a pressure signal to the pilot valve Ls opening to enable the
pilot valve rod operate. When the pilot valve P opening is
connected with CF opening, the high-pressure oil flows to
the steering gear, passes through the valve element passage
in the steering gear, to the steering gear L opening or R
opening, and to the steering cylinder. The big cavity of the
left steering cylinder is connected with the small cavity of
the right steering cylinder, and the small cavity of the left
steering cylinder is connected with the large cavity of the
right steering cylinder. Both oil cylinders operate jointly to
drive the front wheels. When the steering wheel moves
slowly or does not operate, most of the hydraulic oil from the
steering pump returns to the tank via the pilot valve EF
opening. The pilot valve T opening is connected with the oil
return opening of the hydraulic oil tank. The steering gear
has following five oil openings: P, R, L, Ls and T. P opening
and Ls opening are connected with corresponding openings
of the pilot valve and are not described again herein. When
the steering wheel rotates rightwards, R opening outputs high
pressure. R opening is connected with the rod cavity of the
right steering cylinder (the rodless cavity of the left steering
cylinder). L opening is connected with the rod cavity of the
left steering cylinder (the rodless cavity of the right steering).
The steering gear T opening is connected with the oil return
opening of the hydraulic oil tank.
3) Full-hydraulic steering system maintenance
a. Check the oil level in the hydraulic oil tank: First,
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