Service & Maintenance Question
I just bought a Husqvarna 450 with 18" bar. I noticed...escalated
Service & Maintenance Question posted July 16, 2013 by Jeff B
1695 Views, 3 Comments
Question:
I just bought a Husqvarna 450 with 18" bar. I noticed that it only has one nut to tighten down the bar after making an adjustment but most of the images of that saw I see have 2 nuts to secure the bar. I have had the saw throw the 2 chains on me, I have mad sure that the tension was correct and that the bar is not bent. I'm wondering if the one nut is enough to secure the bar or perhaps it is the type of cutting I am doing - small trees up to 16 inch diameter, then I cut of the branches. The chain has come off when cutting off the small branches.
Is it okay to clean up burrs on the drive teeth and reuse the chain(after coming off and catching on the chain catcher) as long as it freely moves on the bar after adjustment or is that not recommended?
Thanks
Is it okay to clean up burrs on the drive teeth and reuse the chain(after coming off and catching on the chain catcher) as long as it freely moves on the bar after adjustment or is that not recommended?
Thanks
Answer
Jeff,
Usually when a chain comes off a bar, and then won't fit into the bar afterwards, its because the drive link tang has twisted. I would recommend just replacing the chain so it fits properly into the bar, there is a reason the drive link is exactly .050 inches, and the groove of the bar is exactly .050, so that the chain doesn't flop right to left, and so the links ride on the rails properly and upright, to give you a good clean cutting action of the chain.
Anyhow, replace the chain but I would recommend checking out why the chain is jumping out of the bar in the first place, you could have a bad drive sprocket, or a problem with the bearing inside the sprocket, or a problem with the bar like un-evenly or poorly warn drive rails, which may need dressing, or a problem with the bar nose sprocket if applicable, also check out that the bar is not twisted or bent, and/or a problem with tensioning the chain, and also a problem with chain lubrication. I would also check that the clutch speed and top speed of the chainsaw are set properly. Carefully check out all of these areas of your chainsaw.
If your Not sure what is causing the problem, and having difficulty doing the root cause analysis, I would recommend taking it to an Authorized Husqvarna Repair center, before just replacing the chain.
I hope this helps.
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THis is a brand new saw, new chain, bar, etc. I surprised it is throwing chains already.
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Jeff,
Sorry, I missed the fact that you did say this was a new chainsaw. Have you looked at the IPL drawing for your specific saw? You have my curiosity about it only having oneer bar bolt and nut, that definitely doesn't sound right, If you have your Parts drawing, I would see if you are suppose to have two bar bolts. You can download the IPL drawing from Husqvarna's product information page, I think you need the model and serial number or year of chainsaw manufacture when you search for the information. Here is a link to the IPL manuals: /images/us/support/download-manuals/?query=450&types=O%2cI&brands=
I hope this helps
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