31 - 10
Operation (cont’d)
3. Swing Spool Switch (Refer to Fig.1, 2, 8)
When the pilot port 5Pb1 (5Pa1) is pressurised and the
swing spool is selected (Fig. 8), the 4-spool neutral passage
(A) is cut off and the oil delivered from port 5P flows through
the 4-spool parallel passage (B), pushes open the load
check valve (17) and flows through passage (F) and the
spool neck to cylinder port 5B1 (5A1).
The return oil from port 5A1 (5B1) flows from the swing spool
neck to the tank passage.
Section E Hydraulics
9803/6020
Section E
31 - 10
Issue 1
Control Valve
Fig. 8
289820
A
B
A Swing
B To Arm Section
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