I've seen similar problems on many of the older IH hoes - with and without the extendable boom. IH backhoes with the dual hydraulic systems are different from any other backhoe I've ever worked on.
I've got a 3414 right now, with a 3120 backhoe. When it gets hot, the boom won't raise unless I pull steady on the swing lever. They are supposed to be two totally separate systems each with their own pumps - yet holding onto the swing forces the boom to work.
I suspect your problem is not because of hoses hooked wrong (but they may be also). I suspect that one of your pumps is bad, and/or you've got a bad check-valve somewhere. 3514 tractor uses one pump just for the power steering AND swing/stabilizers on the hoe. The other pump runs the front loader and all other functions on the backhoe. If one pump is bad, or, a check-valve goes bad letting oil from the swing-stabilizer circuit leak into the boom-curl-bucket circuit, you get some very strange problems like you've described.
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Today's Featured Article - Field Modifications (Sins of the Farmer) - by Staff. Picture a new Chevrolet driving down the street without it's grill, right fender and trunk lid. Imagine a crude hole made in the hood to accommodate a new taller air cleaner, the fender wells cut away to make way for larger tires, and half of a sliding glass door used to replace the windshield. Top that off with an old set of '36 Ford headlight shells bolted to the hood. Pretty unlikely for a car... but for a tractor, this is pretty normal. It seems that more often than not they a
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