Volvo EC460B - Boom Up Operation

Boom up operation
1. Neutral
- Center passage open
- Holding valve closed
2. Joystick signal on(BU)
- Boom1 & Boom2 Spool move
- Center passge close & pressurize
3. Open load check
- Oil from parallel passage open load check.
4. Holding valve open and supply oil to cylinder
5. AI signal ON
- Boom2 spool returns to the neutral
Picture text:
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