HYDRAULIC SYSTEM
ME12002
Lowering the Dipper Arm Cylinder (with light loads)
Figure 3-136 Lowering the Dipper Arm Cylinder (with light loads) After the dipper arm begins excavating, pressure within the head side of arm cylinder (1) increases and presses piston (37) and sub-spool assembly (38) to the right against spring (41). Path (40) opens and most of the return flow from the rod side of arm cylinder (1) flows through arm 1 spool (302), path (40), return path (17) and return path (27) into the tank (the return flow does not flow into the regeneration circuit). See Figure 3-136 and Figure 3-137.
Figure 3-137 Dipper Arm Control For a larger view of Figure 3-137, see Figure 3-128 on page 128.
909768/BP1207
132
Printed in U.S.A
