Why does my Hitachi EX120-5 stall when traveling or using the boom?

Kizzy Klozenberg

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Hitachi EX120-5 excavator runs fine at idle, but after traveling about 30 meters or using the boom, the engine struggles and stalls. Someone suggested the stepping motor could be the issue. Does it need calibration after replacement, or could this be something else? Has anyone experienced this problem?
 
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