Hydraulic problems on IH 3400a need help

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asked Jan 29 in Tractors by Jamie.knutson (120 points)
I just got a 1976 International 3400a backhoe and am having trouble figuring out what is wrong with the hydraulic system. The bucket and loader work fine but i have no hydraulics to the steering or backhoe. If i curl or un-curl the bucket all the way or raise or lower the bucket all the way and hold the lever on and the tractor bogs down a little but only when i do that do i have hydraulics to the steering and backhoe. Interesting problem and i have spoke to a few people and no one knows how to trouble shoot it to figure out what is wrong first, and how to fix it.
Any ideas?

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