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10 Structure, function and maintenance standard
Boom regeneration circuit
1.
If the cylinder head pressure is lower than the bottom pressure (free fall, etc.)
1.
Hydraulic pump
2.
Boom spool
3.
Pressure compensation valve
4.
Safety-suction valve
5.
Suction valve
6.
Check valve
7.
LS shuttle valve
Function
q
Provides the regeneration circuit from the cyl-
inder bottom to the cylinder head when the
boom is lowered and increases flow to the cyl-
inder bottom.
PC300, 350-8
Operation
q
If the cylinder head pressure is lower than the
bottom pressure, pressurized oil (A) from the
cylinder bottom flows to drain circuit (B) from
the notch of boom spool (2).
q
On the other hand, remaining oil flows to
regeneration circuit (C), opens check valve (6)
and flows to the cylinder head via circuit (D).
q
Flow from regeneration circuit (C) and pump
(1) merges in circuit (E).
SEN01994-01
29
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Troubleshooting
