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10 Structure and function
Solenoid valve
A2: To swing motor port B
A3: To center swivel joint port G1
A5: To control valve port PT
T: To hydraulic tank
ACC: To accumulator (for PPC circuit)
1. PPC lock solenoid valve
2. 2nd travel speed selector solenoid valve
3. Swing parking brake solenoid valve
4. Merge-divider solenoid valve
Check valve
5. Plug
6. Plunger
Solenoid valve
7. Coil (ON/OFF type)
8. Push pin
9. Valve spool
10. Sleeve
11. Stopper
12. Body
Operation
(PC88MR-PQPT-044-K-00-A)
Operation of check valve
This valve is installed between port (P) and PPC solenoid valve. When the engine is stopped, the reaction
force of spring (2) pushes plunger (1) to the left and port (ACC) and port (P) is disconnected, thus the
accumulated pressure in the accumulator is held.
When the engine is running, the pilot pressure in port (P) pushes plunger (1) to the right, and between port
(P) and port (ACC) are interconnected.
10-148
PC88MR-10
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