squealing hydraulics

   / squealing hydraulics #11  
It could be your cylinder. The seals could be compacted too much. Most pumps will squeal when the cylinder is full extended.
 
   / squealing hydraulics #12  
Sounds to me like the pressure relief valve, a normal sound when you move something to the end of it's travel...

If I raise my 3ph all the way it does this, lowering it slightly takes care of it.
 
   / squealing hydraulics #13  
Mine will make that sound if I remove the stop on the 3 pt. lift lever . It's like the 3 point is trying to lift higher than the piston will travel & puts it in a strain.
 

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