Hi Bill, If it is a Diesel engine the hydraulic pump is at front right of engine, IIRC it is driven by cam gear. If you have power steering there will be two hydraulic pumps, second one is stacked behind the first one. Go to CaseIH parts at: http://www1.caseih.com/northamerica/PartsService/Pages/search.aspx then search for 434 page 5-14 shows hydraulic pump and plumbing. Is it cold where you live? Since it stopped working all of a sudden, I would suspect ice somewhere. When we had a 434 with a 1501 loader and it was -30F sometimes the hydraulic controls for the loader would freeze and stop working.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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