When the general grader works, it will reverse the flow of oil, and recommend a good machine to avoid this problem.
I used the national heavy industry P Y 180 grader, has not encountered this situation.
PY 180 closed pressure tank, equipped with exhaust valve, which can control the pressure of the tank is 0.07 MP a, to help the work unit oil pump and steering pump normal oil absorption.
Should be the cylinder and scraper motor, there is no set of two-way hydraulic locks, so the oil cylinder or hydraulic motor into the oil cavity and reversing valve into the "middle" when the oil flow back.
