How to Choose a Hydraulic Pump for a Hydraulic Cylinder

Once a cylinder has been selected that meets your projects required minimum, maximum heights and is rated to enough capacity for the lift required a suitable pump can be selected to operate the cylinder. The proper pump is chosen based on how the operator will be using it. There are advantages to each type of pump.

The manual pumps are cheap and simple and do not require an outside power source other than the pumping acting of the operator. Air powered hydraulics pumps utilize compressed air to develop hydraulic pressure and require much less effort from the operator. If compressed air is unavailable or if solenoid operated valves are essential, Electric pumps plug into a power source and turn electric power into hydraulic power with limited effort from the operator.

The pump must also match the oil requirements of the cylinder. We recommend at least a 15% buffer in oil capacity of the pump to the requirement of the hydraulic cylinder. For example, if a 50 ton 6” stroke aluminum cylinder is selected the oil capacity can easily be found online: The table shows that the oil capacity of the 50 ton 6” stroke cylinder is 69 cubic inches so let’s add in a 15% buffer bringing the oil requirement to 79.35 cubic inches. Let’s go ahead and find an Aluminum manual pump to operate this cylinder: Looking for the first pump over 79.35 cubic inches we find that the ZHP-80A is a great fit to operate the ZR-506A cylinder. Now all that is left is to connect the pump to the cylinder before we can get this hydraulic setup working.