1) WHEN THE RCV LEVER IS IN THE RAISE POSITION Steering unit P port 3 Steering unit LS port SX P Pst T b1 b3 b2 4 B.D/F B.U CRAWD DUMP 1 3 4 2 P T 1.1 2.1 A1 7 P1 T Cut off valve P1 port Return line 24 X1 PS 1 18 Return line B1 E/G L L1 S1 17 74096WE03 В When the RCV lever (4) is pulled back, the boom spool is moved to raise position by pilot oil pressure from port 3 of RCV. The oil from main pump (1) flows into main control valve (3) and then goes to the large chamber of boom cylinder (8) by pushing the load check valve of the boom spool. The oil from the small chamber of boom cylinder (8) returns to hydraulic oil tank (17) through the boom spool at the same time.
When this happens, the boom goes up. В В В 6-5 8 LH A2 ( ) ) ( ( ) Floating Dump Down )( Rollback Up Floating own Up D