sorry to bother you having trouble using this site , I have a 1999 lull 844c-42 with a john deer 4045t engine lost all hydraulic pressure of checked all the usal suspects being check valves and reliefs cant find anything wrong is it possible pumps failed causing inital pressure failure not allowing activation to my knowledge pumps are there to create flow not pressure reason i ask is i have no pressure reading at test ports or from pump witch i believe to be bad, i have also blocked off spool assemblie to see if pressure would build seems to dead head from flow but still no pressure rise i also pulled pumps from transmmision to check shafts and couplings nothing wrong there as well any info would be appreciated