All hydraulic systems should have a gauge. The gauge is the window to the hydraulic system. In addition to indicating the operating pressure, the gauge can also warn you that something is going wrong.
IN A LIFTING SITUATION THE GAUGE WILL READ AS FOLLOWS:
• The gauge will not show much of a pressure rise until the cylinder contacts the load.
• The pressure will start to rise after the cylinder has contacted the load.
• The pressure continues to rise with each pump stroke.
• When the load starts to move, the pressure will remain constant. If you continue pumping and the load does not move, you may have reached the end of the cylinder stroke, or part of your setup may be yielding.
The gauge shows more than maximum pressure. It can also alert you to what is happening throughout an operation.