Hydraulic Assist Steering & Self Test

Front 1

Power steering pressure is highest when:

a) driving at high speed.

b) parking.

c) driving straight ahead.

d) driving around curves.

Back 1

b) parking.

Front 2

Most power steering systems are:

a) linkage type.

b) non-integral.

c) integral.

d) electric powered.

Back 2

c) integral

Front 3

Many power steering pump are:

a) vane type.

b) electrically driven.

c) low pressure pumps.

d) cam driven.

Back 3

a) vane type.

Front 4

Power steering gears should be overhauled:

a) if the steering system provides no assist.

b) only after ruling out other possibilities.

c) every time the pump is serviced.

d) if the system is noisy.

Back 4

b) only after ruling out other possibilities.

Front 5

A power steering system makes a buzzing sound at all times. The problem is most likely caused by:

a) a loose power steering pump belt.

b) air in the system.

c) excessive pressure in the system.

d) a defective steering gear.

Back 5

b) air in the system.

Front 6

The valve attached to the stub shaft on an integral power steering gear is called the:

a) flow control valve.

b) pressure relief valve.

c) steering assist valve.

d) directional control valve.

Back 6

d) directional control valve.

Front 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.

Back 7

a) delivers the same volume per revolution.

Front 8

High pressure develops in the power steering system when the:

a) directional control valve is centered.

b) flow control valve is open.

c) flow control valve is closed.

d) pressure relief valve is open.

Back 8

c) flow control valve is closed.

Front 9

The spool valve is centered in the valve body when:

a) no steering effort is being applied.

b) turning a corner.

c) driving straight ahead.

d) both a) and c)

Back 9

d) both a) and c)

Front 10

When servicing a rack and pinion power steering gear, the rack must be centered before disassembly because:

a) the steering wheel centre position must match the centre position of the rack.

b) the high spot must match the centre position of the steering wheel.

c) rack bearing adjustment is always made in the centre position.

d) the pinion cannot be reinstalled unless the rack is centred.

Back 10

a) the steering wheel centre position must match the centre position of the rack.

Front 11

When pressure testing a power steering system, the test pressure during hard turns in both directions is 1380 kPa (200psi), but the maximum pressure developed with the tester valve closed is 9200 kPa (1330 psi). Of the following, the most likely cause is a problem with the:

a) inlet check valve.

b) pressure relief valve.

c) directional control valve.

d) flow control valve.

Back 11

c) directional control valve.

Front 12

Inspection of a rack and pinion steering gear reveals four uniform grooves around the inside of the valve housing bore. The condition is caused by:

a) excessive pump pressure.

b) abrasive wear between the seals and the housing.

c) moisture in the fluid.

d) excessive tight turning.

Back 12

b) abrasive wear between the seals and the housing.

Front 13

Power steering pump operate by:

a) high centrifugal force.

b) pistons moving through cylinders.

c) changing the volumes of fluid cavities.

d) flexible fins on a rotating impeller.

Back 13

c) changing the volumes of fluid cavities.

Front 14

Poor power assist can be caused by:

a) an over-tightened pump belt.

b) overfilling the fluid reservoir.

c) a faulty flow control valve.

d) loose sector shaft bearings.

Back 14

c) a faulty flow control valve.

Front 15

High pressure develops in the power steering system any time:

a) the flow is restricted.

b) pressure relief valve is open.

c) the flow control valve is open.

d) either b) or c)

Back 15

a) the flow is restricted.

Front 16

The rack bearing adjustment on a rack and pinion power steering gear provides:

a) worm bearing preload.

b) sector shaft end play.

c) high spot adjustment.

d) rack to pinion mesh adjustment.

Back 16

d) rack to pinion mesh adjustment.

Front 17

When adjusting a recirculating ball type power steering gear, seating the adjuster plug and backing it off a prescribed amount provides:

a) thrust bearing adjustment.

b) rack bearing adjustment.

c) high spot adjustment.

d) sector shaft end play adjustment.

Back 17

a) thrust bearing adjustment.

Front 18

A power steering gear leaking internally produces:

a) squealing noises at the pump.

b) unequal assist pressures.

c) excessively high system pressures.

d) excessive heat build-up in the fluid.

Back 18

b) unequal assist pressures.

Front 19

In a rack and pinion power steering gear, the gear teeth are lubricated by:

a) power steering fluid.

b) applying lubricant during assembly.

c) filling the gear with lubricant after assembly.

d) permanently lubricated components.

Back 19

b) applying lubricant during assembly.

Front 20

When reassembling the directional control valve on a recirculating ball type power steering gear, the:

a) spool valve is indexed to the worm shaft.

b) worm shaft is indexed to the stub shaft.

c) stub shaft is indexed to the spool valve.

d) stub shaft is indexed to the worm shaft.

Back 20

c) stub shaft is indexed to the spool valve.

Front 21

When no steering effort is being applied to the steering wheel:

a) the flow control valve is always closed.

b) fluid pressure is high in the system.

c) the pressure relief valve is open.

d) fluid flows freely through the system.

Back 21

d) fluid flows freely through the system.

Front 22

On an integral power steering system, the power piston is located on the:

a) steering linkage

b) sector shaft

c) rack piston

d) stub shaft

Back 22

c) rack piston

Front 23

What is the purpose of Power Steering Systems?

Back 23

provide additional steering assist to the mechanical steering system.

Front 24

What are the types of Power Steering Systems?

Back 24

- Integral (linkage type) (12:1)

- Non-Integral (most RWD)

Front 25

What are the 2 configuration of rack and pinion power steering?

Back 25

- End Take-Off (most popular)

- Centre Take-Off (more serviceable)

Front 26

What is the purpose of a Power Steering Pump?

Back 26

provides a constant supply of hydraulic fluid to the power steering system.

Front 27

What are the types of Power Steering Pump?

Back 27

- Roller Type
- Vane Type
- Slipper Type
- Gear Type

Front 28

What does positive displacement pump mean?

Back 28

each revolution moves the same volume of fluid. At higher speeds, the pump produces proportionally more fluid volume.

Front 29

What are the valves in the Power Steering System?

Back 29

- directional control valve

- flow control valve

- pressure relief valve

Front 30

What are the typical power steering symptoms?

Back 30

- poor assist (loose belt / low fluid level)
- noises (loose belt / low fluid level, air in system producing buzzing noise)
- leaks
- jerky operation (shudder)
- no assist
- no assist in one direction