Hi, I have a Hitachi ex300lc-3c that is stalling under load. Engine is running fine until I engage the hydraulics, then when lifting boom engine bogs down and stalls. Had rebuilt pumps approximately 200 hours ago. It was operating fine all day then all the sudden this happened. Any ideas where to start looking? Appreciate any help.
Check for a plugged screen in the banjo bolt at the fuel transfer pump inlet. A similar screen is sometimes used at the fuel filter inlet also.