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We have a small trackhoe, when the bucket is at waist level and you want to go up the bucket drops about a foot before it goes up. The pump was recently rebuilt. Is there air in the system? How do we remove it?

Why does my main boom go down before it goes up when I pull back the main boom lever. Is it air in the system and how would I purge it? Thanks.

We have an older Yanmar trackhoe. Blew up the pump. Rebuilt it, now the controls don't work. Perhaps some trash in the control bank somewhere? We unhooked a line at the control bank and have line pressure so the pump is working. Where would the relief valve be in that older system? I am...

We have an older Yanmar trackhoe. Got it in a bind and blew up the hydraulic pump. Rebuilt the pump and now the controls don't work. Could it be the parts from the pump got into the controls?