I tried to post a pictorial of the hydro system but it won't work.
Go to the IH parts page and type in 300 then scroll to the U and hydraulics.
The link below may work.
The pump is more than likely the problem. If you have the aluminum pump they usually cannot be rebuilt.
BUT, I had a similar problem with my case 1030 and it was the relief valve sticking and NOT the pump. All I did was take the relief valve out and clean it and put it back in and it works fine.
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Today's Featured Article - Tractor Profile: Case VA Series - by Staff. V, VC, VI and VO). Althouh the Case VA looked much like the V, it shared no major components with its predecessor. Except for military units, the production of the Case VA was interrupted in July of 1942 due to World War II. It resumed again in 1944 and continued until 1953. It started up briefly later on in 1953 and continued on a very limited basis until 1956. The VA Series included the following models: VA: Fixed front wheel tread VAC:
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