Arm-IN operation
1. Neutral
- Holding condition
2. Joystick Arm-IN(AI) ON
- The Arm1 & Arm2 spool block center passage block
- Holding valve spool move to make holding valve free.
3. Load check open and return line is blocked by holding valve.
4. Holding valve open.
- Return line is restricted by arm regeneration valve when supplying pressure is low.
- Internal check open and return line is connecting to supply line.
5. When supplying pressure is high, arm regeneration valve make wide hole for return line to reduce back
pressure.
6. When using Boom-up at the same time.
- Center passge is blocked by boom1-spool
- Arm2 logic valve is closed by boom up signal.
Picture text:
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