Before you go making anything else, I have questions:
1.)How is the loader valve tied into the system? Is there still a hydraulic lift on the tractor? Or is the loader the only valve?
2.) Does the loader valve also have a relief valve. I'm betting it does. Most add on valves do.
Here's some more info:
IH had the implement relief set at 600 PSI for the GT's because that's all they needed for their hydraulic system. The pump can handle much more. Shim the relief valve to 1000 PSI. The SGT's used the same pump, but were set at 900 PSI. The pump will handle at least 1000 PSI safely without issue. It would probably handle 1500, but I don't think you need that much for a loader.
On another note, the PO who built the loader did a nice job, but the bucket is really far forward. If you wanted to help it out a lot, you could re-engineer it. But that may be more work than you want.
On another, another note, loaders on GT's are not really that useful. The JD guys who have loaders on their tractors are knows the really load them down to the point of stupid in my opinion. But, their GT's were designed to have an OEM loader on them too, so they are made a bit better. CC's were not designed with a loader in mind.
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