S0709455K
Page 6
Main Control Valve (Toshiba)
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OPERATION
NEUTRAL
When the spools of the bucket section and the boom section are in neutral, both the cylinder ports A (rod
side) and B (tail side) are closed by the spools.
The pressure oil which has reached the control valve flows through the inlet section, past the neutral oil
passages in the bucket section and the boom section to the outlet section from which it is directed to the
low-pressure oil passage and leaves the control valve through the exhaust port of the inlet section.
BUCKET/OPTION SPOOL OPERATION
When the bucket spool moves in the direction indicated by the arrow
The neutral oil passage is closed by the spool and the pressure oil pushes open the load check valve to
flow to the cylinder port (A1) from which it is directed into the bucket cylinder rod side.
The oil discharged from the bucket cylinder tail side flows through the cylinder port (B1) to the low pressure
oil passage.
Figure 3 OPERATION IN BUCKET/OPTION
Reference
Number
Description
1 Load Check
2 Port A1
3 Port B1
4 Tank Passage
5 Center By-pass Passage
Reference
Number
Description
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