hmmm, havent experienced this yet. hints:
Did you use the right oil?
Does the pump make strange sound?
Is the suction filter in place?
Is the plastic tube (filter housing) intact?
Maybe the oil level is too high? The tank is demensioned for the highest mast possible. If you have a lower mast you dont have to fill it all the way, only just enough for the mast to go up.
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