One of the most common, hydraulic systems issues we help our customers troubleshoot is hydraulic systems running too hot. More often than not, this is due to having a pressure-compensated pump and the fluid being dumped over the relief rather than over the compensator- creating heat.
To learn more, watch this follow-up video (part 2 of Hydraulic system running too hot?) of John Henry Foster's hydraulic guru, David Granade- Fluid Power Specialist, as he demonstrates how adjustments on the pump compensator and main relief valve, can help.