5) WHEN THE RCV LEVER IS IN THE ROLL BACK WHEN THE RCV LEVER IS IN THE ROLL BACK (retract) POSITION POSITION S1 40 S2 760F6WE07 В If the RCV lever (4, bucket) is pulled left, the bucket spool is moved to roll back position by pilot oil pressure from EH control block (40). The oil from main pump (1) flows into main control valve (3) and then goes to the large chamber of bucket cylinder. The oil at the chamber of bucket cylinder (13) returns to hydraulic tank (21). When this happens, the bucket roll back.
В В В 6-8 13 12 28 PS RH 28 PS a2 a3 LS 3 T P a1 A1 B1 A2 B2 pst A3 B3 Floating Aux Bucket Boom Dump 4 Joystick Down 5 9 Control unit Bucket Boom Aux back (Electro-Hydraulic & Joysick steering) Roll Up EH18 EH17 EH20 EH19 EH22 EH21 T P 4 1 6(4) 3(2) 5(3) 2(1) ( ) : 2 Spool b1 A2 B2 Regeneration To MCV check valve b2 LH b3 12 a3 b3 a1 b1 a2 b2 41 A1 Steering valve 27 27 10 (EHPS) EF port Steering valve (EHPS) LS port S1 X1 X2 P1 T 11 X3 Return line 28PS1 X1 X2 22 Return line ring system 23 B1 B2 24 25 21 S1 L2 L1 S2 L4L3 Fan & brake pump 12 28 PS RH 28 PS a3 LS A3 B3 A1 B a2 1 A2 B2 pst Dump Down Floating Bucket back Roll Up Boom Aux