Not really a heavy equipment mechanic but have a few suggestions. Check intercooler piping and boots also check end play on turbo. Basically wiggle the shaft and make sure it isn’t flopping around
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In my opinion most units are very comparable. Most problems I run across are installer related on split units if it is a split try to be there and make sure the installer evacuates the system correctly using a micron gauge. And make sure the warranty card is sent in or registered or...