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Message: <blockquote data-quote="Tazza" data-source="post: 10116" data-attributes="member: 82">That could indeed be air....  But as it seems to be worse on the left side, so it really could be a problem with the hydro pump too. The hydro pump can be worked on by anyone with patience and common sense. If its just the swash plate that is worn you can use sand paper and a piece of glass to make it flat again. But this usually just causes low power and not airation of the oil. It really sounds like a filter issue but as it only seems to be a real problem on one side which sounds like the pump may need attention, its hard to say exactly what it is..... Its hard to say its the pump or motor or even a filter without fiddling more. You could try swapping motors over but it depends in your machine is a simple spline fit or if its the older style that has a bolt through it making it a pest to remove.Sorry i can't be of more use than that, its really hard to say what it is without actually seeing it and trying a few things.One last thing, is there a square block on top of the hydraulic pump with a 3 hoses going in to it from the left side (looking from the bucket at the pump)? The older machines ran a suction line filter behind the centre hose, behind the fitting in the block (the fitting that looks larger than the other 2). When it gets clogged it causes problems EXACTLY like what you are having. If you have that style, pull the hose and fitting out and replace or give the filter a good clean with diesel and compressed air.</blockquote>

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