Hydraulics dont work after serviced

I have a NH 1720 with front end loader. The hydraulics worked fine until I decided to do some overdue maintenance. I got the tractor from my grandpa and he didn't take good care of the service and maintenance on it. I'm trying to get it back in shape. All the hydraulic lines were very rough. I replaced all of them. Dumped the hydraulic fluid from all three ports, Changed spin off filter. The filter has fluid in it. Now I can't get the front end loader or the pto to operate. I thought there might be a bleed valve on the hydraulic pump but I'm not seeing one.
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