Has the chain ever came off the saw?and i'm going to assume that it is the correct chain for the saw...reason i ask about the chain comming off the saw is that when it does the driver have a tendency to become nicked and will heat up the clutch because the saw is trying to drive the chain links through the chain slot.also you need to look at the drive sprocket to see if there is any wear on the teeth....also over tighting the chain will cause the clutch to heat up.
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If this is a Husqvarna, then it is crucial to make sure your brake is not set, when removing the cover. Rotate the blade to make sure it is moving freely, then remove the cover without setting the brake. However, as time went on, it still happened occasionally and seemed to be a defect in the saw. I had a Husqvarna Rancher, which drove me berserk, until I removed it, entirely. Not recommending that last course of action, but it is something that is common to this saw.
Not all 345 machines had an adjustable oiler, it is retro fittable if it does not, however if it hs an adjuster, the screw is located on the bottom of the saw between the cranckcase and the fuel tank, just below the sprocket, there will be an oil symbol and a - and + sign there, the pump is three position, for 13/15/18" bars.
Depends on what model we are talking about, if it is a 340/345/350 you need to remove the fuel tank, the cylinder bolts are on the bottom of the crankcase, the crank is sanwiched between the cylinder and the tank assembly, so it is a full strip down to remove the cylinder.
This machine has a geared side adjust tensinor, i woud say the gear system may have striped, remove the clutch and drum, remove the allen screw securing the silver bar protector plate, the adjuster will now just lift away complete, check its function, replace if required, check the oiler is working, hold the saw over some cardboard, rev the engine and check to see if there is a good oil spray onto the card.
Most saws are pretty much the same procedure.....here's a decent link. Some saws will give trouble if the brake is on when you remove the side cover so make sure the chain moves freely before removing the side cover.
Here's one on tensioning the chain...
Try to turn the chain by hand--if moves freely, the clutch assembly under the cover may be overly oiled. Remove the bar and chain, then wash the clutch drum and shoes with carburetor spray cleaner. Make sure the chain brake is not set. Hope this helps!
Turn the Hus 345 chain saw upside down, you may see a little Icon of a oil droplet and a + - arrow by the chain. THe adjustment screw is not pictured in any of the standard user manuals,. but it is a small black slot headed screw over a rectangale metal tab by the chain. I believe if you turn it counter-clockwise, it will give you more oil,, It did for me. If you have the bar off, you can start the saw and see it come out the hole, that would verify your oil pump is working. Make sure the holes on the bar are clean also. running the saw at a fast idle for 1 min should oil the chain well enouth that it starts spraying off the end of the bar when you gun the engine.