The hose carries oil from the tank to the pump of the Partner 350 chainsaw and provides lubrication of the bar and chain. Manufacturer: EMAST.
Replace it when the rubber has hardened, cracked or lets oil through. Signs: leaks, a bar without lubrication. After replacement, check the oil delivery.
It is best to do the work on a cooled engine with the ignition off, and to tighten the fasteners without overtightening, so as not to strip the thread in the body.
