Bleeding Hydraulic Hoses on Hoelscher Hay Accumulator?

Help! Found a leak in one of the 24-foot long hydraulic hoses on our Holscher hay accumulator. We replaced both very worn hydraulic lines. Now am having difficulty getting the accumulator to function properly and suspect air in the hydraulic lines is the culprit. Can anyone tell me how to proceed to bleed the air from the hydraulic lines on the accumulator?

 

When the hydraulic system is activated by pushing the joy stick to the right, the bale lift arm goes up and stays up and then the trailer platform starts up until it is blocked by the bale lift arm. When I reverse the hydraulics by moving the joy stick to the left, the platform goes down and so does the bale lift arm.

 

Any ideas for how to resolve this problem would be appreciated.

Bleeding Hydraulic Hoses on Hoelscher Hay Accumulator?