No Hydraulic pressure - Raising boom L554

[Dayz]

Guys, New to the forum here...great site! I just got an older L554 from a friend of mine and trying to make it work. The machine ran out of oil and they let it go. I put oil in it and tried it out. Everything works except the boom, I cant seem to have oil pressure in it. I have tried keeping the pedal up and down, there is pressure to lower the arms but not to raise them. I open the fittings at the bottom of the cylinders and noting, one had a little oil in it but nothing under pressure. What can be wrong, how do i diagnose this problem, I am new to tractors and hydraulic. Do I need to bleed it somehow? Thanks for pointing me in the right direction

 

[Tazza]

Sounds like the safety interlock is locking you out. Some had seat switches, seat bar and even seat belt switches. If one is not detecting you are in the seat, it will not unlock.
If they are indeed working, you could have a bad coil to un-lock the lift function in the control block.

 

[Dayz]

Sounds like the safety interlock is locking you out. Some had seat switches, seat bar and even seat belt switches. If one is not detecting you are in the seat, it will not unlock.
If they are indeed working, you could have a bad coil to un-lock the lift function in the control block.

That sounds interesting, will look at the electrical. That is a great idea, thanks Dayz