Geely EC718, EC718RV, EC715, EC715RV. Manual part — 322

When turning the steering wheel, the steering shaft, together
with the steering control valve spool rotation, as transmitted by
the steering knuckle arm of the road turning resistance, power
cylinder piston and the rack can not be a temporary movement,
it turned to control valve and steering gear before they can
rotate with the shaft. In this way, transmitted by the steering
shaft torque steering control valve gear steering control valve
can only produce a little to reverse the deformation of the
torsion bar, so that, together with the steering shaft steering
control valve control valve spool to shift gears produce a
relatively small rotation, thereby steering control valve to the
side of power cylinder high-pressure chamber into the oil
chamber into the other side of the back cavity has become the
low-pressure oil chamber. The role of the high-powered
hydraulic cylinder piston force to help force the steering gear
steering control valve to the side of the mobile rack, and
steering control valve and steering gear shaft itself began to
rotate in the same direction. Continue as long as the steering
wheel rotation, the torsional deformation of torsion bar has
been unchanged, the role of steering control valve is also the
same help. Once the steering wheel to stop turning, power
cylinder side of the cavity of the high hydraulic forces
temporarily continue to exist, led to a shift control valve gear
continues to rotate, so that reduces the deformation of torsion
bars, until the torsion bar to return to its natural state. Steering
control valve back to the middle position, left and right power
cylinder interlinked, so that hydraulic power does not work. At
this point, steering wheel that is docked in a position without
moving, then the wheels to maintain a certain corner. If rotating
steering wheel, hydraulic power also play a role.

Power cylinder piston suffered a hydraulic pressure into linear
force to help the rack and move around, through the steering
horizontal rod to promote the steering knuckle and the wheels
turning.

Control Valve In the Middle

Pressure

Return

Valve Axle

Straight Position

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Control Valve Turning Left

Pressure

Return

Left Turn Position

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Control Valve Turning Right

Pressure

Return

Right Turn Position

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Steering System

Hydraulic Power Steering System

7-7

7.2.3.2 Power Steering Pump Assembly
Working Principle

Flow Control Orifice

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Power steering pump is a blade power steering pump and its
working principle is as shown in the graphic. The engine
rotating torque is delivered through the drive belt to the power
steering pump belt drive assembly and rotates the power
steering pump assembly drive shaft and the rotor. Blades
installed on the rotor are thrown out due to the centrifugal force,
rotate close to the pump ring (rear pump housing) wall, draw
the steering fluid from the fluid reservoir to the pump chamber,
and press the fluid through the flow control valve to the steering
gear, provide power steering hydraulic assistance.

Flow control valve regulates the steering gear fluid flow based
on the system fluid pressure. adjust the system fluid pressure.
Prevent the system hydraulic pressure being too high.

7-8

Hydraulic Power Steering System

Steering System

7.2.4 Component Locator
7.2.4.1 Component Locator

4

6

1

3

2

5

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Legend

1. Power Steering Gear and Rack Assembly
2. Power Steering Pump Assembly
3. Power Steering Inlet/Outlet Pipe/Hose Assembly (to

Steering Gear, Power Steering Pump)

4. Power Steering Inlet/Outlet Pipe/Hose Assembly (to

Power Steering Pump, Reservoir)

5. Power Steering Pipe with Fluid Reservoir Assembly
6. Power Steering Inlet/Outlet Pipe/Hose Assembly (to

Steering Gear, Reservoir)

Steering System

Hydraulic Power Steering System

7-9

7.2.5 Disassemble View
7.2.5.1 Disassemble View

7

6

5

1

2

3

4

8

9

10

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Legend

1. Power Steering Gear and Rack Assembly
2. Steering Dust Cover
3. Washer
4. Steering Dust Cover Liner
5. Power Steering Inlet/Outlet Pipe Assembly
6. Power Steering Inlet/Outlet Pipe Assembly (Fluid Inlet)

7. Power Steering Pipe with Fluid Reservoir Assembly
8. Fluid Reservoir Bracket
9. Power Steering Inlet/Outlet Pipe Assembly (Fluid Outlet)
10. Power Steering Pump Assembly

7-10

Hydraulic Power Steering System

Steering System