The bar tensioner lets you adjust the chain tension of the Partner 350 chainsaw: it moves the bar along the guides as the screw is turned.
Replace it if the thread is stripped, the gear teeth are broken, the plastic is cracked, or the chain does not hold its tension. A loose chain wears the bar and is dangerous, so it is better to replace a defective mechanism right away.
After replacement, check the unit at idle and under load: there should be no leaks, play or unusual noises.
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