COMPONENT OPERATION / Travel Device Fast Speed (Minimum Displacement Angle) 1. When pilot pressure (7) from solenoid valve unit (SI) is supplied to travel mode selection valve (1), pilot pressure (7) is supplied to chamber A (10) through orifice (9) in spool (8) and moves spool (8) to the right. 2. As spool (8) moves, pressure oil from the control valve acts on tilt pistons (5) through the counter balance valve and spool (8). 3. Therefore, tilt pistons (5) pushes swash plate (3) and the displacement angle is reduced to the minimum. 4. Consequently, the travel motor rotates at high speed.
(Refer to the Control System group/SYSTEM as for the control circuit.) Selection Valve T1J1-03-05-008 1 - Travel Mode Selection Valve 4 - Ball 7 - Pilot Pressure (From So- lenoid Valve Unit (SI)) 9 - Orifice From Control Valve 2 - Spring 5 - Tilt Piston 8 - Spool 10 - Chamber A 3 - Swash Plate 6 - Plunger T3-5-11 8 9 7 1 2 5 6 Mode 10 ve 4 3 5 4 Counterbalance 3 Valve 2 5 6 Mode 10 ve 4 3 5 4 Counterbalance 3 Valve