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My hydraulics troubleshooting book states in bold letters.....Hydraulic oil should never exceed 175 degrees F. Temps exceeding 175 will quickly take out seals in pumps, motors, valves and cylinders. The heat will eventually cause catastrophic hose failures. Heat will also cause the hydraulic...

Mick, You can use that speed limiting valve to help warm up the hydraulic oil during cold weather operation. Close down the valve at engine idle. Let the system run a few minutes with that roller speed limiting valve set in the nearly closed position, then open it up for normal operation...

Also, any restriction -- such as a flow limiting orifice, or valve -- will generate a tremendous amount of heat. I'd look for something that is restricting the oil flow, such as a valve that may have been installed as a way of slowing down the in-feed rollers. Joel