Deck 12: Power Steering Pumps

Question 1

Many belts today are made of EPDM.

Answer 1

True

Question 2

Increased steering effort may be the result of air in the power steering system.

Answer 2

True

Question 3

All of the following are true statements about ribbed stretchy belts EXCEPT:

A) A multi-ribbed belt may have an automatic belt tensioner
B) Stretchy belt is used to drive one components such as an air conditioning compressor
C) A special tool is required to guide the new belt onto the pulley
D) A stretchy belt appears similar to a multi-ribbed belt

Answer 3

A

Question 4

Technician A says when the front wheels are turned fully to the right or left, the pressure relief valve is open in the power steering pump. Technician B says when the front wheels are turned fully to the right or left, power steering pump pressure is very low. Who is correct?

A) A only
B) B only
C) Both A and B
D) Neither A nor B

Question 5

A fine-toothed file may be used to clean a sticking flow control valve.

Question 6

A power steering pump is being tested with a pressure gauge for maximum output pressure. Which of the following statements is correct?

A) The pressure gauge should be attached to the pump return port
B) The steering wheel should be held in the right lock position
C) A maximum output pressure dead heading test should last no longer than 5 seconds
D) One should check output pressure with engine speed above 4000 rpm

Question 7

Technician A says many car manufacturers recommend checking the power steering fluid level with the fluid warmed up. Technician B says many car manufacturers recommend checking the power steering fluid level with the front wheels turned fully in one direction. Who is correct?

A) A only
B) B only
C) Both A and B
D) Neither A nor B

Question 8

Technician A says a spring scale is used to measure steering effort. Technician B says excessive steering effort may be caused by a worn steering gear. Who is correct?

A) A only
B) B only
C) Both A and B
D) Neither A nor B

Question 9

A dial indicator may be used to measure power steering belt tension.

Question 10

All of the following statements about hybrid electric vehicles that have an electrohydraulic power steering pump EXCEPT:

A) A control module determines the amount of power assist required.
B) An electric motor drives the steering gear.
C) Some are sullied 42V from the HEV inverter.
D) The power steering pump has an electric driven motor.

Question 11

Power steering belt tension should be measured before testing power steering pump pressure.

Question 12

A loose power steering belt may cause belt squealing when cornering.

Question 13

A hydro-boost power steering system does not use a vacuum brake booster.

Question 14

Power steering pump pressure is highest when driving a vehicle straight ahead.

Question 15

A power steering system experiences repeated belt failures with normal power steering system operation. The most likely cause of this problem is:

A) A loose power steering pump belt.
B) Low fluid level in the power steering reservoir.
C) A worn cam ring in the power steering pump.
D) A misaligned power steering pump pulley.

Question 16

All of the following are true statements about multi-ribbed belts EXCEPT:

A) A multi-ribbed belt may have an automatic belt tensioner
B) A multi-ribbed belt may be used to drive all the belt-driven components
C) The back side of a multi-ribbed belt may drive a component on a serpentine application
D) A multi-ribbed belt drives only one component

Question 17

Excessive wear on the power steering pump mounting bolts may cause misalignment of the power steering belt.

Question 18

Rack and pinion steering gears are used mainly on rear-wheel drive cars.

Question 19

A press-on type power steering pump pulley may be installed by tapping on the pulley with a soft hammer.

Question 20

To bleed air from a power steering system with the engine running:

A) Loosen the high pressure hose at the gear
B) Loosen the return hose at the gear
C) Loosen the return hose at the pump
D) Turn the steering wheel fully in both directions

Question 21

The most likely result of a power steering drive-belt   that is worn is:

A) Belt contamination
B) Belt slipping
C) Wear on the power steering pump pulley
D) Belt breaking

Question 22

Technician A says that when testing power steering pump pressure, the pressure gauge should be connected in the power steering return hose. Technician B says if the power steering pump pressure is less than specified, the pressure relief valve may be sticking. Who is correct?

A) A only
B) B only
C) Both A and B
D) Neither A nor B

Question 23

A loose power steering belt may cause all of these problems EXCEPT:

A) Excessive wear on internal pump parts
B) Erratic steering effort
C) A squealing noise during acceleration
D) Low pump pressure

Question 24

When checking power steering belt tension by measuring the belt deflection, the maximum allowable belt deflection per foot of belt free span is:

A) 1/4 inch
B) 1/2 inch
C) 3/4 inch
D) 7/8 inch

Question 25

When testing power steering pump pressure, the pressure gauge valve should be closed for no more than:

A) 5 seconds
B) 30 seconds
C) 45 seconds
D) 60 seconds

Question 26

On a power steering pump with a variable assist steering actuator, what component controls the actuator:

A) Brake booster
B) Steering gear
C) Power steering cylinder
D) PCM

Question 27

All of these statements about a serpentine belt are true EXCEPT:

A) The back of a serpentine belt can drive one component.
B) A serpentine belt made of EPDM is susceptible to cracking.
C) A serpentine belt can have an automatic belt tensioner.
D) A serpentine belt can be used to drive all the belt-driven components.

