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You may want to take a look at the various air system schematics in the Student Handout to understand how the air system works
https://www.steelsoldiers.com/showthread.php?170940-See-small-emplacement-excavator-flu-419-manuals-and-a-student-handout
Before you go ripping and tearing, the air system does run a few things like
Brake Assist
Remote Throttle control switch air cylinder
Air shifter
4WD
DIff Locks
Diff pressurization
Trailer Brakes
I believe you are correct one air tank is for the vehicle supply and the other is backup for...
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