When running my chainsaw chain comes off. - McCulloch Garden

Check chain oil reservoir, assuming it is full and pathways are clear, your oil pump might be toast , or not set up properly. Usually, there is an adjusting screw. Don't run it dry.

The only time I saw this was when the saw was run with the chain too loose. The chain should be snug al the way around the bar. If it is run loose for too long the chain will develop burs on the driver links. Now the driver link will not fit in the groove on the bar so the chain is tossed off. Replace with a new chain

a couple things will cause a chain to stretch running it to tight running low on oil a dull chain over heats it

I put a new bar and chain on my craftsman 18" chainsaw because the chain keeps coming loose. I am still having the same problem, after running 10 seconds, the chain falls off.

The chain only comes off the bar if, the chain has become lose and de railed, or if the timber you are cutting is very springy and you are trapping it in the cut, our twisting it in the cut, if the saw is not oiling the chain correctly it will stretch and if not addressed will come off, once it has come off the drive links are usually damaged, you should realy start again with a new chain, when running close to a clean peice of wood you should a steady stream of chain oil coming from the end of the guide bar.

The engine should 4-stroke lightly when running at speed unloaded, but immediately 2-stroke when cutting. Adjust the H jet CCW somewhat to accomplish this. Make sure the chain is being oiled properly, the chain tension is correct, and the chain is sharpened properly. If this doesn't help, then remove the bar and chain, and wash out the clutch internals with spray carburetor cleaner to remove excess oil. Hope this helps!

If the chain is turning, it has to cut. Make sure the cutting edge of the teeth are coming toward you on the lower run of chain. Good luck!

Is the chain brake on? Pull the lever your knuckles are against toward you to unlock the anti-kickback brake.

pull the barcover and bar off and you will see the clutch put the chain back on the clutch and put the bar back on and run the chain down the bar and put the cover back on and you will see a little screw in the bar cover are in front of saw by bar tighten that screw until slack is out of chain then tighten bar nuts.

The bar MUST be straight. Soak the chain with penetrating oil. If that doesn't free it up, replace it. If it is kinked sideways--replace it. Never run a chainsaw with damaged parts.