Zetor 7045 front loader valve block problems

Please can anyone help
We have a zetor 7045 with a front loader, recently the front loader stopped working altogether, the rear hydraulics are working fine, we took advice locally and was told to check the pressure on the back hydraulics and they were 2500 which I believe is correct, checked oil is coming to valve block and out of oil block so we have been advised it is the relief valve in the valve block. We have removed the valve and given it a good clean, but still no joy. We have searched to purchase one but cannot find one anywhere.
Please can anyone give any advice or tell me where I may purchase one.
Thank you

If its a cable operated spool, is the cable broken?

Mike

broken cable would only effect one service not lift and bucket tip together.

can you check the supply pressure to the spool valve? , 2500 psi sounds about right,

if the releif valve in the spool is dumping all the pressure its not sealing.... worn seat/plunger seal or weak spring.

a washer or two behind the spring?

or whip the spool off and take it to a local hydraulic specialist

depending on how much time youve got might be quicker and less hassle to fit a replacement spool, either used if you can find one or new off fleabay