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Cat 247b3 AC grinding

chevyguy14

Member
Joined
Jun 26, 2017
Messages
16
Location
St. Cloud
Hey guys I have a 2013 cat 247b3 that makes a grinding noise when I turn the ac on. If the ac button is off or if it’s blowing heat it doesn’t make the noise so I know it’s ac compressor or pump related. This year model has the hydraulically driven ac compressor so how do I diagnose if it’s the hydraulic pump that’s going bad or the compressor. Any ideas how to test them so I’m not taking a shot in the dark on which one’s going out or does anyone know which one is more prone to failure? Thanks
 

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