Controls - 38 HT220 Operator’s Manual Center Console CMW Item Description Notes 7. Radius control To increase pressure on the left track, turn knob to left. To increase pressure on the right track, turn knob to the right. To equalize pressure, turn knob to center. 8. Emergency engine stop To stop engine, press button. To reset emergency stop, turn switch to the right. Do not use emergency engine stop to stop engine on a regular basis. 9. Parking brake To engage brake, move to up position. To disengage brake, move to down position.