Go BottomHELP TROUBLESHOOT HYDRAULIC S ON 3PH BACKHOE
 | MIKE IN SOUTH CAROLI
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1999-06-12 5017
mY BACKHOE QUIT OPERATING TODAY AND I WAS WONDERING IF ANYONE COULD HELP ME FIND THE PROBLEM. tHE PTO PUMP SEEMS TO BE PUMPING BUT WHEN OPERATING THE CONTROLS i GET A HISSING NOISE AND NO MOVEMENT OF THE HOE. FLUIDS ARE AT THE PROPER LEVEL AND THE CYLINDERS WILL MOVE SLIGHTLY IN EITHER DIRECTION AND THEN QUIT. aLL i GET IS A HISSING NOISE AROUND THE CONTROLS.. NOTHING WILL MOVE IE...THE OUT-RIGGERS, BUCKET NOR THE TWO CYLINDERS WILL MOVE. oNCE i LOCATE THE PROBLEM CAN THE PUMP AND OR THE CONTROL BOX BE REBUILT AND IF SO HOW EXPENSIVE CAN THIS GET.... tHANKS FOR YOUR HELP
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| KG
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1999-06-12 5020
It sounds like you may have a pressure relief valve that is stuck open. There is a spring loaded valve that opens to allows the oil to return to the tank when a set pressure is reached. A piece of trash in the valve or a broken spring can cause the valve to stay open all the time. The relief is often on one end of the bank of control valves. Most often there is a cap over the spring that can be removed (with the pump stopped). You should be able to check the spring and look in to see the valve seat.good Luck ....
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| Ron
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1999-06-12 5022
This may sound funny but make sure you have your PTO in the engaged position, ....
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