Good afternoon friends, I have a d51ex for a concert here, and I can't identify the cause of the problem, the symptoms are when it works for 1 to 2 hours the fan speed drops from 1500 to 1000 to 800 rpm, and it doesn't go up anymore, What I've done so far, I replaced the fan's hydraulic motor assembly with new ones and checked the control rod that controls the fan and its pressure valve, everything is ok, one detail I took care of is that the temperature of the hydraulic oil does not gradually rise goes from nothing to half in 2 seconds after working for a while
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