300.9D VPS Mini Hydraulic Excavator Machine Systems Stick Hydraulic System Caterpillar


Stick Hydraulic System
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1.1. STICK IN
2.1. STICK OUT


Illustration 1g06015403
Partial hydraulic schematic (STICK IN)
(1) Stick cylinder
(2) Main control valve
(3) Relief valve (outer pump)
(4) Stick control valve
(5) Hydraulic pump
(6) Hydraulic tank
(13) HPU changeover valve

STICK IN



Illustration 2g02463176
Stick control valve (STICK IN)
(7) Cylinder port A
(8) Cylinder port B
(9) Return passage
(10) Spool
(11) Center bypass passage
(12) Parallel feeder passage

Spool (10) has a mechanical linkage which actuates the valve. When the linkage is pulled, spool (10) shifts upward. The pump oil then flows to cylinder port A (7). The oil flows through lines to the head end of the stick cylinder to extend the cylinder rod. Return oil in cylinder port B (8) flows through the spool to return passage (9). The oil then returns to the tank.

STICK OUT



Illustration 3g02463197
Stick control valve (STICK OUT)
(7) Cylinder port A
(8) Cylinder port B
(9) Return passage
(10) Spool
(11) Center bypass passage
(12) Parallel feeder passage

Spool (10) has a mechanical linkage which actuates the valve. When the linkage is pushed, spool (10) shifts downward. The pump oil then flows to cylinder port B (8). The oil flows through lines to the rod end of the stick cylinder to retract the cylinder rod. Return oil in cylinder port A (7) flows through the spool to return passage (9). The oil then returns to the tank.

Refer to the Systems Operation, "Main Control Valve" for more information on the main control valve and the stick control valve.

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