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Anything over 250F will start to cause damage to the oil. My rule of thumb with hyd's is I should be able to touch it bare handed for a split second. May not be able to hold on to it, but still touch it with out burning. Which in the winter is a nice way to warm your hands.

46 Should work fine in your application. Your not running any high speed motors or spindles. If the heat issue persists, check for a stuck pressure relief valve. Also installing a couple pressure gauges lets you see what changes between cold and hot operation.