Just purchased this hoe and it is having trouble lighting itself in the boom down operation. The main control valve was changed out by komatsu dealer along with the main pump and complete new engine approxamatley 2500 hrs ago. What would you recommend be the steps to diagnose this problem? I believe there is a boom down control valve and I'm guessing the other thing to check would be the lift cylinders. Any help our thoughts would be appreciated. Thanks.
Komatsu PC 400-6
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