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Question:

Why does my Komatsu PC160 excavator slow down?

My PC160 slows down when I run it for an hour or so. Its not over heating and my filters are clean, the hydraulic fluid and type is good.The cowd in and outand boom up and down is the most noticeable, but I'm sure the swing is affected by this seeins how everything is set based on the swing. Any insight would be greatly appreciated.

Answer:

might be the pressure relief valve on the pump when it gets hot? maybe a pinched/crushed hose that collapses when hot?

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