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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