We have just replaced the slave piston in our Triumph 5551 paper cutter (leaking). While finishing up the job, we noticed that there is no place to bleed the line of air. For the life of us, we cannot find any reference (or nipple) to bleed the line of air. Do these cutters need to be bled? How can any hydraulic system not have a system (process) to bleed the lines? Our pressure is below the max, and wonder if there is air in the lines. Can anyone help us understand how to bleed this (or similar) cutter?