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The proceadure for adjusting it is in the TM's. However, it didn't say what it did. I understand a little better now. Instead of letting the truck go to full RPM, you bump it up against the air cylinder plunger to set at the deisred RPM when the remote throttle is wide open when working with...

Does anyone know what the fuel pump air cylinder does on the NHC250? I've read how to adjust it, but I don't know what it does. Also, the adjustment procedure says to start the truck and wait until the air pressure builds up, then, open the throttle wide open and adjust the cylinder...