Unloader valve on PC 200-8 heavy equipment is a relief valve component that limits hydraulic pressure to 30 kg / cm2 when Neutral with the aim of speeding up the work of the cylinder when it is initially moved, unload valve damage can cause low power hydraulic systems on komatsu excavators.
When the control valve has been actuated, the LS pressure will help the spring unload valve pressure so that the pressure can rise according to the main relief setting.
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