Where is the automatic accelerator for unloading cement tanker?

The automatic accelerator of the cement unloading tanker is on the console of the truck.

When operating the remote throttle switch at the rear of the mixer truck, it is necessary to fill or unload, and sometimes it is necessary to fill the door to accelerate the rotation of the tank. At this time, it is necessary to turn on the remote throttle switch in the cab and press the operating lever at the rear of the mixer down, which is the refueling state. When finished, stop the rotation, return to the cab, close the PTO, and the accelerator pedal will return to work.