If you don't have an AGCO dealer you can trust I suggest contacting one of the dealers listed below. Also there is smaller relief valve for the steering in the flow divider assembly on the left front of the main casting.

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Also if when you first open HPOCA site you can click on Flag logo in the upper left and on the page that comes up, click on links, lots of good ones for parts etc. Also note changes in above reply, new link should get you closer to the parts book.