Question 28

A hydroboost power steering system:

A) Has a conventional vacuum brake booster.
B) Has a very high capacity power steering pump.
C) Is used on many small front-wheel-drive vehicles.
D) Uses pressure from the power steering pump to provide brake boost.

Question 29

Many micro-V-belts use what type of automatic tensioner?

Question 30

Where is the machined venturi located in the power steering pump?

Question 31

A power steering pump has the specified pressure during a pressure test, but the steering effort measured with a spring scale is excessive. Technician A says to be sure the front tires have the specified tire pressure. Technician B says the power steering gear may be defective. Who is correct?

A) A only
B) B only
C) Both A and B
D) Neither A nor B

Question 32

A multi-ribbed belt with an automatic belt tensioner experiences rapid wear. Technician A says the most likely cause is a misaligned belt pulley. Technician B says the most likely cause is excessive belt tension. Who is correct?

A) A only
B) B only
C) Both A and B
D) Neither A nor B

Question 33

Technician A says foaming in the power steering reservoir may indicate air in the power steering system. Technician B says a growling noise when the front wheels are turned may indicate air in the power steering system. Who is correct?

A) A only
B) B only
C) Both A and B
D) Neither A nor B

Question 34

All of these statements about integral-type power steering pump sealing are true EXCEPT:

A) Lip seals are mounted on bolt fittings on the back of the reservoir.
B) The cap and dipstick provide a seal on the top of the reservoir neck.
C) A large O-ring seal is positioned between the reservoir and the pump housing.
D) A lip seal on the pump drive shaft prevents oil leaks around the shaft.

Question 35

A vehicle experiences repeated ruptures of the high-pressure power steering hose. The most likely cause of this problem is:

A) A flow control valve sticking open.
B) Worn pump vanes and cam ring.
C) A partially restricted power steering return hose.
D) A pressure relief ball sticking closed.

Question 36

Technician A says the same tool kit is used to remove and install a press-on-type power steering pump pulley. Technician B says power steering pump pulleys retained with a nut and lock washer have a woodruff key mounted in matching slots in the pulley and shaft. Who is correct?

A) A only
B) B only
C) Both A and B
D) Neither A nor B

Question 37

During normal power steering pump operation:

A) The fluid pressure from the outlet fitting venturi moves the flow control valve toward the open position.
B) Pump flow increases as the engine speed increases.
C) The pressure relief valve opens when the engine speed is increased with the front wheels straight ahead.
D) The flow control valve spring moves this valve toward the open position.

Question 38

All of these statements about power steering pump design and operation are true EXCEPT:

A) Fluid pressure from the pump vanes moves the flow control valve toward the closed position.
B) An increase in fluid movement through the outlet fitting venturi causes a pressure decrease in the venturi.
C) An increase in the flow control valve opening allows more fluid to return to the pump inlet.
D) The rotor is attached to the pump shaft and must rotate with this shaft.

Question 39

Technician A says erratic power steering pump pressure may be caused by a sticking flow control valve. Technician B says small metal burrs may be removed from the flow control valve with crocus cloth. Who is correct?

A) A only
B) B only
C) Both A and B
D) Neither A nor B

Question 40

All of the following statements about multi-ribbed belts made of EPDM are true EXCEPT:

A) EPDM belts are designed to last 50,000-60,000 miles.
B) Belts are designed to have clearance between the rib peaks and the pulley grooves.
C) EPDM belt to gradually lose material on the ribbing similar to the way a tire wears.
D) EPDM belt is more elastic than a standard neoprene belt and resists cracking even at higher mileage.

Question 41

When is the pressure relief ball in a power steering pump forced open?

Question 42

Explain two advantages of a micro-V-belt compared to a conventional V-belt.

Question 43

A power steering pump rotor may be sealed to the elliptical cam by what types of elements?

Question 44

Describe the procedure used to bleed air from the power steering system.

Question 45

What is the purpose of the vanes in the power steering pump rotor?

Question 46

With the engine running and the front wheels straight ahead, is the power steering pump pressure high or low?

Question 47

What happens to the pressure in the venturi as the fluid flow increases in the power steering pump?

Question 48

How is poor steering provided on hybrid electric vehicles when the engine is not running?

Question 49

Explain the type of vehicle that a hydro-boost power system is used on and the reasons for the use of this system.

Question 50

What can cause excessive belt wear?

Question 51

Explain the location and operation of a wear indicator on a multi-ribbed belt system.

Question 52

What type of fluid do most car manufacturers recommend in power steering systems?

Question 53

As the power steering pump shaft and rotor turn, what causes the vanes to move outward against the cam ring?

Question 54

Explain the forces that move the flow control valve toward the closed position in a power steering pump.