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Message: <blockquote data-quote="Hotrod1830" data-source="post: 96665" data-attributes="member: 4331">It sounds exactly like air in the lines. The cylinders will act real "jerky" through their travel. More so on the extend than retract. It is often accompanied by a strange sound when the air gets back to the pump. Simular to a vehicle low on power steering fluid. Is this what you are describing? If yes, continue reading. I am going to assume you just bought this machine? Has it been doing this the entire time, or did it just start doing it? The obvious question is how is the fluid level? You said you checked it, but lets make sure. The fluid level is checked on the side of the chain case with plugs. You should remove the UPPER plug and have fluid run out. If not, fill it unit oil runs out the upper plug.Next is prior service. Does it have any new hoses installed? If yes, sometimes air will get trapped in the system and will take some time to escape by itself. Sometimes longer than most new owners will wait. You can bleed the system to speed up that process if that's the case.Next is the pump sucking air. Make sure the suction hose is in good shape. No cracks or weathering. Just because they don't leak, doesnt mean they are sound. Also make sure all the clamps and the filter are tight. I have had ALOT of cases of loose hose clamps on the suction hose cause air in the system.</blockquote>