Hydraulic Assist Steering

Question 1

Steering assist is provided by:

a) a hydraulic pressure difference
b) a vacuum pump
c) a rotary motion of the flow control valve
d) a recirculating ball nut

Answer 1

a) a hydraulic pressure difference

Question 2

List two (2) configurations of rack and pinion steering gears

Answer 2

a) end take off

b) centre take off

Question 3

On rack and pinion steering gears, variable ratio is accomplished by changing the:

a) sector shaft teeth
b) rack gear teeth
c) pinion gear teeth
d) ball nut teeth

Answer 3

b) rack gear teeth

Question 4

The rack gear and inner tie rods are protected by the:

a) pinion cover
b) flow control valve
c) ball nut
d) bellows boots

Answer 4

d) bellows boots

Question 5

Name four (4) designs of hydraulic assist pumps

Answer 5

a) vane pump
b) roller pump
c) slipper pump
d) gear pump

Question 6

What are the three (3) common properties of hydraulic assist pumps?

Answer 6

a) a positive displacement
b) demand
c) balanced

Question 7

Positive displacement means that the pump:

a) delivers the same volume per revolution
b) always delivers the same pressure
c) delivers more pressure at higher speed
d) always delivers the same flow

Answer 7

a) delivers the same volume per revolution

Question 8

Pressure is created by a ____________

Answer 8

Restriction

Question 9

The flow control valve is designed to:

a) direct the fluid to the desired turn chamber
b) control system pressure
c) regulate fluid flow
d) regulate system pressure

Answer 9

c) regulate fluid flow

Question 10

Electromechanical assist pumps do not require a:

a) flow control valve
b) pressure relief valve
c) directional control valve
d) power steering assist valve

Answer 10

a) flow control valve

Question 11

List the two (2) components that make up a directional control valve

Answer 11

a) spool valve

b) valve body

Question 12

the directional control valve components are held in alignment by the:

a) worm shaft
b) stub shaft
c) torsion bar
d) pinion gear

Answer 12

c) torsion bar

Question 13

When the directional control valve is in alignment, the pressure in the turn chambers are equal

a) true
b) false

Answer 13

a) true

Question 14

When the directional control valve is misaligned, the pressure in the turn chambers are equal

a) true
b) false

Answer 14

b) false

Question 15

In order for the directional control valve to be aligned, the steering wheel must be in the straight ahead position

a) true
b) false

Answer 15

b) false

Question 16

Variable assist steering provides full assist at __________ speeds.

Answer 16

parking lot

Question 17

List the two (2) adjustments in order on a non-rack and pinion steering gear.

Answer 17

a) worm bearing preload

b) high spot / over centre mesh

Question 18

List the two (2) items you have to check before you use the steering system analyzer

Answer 18

a) fluid

b) the drive system

Question 19

Closing the valve on the steering system analyzer three times and noting the pressure readings is a test for what component?

a) directional control valve
b) pressure relief valve
c) flow control valve
d) power piston seal

Answer 19

b) pressure relief valve

Question 20

Manually flushing a hydraulic steering system should be done with the engine running

a) true
b) false

Answer 20

b) false