I don't want to contradict super99 as he's probably a lot smarter than me on these - especially since I haven't been around this series of Oliver since I was almost a kid - but the remotes definitely shouldn't have constant pressure on them. At least, not constant pressure from the pump. With that open system constant pressure on the remotes would mean you're not flowing through to tank, and you'd be blowing by the relief constantly, creating the heat the OP noticed and wearing out the system in short order. Would also mean any cylinder you hook up would constantly be pressurized/moving.
It may be that if the valves/spools are new and well fitting and if and everything's sealed up well, when the valve's shifted to Neutral there may be a little residual pressure in the remote lines that's not bleeding back, making it hard to connect the remotes. I'm guessing that's what super99 is referring to. But from what the OP says it sounds like the OP has another issue.
A little clarity might be required: where are you seeing the 1400 psi? If at the remotes, the valve spool must not be returning to neutral and flowing through to tank. If the pressure is up-stream of the valve, however, and no pressure at the remotes, it's probably an issue with the PB as others have mentioned. I think these are nominally 1000 or 1100 psi systems, so if you're seeing 1400 psi it's certainly blowing over the relief and explains your heat.
There have been a few posts on the Oliver page about these spools not shifting, either due to a stuck spool or a linkage issue. There was one a couple of months ago that was really good, but I can't find it now.
Those are my thoughts at least, but I also don't pretend to be an expert. I'd post this on the Oliver forum below - there's some really good Oliver hydraulics folks who watch that page.
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