It’s real easy to do: you hop in the cab, and to get the day rolling in your D7R II CAT dozer, you start cranking down on the engine starter.
And guess what? Your dozer won’t start, and you’re going nowhere! Matter of fact, you'll try all day long. Why? The vehicle won’t start unless the parking brake is locked (engaged).
If your engine won’t start, as your first check, ensure the parking brake is locked.