I have a 2018 JD 544k with 777 HR the problem I am having is the cooling fan is not working properly, the fan is running at 200rpm at 100% command, and about 500 rpm at wide open throttle, I tested for power at solenoid I have 26v when running, and tested solenoid, this machine does not have reversible fan valve, the hydraulic fluid is at the correct level any advice would be appreciated
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