Hey guys having an issue with an older Hitachi excavator. The machine went into major failure mode best i can figure after the Angle sensor shorted out. Hydraulics very very slow. Would build pressure like it should just pump output was minimum. While diagnosing the machine i also found a shorted out pump high speed solenoid. So ended up replacing both pump solenoids. When the angle sensor shorted and before it was replaced it killed the power to the PVC box. I opened the box cover to check for damage while the bad A-Sensor was still plugged in and the large R1 resistor was so hot it put a blister on my fingers! Unplugged the A-sensor and the PVC LED lit back up and started flashing at a normal interval. So replaced both pump solenoids, the angle sensor, checked all fuses and checked codes in the PVC. Fired machine up and moved slowly for the first few moments but started getting faster and faster until it started stalling the engine out with the hydraulics the pump went to full swash. Rechecked the codes and found code 26 pump control abnormal. Also has a code 22 for DP sensor but im not concerned with that at the moment as i have worked on this machine in the past with that unplugged and operation was normal. My concern is that the PVC has been damaged by the shorted out sensor and will need replacement. Anyone ever ran into this before??? Like i said before the machine when fired up hydraulics will run slowly but then after a few minutes the pumps are at full swash and start bogging the engine and stalling it out. Thanks in advance for any help!
Hitachi EX200-3 problem
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