What's the difference between movement solenoids, injector solenoids, and the engine shutoff solenoid on a Cat 140H?

[Jayne_Monie]

I'm working on a Cat 140H grader and need some clarification. Can anyone explain the difference between the movement solenoids and the injector solenoids? Also, is the engine shutoff solenoid the same as one of the movement solenoids, or is it a completely separate component? Any help would be appreciated.