3. WORK EQUIPMENT HYDRAULIC CIRCUIT 14 13 P 3 4 4' Aux Bucket Boom Joystick LS 5 Control unit (Electro-Hydraulic & Joysick steering) Pst EH18 EH17 EH20 EH19 EH22 EH21 T 6 T P 4 1 6(4) 3(2) 5(3) 2(1) ( ) :
2 Spool To MCV b2 b1 b3 a3 b3 a1 b1 a2 b2 Steering valve (EHPS) EF port 28 28 11 A1 Steering valve (EHPS) LS port 12 P1 X1 X2 S1 T Return line X3 29 X1 X2 PS 1 23 Return line Steering system B1 B2 25 24 22 26 L1 L2 S1 S2 L3 L4 Fan & brake pump 757F6WE02 1 Main pump 3 Main control valve 4 Remote control valve (EH type) 4' Remote control valve (FNR type, opt) 5 Control unit 6 EH control block 11 Safety valve 12 Shuttle valve 13 Boom cylinder 14 Bucket cylinder 22 Hydraulic tank 23 Air breather 24 Return filter 25 Bypass valve 26 Strainer 28 Check valve 29 Pressure sensor 40 Boom lowering valve 6-4 LH 40 a1 a2 A1 B1 A2 LH RH 29 PS PS 29 a3 B2 A3 B3 Dump Bucket Floating Down Boom Aux Roll back Up Up