Stihl masonry saw

[NJA]

Not my saw but been asked if I'd know why the chain keeps coming loose and even coming off.  I haven't looked at it but apparently local dealer has and say nothing wrong with it...

Anyone had any experience with these or any ideas what I should suggest he looks for? 

[Scotty2809]

I had a look at one a few months ago that a contractor was having trouble with. 

A couple of things i noticed was the side casing only had a small surface area to clamp the bar, so i got some 400 grit paper and smoothed it down, resulting in a flatter surface for the side cover to clamp. 

Make sure the bar ways are cleaned, especially around the bar sprocket. you'll find that most won't connect the water and do dry cuts, thus clogging every orifice....

cant really see clearly from the picture, but check the drive links aren't dished. you should use flip the bar and chain frequently. The chain drive links will wear, and aren't the same as a standard chain on a saw, they cut both directions.

Check the rail gauge isn't too sloppy.

Check chain tension too. it should be slacker than a conventional chain. 

Rakers look like they need taking down a few thou as well. 

Just give everything a good blow out and make sure it's getting plenty of water.  

 

i'm guessing it's the 461 model? 

If/When you get hold of the saw, post a few pictures and i'll try and help diagnose any issues.

 

[adw]

Diamond chains are always run fairly loose, and rely on PLENTY of water to reduce heat and wear, I would say they are not using enough water, or the water channel in the bar is blocked. Is it Stihl, Husqvarna or ICS chain?

 

[NJA]

Really appreciate the replies I'll send this info back and see if its a simple fix he can do himself