During use, screed operation fails, in order to be able to say that the cause of the fault clearing, the first work of its hydraulic.
The role of the valve is as follows:
(A) high and low pressure valve. Ensure screed lifting hopper opening and closing, when the throttle is in the high-pressure lifting work at low pressure does not work, the commutation diode controlled by the circuit in order to save energy.
(2) latching valve. Screed role is in the parking start 4 6 s inside, lock ~ fixed screed over 4 ~ 6 s unlock, start paving paving surface to ensure no serious indentation to improve pavement.
(3) unloading system. Screed unloading system consists of the following several valve consists of:
1) with check valve two valves. When unloading system to work, the one-way valve of this valve works to ensure that the fuel tank under high pressure oil chamber can be established;
2) Uninstall valve. When reversing, provide pressure regulator to unload oil;
3) two valves. When unloading system work to ensure that both sides of the hydraulic cylinder can work independently;
4) unloading valve. Actually reducing valve, is to stabilize the oil operating pressure
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