Turn the hand-control directional valve A 不 and place it in the middle balance position; switch any one of three suspension supporting diverter valves (e.g. valve B) to the left position (or right position), and the corresponding cut-off valve b shall be closed. And then oil can be charged into four piston cavities; the normal oil charge pressure is 4Mpa, which can be presented on the pressure gauge of steering oil charge of the control box.
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