Ford 3600 front end loader not working

[Caocala]

What would cause the hydraulic system on the front end loader to stop working ? Rear hydraulics are working fine. Bucket is locked up and won't go up or down. Fluid is full and hose clamps/lock are closed. System was working fine and just quit. I have a 1981 Ford 3600 with just under 4000 hours.

Thanks,

Caocala

 

[J_J]

Check any Qd's you have.

Does the fluid go through the FEL valve first?