Repair guides and support for weed whackers, also known as string trimmers, weed eaters, edge trimmers or line trimmers.

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Why is the end of the shaft, and the oil, overheating?

After running the weed whacker for a few minutes the end of the shaft becomes so hot that it will melt the cutting head, you can also hear the oil boiling when you turn the engine off.

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My guess is that the bearing or bushing centering the rotating shaft that spins the cutting head has seized or is damaged beyond repair. It may be easy to remove the cutting head and possibly access the failed bearing/bushing without too many specialized tools.

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Make sure there is no dirt and junk around the engine unit. The shaft may need to be re-lubricated with a high heat lube.

If the unit is a 2-cycle engine, make sure you have the correct fuel-oil mixture in the tank. Having no oil in the fuel mixture will ruin the unit, and possibly lead to melting parts.

If the unit is 4-cycle (not common for a weed wacker) then make sure you give it an oil change.

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Also check there is no weeds or extra trimmer line wrapped around the shaft causing friction and heat to build up. Check (WITH MOTOR OFF) if the spool is easy to turn and free of debris buildup. Remove spool to check for excess movement from the shaft as said previously. This may be as simple as replacing the shaft bushing or bearing depending on which model you have.

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May be the way you start using it have problem. You can prefer to this to find out a good tip when starting this machine http://weedeaterguides.com/how-to-load-l...

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