3) WHEN THE RCV LEVER IS IN THE FLOAT POSITION WHEN THE RCV LEVER IS IN THE FLOAT POSITION S1 40 S2 760F6WE05 В When the RCV lever (4, boom) is pushed further forward from the lower position, the pilot pressure reaches to 13~15bar, then the boom spool is moved to floating position. The work ports (A2), (B2) and the small chamber and the large chamber are connected to the return passage, so the boom will be lowered due to it's own weight. In this condition, when the bucket is in contact with the ground, it can be move up and down in accordance with the shape of the ground.
В В 6-6 13 12 28 PS RH 28 PS a2 a3 LS 3 T P a1 A1 B1 A2 B2 pst A3 B3 Floating Down Aux Bucket Boom 4 Joystick Dump 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 To MCV 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 3 12 28 PS RH 28 PS a3 LS A3 B3 a2 1 B1 A2 B2 pst Dump Down Floating Bucket back Roll Up Boom Aux