Old oil in lines and cylinders

[Babe Winkleworm]

I recently sent with my pumps into PP for repairs. I got some water in one and the oil looked like scrambled eggs. Before installing the new pumps how do I make sure and get all the old oil out of the lines and cylinders prior to hooking it back up and charging the system with new oil? Thanks

[KandKKustomz]

If you open and close the poles manually ( my hand) with the lines off the pump it will force the majority of the oil out. I suggest having the lines in a container to catch the fluid