Recently purchased in less than operating condition. Has a military specific serial number different prefix versus civilian model. Being i work for Caterpillar I have access to most anything information wise. We have a guide that converts military to civilian in most cases it is correct. The machine serial number is 90R00137, guide states a 13U civilian is equivalent, close but needing help. No M designation on the US Army data plate. No luck in searching for publications online. Anyone have a book stashed or the number for the publication?