Inspecting John Deere 6068 Accessory Drive Belt and Bearings

An important annual service check on a diesel engine is to check the drive belt and bearing condition on all engine-driven accessories including the alternator and coolant pump. The video below steps through this simple service check on our John Deere 6068AFM75. The engine is a 266 hp, M2-rated marine diesel that is just over 10 years old and is approaching 11,000 hours of service.



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4 comments on “Inspecting John Deere 6068 Accessory Drive Belt and Bearings
  1. Jack Apple says:

    James, I love your helpful videos like everyone else!
    I think I noticed a screw/bold on the back of the alt that looked like it was loose at 22:26.

    • Good eye. I agree it does look like that machine screw is loose but it’s actually just a screw with integral washer where the lock washer underneath the integral washer is smaller than the washer and makes it look like the machine screw is not pulled up tight.

  2. Mike Ukena says:

    Directly below the tensioner, there appears to be a water hose with a missing clamp. Am I seeing it correctly? Or is it just out of view?
    Also, what a dream changing a serpentine belt on that engine compared to a car with a tight fitting V8!

    • Your right about the maintenance access on this engine being a dream compared to some cars. It’s pretty nice. There are some jobs that are still difficult but, generally, we have good access. On your question on the unclamped hose, it’s probably just behind something in the video. There is a 2″ cross over pipe visible at that location and a heater hose and both are properly clamped. Thanks for asking about it though.

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