IHI IC75-2 Operation Manual page 64

3. Travel speed control dial
This adjusts the speed of travel operated with the
joystick.
Low speed End : 0 ~ Very slow speed
High speed End ：0 ~ Maximum Speed
When you want to travel a narrow course, for instance,
setting the dial at the low speed side makes it easier to
travel.
4. Engine speed control dial
This adjusts the idling speed of the engine.
IC75-2 ENG
OPERATION
Low speed
3-12
Low High
speed speed
High speed
CA-C201040