SYSTEM / Control System Fast Travel Mode 1. With the travel mode switch turned to the (FAST) position, electrical current flows to sole- noid valve unit (SI). 2. As solenoid valve unit (SI) is activated (shifted), pressure oil from the pilot pump is supplied to the travel mode selection valve. 3. For this reason, pressure oil in the travel circuit in control valve is supplied to the tilt pistons. Con- sequently, the travel motors rotate in the fast speed mode. (Refer to Travel Device group / COMPONENT OPERATION.) From Main Pump Solenoid Valve Unit (SI) Brake Valve Pilot Pump Travel Motor Travel Mode Control Valve MC Travel Mode Switch Parking Brake Tilt Piston T2-2-49