Hydraulic System 5.7
Check valve (load retaining valve) • Boom cylinder base side. A pilot-operated load retaining valve is used to prevent spool leakage, which allows the cylinder to retain its home position. Raising the boom: The oil opens the check valve and flows to the boom cylinder base side. Lowering the boom: The oil is released by the piston and returns to the tank using the pilot-pressure line. This reduces the load on the check valve. This allows the base side oil to flow back using the check valve.
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Joystick control
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Boom base side
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4
5-14
918175/AP0605
