PURPOSE: providing booster is effectively performed load work immediately, because the main control valve released stress heavy material or batholith when drivers' cab loads at random can be risen. CONSTITUTION: a kind of work of the main control valve of valve (4) is by control pressure fluid in addition to spring (41). Main control valve be connected to helical plumber block (2) provide control pressure fluid, upper end remote control device valve (1) be connected to control switch (11) control solenoid valve. Therefore, in normal work, whether hydraulic system be not the low of the pressure main control valve for or not Tai Ji end by holding pressure reducing valve, and user optionally enhances the main control valve released stress, so that loading work is effectively performed, when load weight or rock.
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