Komatsu 51px #22 hydrostatic Hyd fault

hi I'm looking for some help on my dozer51px which brought a Hyd oil light on as a fault and stopped travel, the dozer was in a very isolated area so the operater removed filters and tried too flush them clean the replaced,the dozer worked for a few hundred yards untill it broke down again, a electrician from Komatsu went and said it wasn't electrical but the PMT cartridge was only showin 11bar and should be 30 has anyone had this problem any info would be great thanks

Komatsu 51px #22 hydrostatic Hyd fault