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Two things to keep in mind when operating these trucks - When starting/stopping the engine, always top switch on, bottom switch on; then bottom switch off, top switch off. Doing the switches in the wrong order can fry the protective control box. And don't use reverse in low range, unless you...

Thanks, Mullaney. I realize I didn't clearly answer that part of his question... :confused: I edited my post for future clarity. Cheers

The 939, 939A1, and 939A2 have some differences (engines, tires, CTIS, etc.), but most of the controls are the same. Take some time to go through the -10 manual, it will explain the differences, the similarities, where everything is, and how everything works. It is a great reference source for...

Can I hazard a guess that you are not familiar with how to find the operators manual? It will explain all of the controls in detail for you. That and the maintenance manuals are all available here - https://www.steelsoldiers.com/threads/updated-tms-tbs-mwos-for-the-m939.168990/ Go down the...