Hi, I have a Jacobsen HR-5111 11' mower with Kubota 51HP diesel. Unit works perfect, runs at a steady 170-185 degrees even on warm day. But I'm getting a problem with the hydraulics on the unit. When you run the unit for about 10 minutes...the low hydraulic charge light comes on, and it stays on till the unit is cool again. There is no abnormal sound coming from the pump, no diffrence in power, decks or drving the unit. I don't know what they problem would be, but I have a question here. Could this be a bad sensor, because if there really WAS low hydraulic pressure the low filter pressure lights would both come on too? Thats just question, I'm just asking for the possibility of a bad sensor. Anyone had this problem before?