Looks like the indicator that your hydraulic oil temperature is hot. I had the same problem on my maiden voyage recently. Turns out the fan for my oil cooler wasn’t working. When it came on I would pull over to let the oil cool down, or push my bus less hard (dropping from 65 MPH to 55MPH). It doesn’t take too long for it to get back in the right temp range. Another option would be driving more at night once temps drop a bit.
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