4. TRAVEL SPEED CONTROL 4.
TRAVEL SPEED CONTROL SYSTEM SYSTEM ARM CYLINDER BUCKET CYLINDER BOOM CYLINDER SWING MOTOR ps1 ps2 T3 T1 T2 T4 pa10 TRAVEL MOTOR B9 A9 RH LH Dr Ps Ps Dr ARM 2 pa9 B8 pb9 MB REG MA MB REG MA BUCKET pb8 A8 DR2 pa8 pc2 DR2' VA(BW) VB(FW) VA(FW) VB(BW) pb7 B7 A7 C A B D G F E BOOM 1 DR4 pa7 pc7 B6 pb6 pa6 A6 TRAVEL P T P2 PH PA PP PT P1 PS P3 PS pb6 pa1 pb1 pa6 (2) (1) (4) (3) BOOM P T BUCKET ARM P T SWING T1 T2 T3 PUMP A1 PUMP A2 PILOT PUMP (2) (1) (3) (4) (2) (3) (1) (4) TRAVEL SPEED SOLENOID VALVE P T dr# A D E F G H J B PH (MCV) F (T/JOINT) a b d e f g h j pa2 pb2 PS c h1 j1 PS PS d1 f1 g1 PS PS PS e2 PS A1 A2 A5 P3 P4 Pi(D/C VALVE) PP(MCV) Td# P pb9 pb5 T A B C (Td#) P2 P1 P(2-EPPR) HYDRAULIC TANK pa9 pc1 pa5 pa8 pa11 pb8 pc6 pb3 pb7 pc2 pa7 pa3 LINE FILTER 480A3HC05 When the travel speed solenoid valve was placed in the Hi position, the pressure oil from pilot pump through line filter flows to port Ps Ps of travel speed change over valve, and the control piston is pushed up, thus minimizing the displacement.
When the travel speed solenoid valve was placed in the Lo position, the oil of Ps Ps port return to the tank and the control piston is returned, thus maximizing the displacement. 3-10 A5 pb5 ARM 1 pa5 B4 A4 pb4 pa4 OPTION TRAVEL(LH TRAVEL STRAIGHT CROSS ASS P1 P2 P3