler too.

I adjust the chain to proper tension, snug the bar nuts down, prolly too tight since I suspect that is why it is happening, and same problem!!!



WTF am I missing!!!

 

[e.fisher26]

Clutch drum same same as bar chain? 3/8 .050 7-tooth sprocket?



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Just a home owner that likes the older better made machines

Craftsman 3.7
Echo 290evl
Husqvarna 36

 

[redoakneck]

Yes, this one had an 8 tooth .325, changed it to 7 pin spur. It is pretty worn, maybe go get a new one and try new drum

 

[Warped5]

What brand of chain is it?

Some of the Chinese stuff can be squirrelly.

 

[Motorhead]

I would guess worn spur,chain not riding in the same spot all the time.

 

[e.fisher26]

Look into rim drive drums


-Efisher26-

 

[junkman]

Sounds like the bar groove may be getting pitch buildup ????

 

[jakethesnake]

Chain could be riding up on the spur That's what I'd check the chain driver is worn enough that it tries to climb the spur I wouldn't try a new chain but I bet it would stop doing it

 

[Jon1212]

Ok, I feel stupid not being able to figure this out.

I am working on an old 029. Runs good, but after 5 minutes of cutting, the chain gets so tight it won't move!!!


I have tried new clutch cover, bar, and chain.

Tensioner works fine, oiler too.

I adjust the chain to proper tension, snug the bar nuts down, prolly too tight since I suspect that is why it is happening, and same problem!!!



WTF am I missing!!!

Try a different bar. I suspect the one you are using has a tip sprocket issue.

 

[T.Roller]

I also think the sprocket. I've seen it a few times.

 

[jakethesnake]

Yep could also be in the tip. It's one sprocket end or the other if I had to guess

 

[Jon1212]

The fact that it runs fine for a little while would lead me to believe it has to do with heat, and binding.

If switching to a different bar doesn't provide an answer, try the different bar and chain. If it still happens, I would suggest running the set up without the clutch cover. Just set the bar up, add some washers, and tighten everything up normally. This will allow you to see if the problem is on the PTO side.

 

[Mark71gtx]

Had the same complaint from a guy that brought me an 025. I pulled the chain and saw the spur on top in this picture. I replaced it with the lower one off of a parts saw. Had him back to work in just a few minutes.

 

[bmwpowere36m3]

Both those seem shot...

 

[Mark71gtx]

The used one was a temporary fix to get back to work with. Also a freebie!

 

[redoakneck]

I'm betting it is the spur also, just got a rim kit for it, see what happens tonight!!

 

[redoakneck]

The 7 pin I tried was pretty worn too, dealer said .005 groove is considered worn!!!
Mine are halfway between the two posted, so pretty worn!!

 

[Barneyrb]

Oiler putting out good?

 

[redoakneck]

Oiling fine,

 

[Deets066]

Turn the tensioner.....

To the left