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HET4 > 401A: Clutch Fundamentals and Service > Flashcards

401A: Clutch Fundamentals and Service Flashcards

190401A CLUTCH

1
Q

Spring loaded clutches have three styles of spring, what are they?

A

Perpendicular, diaphragm and angle

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2
Q

What are the two types of spring clutches?

A

Push and Pull type

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3
Q

When the operator pushes the clutch pedal to the floorboard, is the clutch engaged or disengaged?

A

Disengaged

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4
Q

The springs in the clutch are naturally in the engage or disengaged position?

A

Engaged

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5
Q

Where are the pressure springs usually located?

A

Between the clutch cover and pressure plate

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6
Q

When a spring-loaded clutch is engaged what happens to the clutch disc, pressure plate and flywheel friction surface?

A

The clutch disc is held tightly between the pressure plate and flywheel friction surfaces

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7
Q

What dictates a clutch as a PUSH or PULL type?

A

The direction the release bearing is moved to release the clutch

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8
Q

Heavy duty vehicles use what type of clutch?

A

Pull type

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9
Q

The release bearing pushes or pulls on what component within the clutch?

A

Release levers

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10
Q

When the clutch disc is disengaged what moves together?

A

Clutch cover/pressure plate assembly rotates with the flywheel

Clutch discs rotates with the transmission input shaft

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11
Q

When a clutch is getting ridden a lot what will wear?

a) flywheel
b) clutch disc
c) friction material
d) pressure plate

A

c) The clutch friction material - lining

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12
Q

When a spring has to travel further what happens to its pressure application ability?

A

it gets weaker

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13
Q

Does clutch pedal free play become more or less when the clutch is worn severely?

A

Less free play

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14
Q

What are two things that dictate if the clutch is a push or pull type?

A

Release bearing travel and release levers travel

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15
Q

What are the four ways to find the size of a clutch?

A
  • Diameter of the disc
  • Outside diameter of the clutch shaft
  • Number of splines in the hub
  • Number of dampening springs
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16
Q

What are two types of flywheels?

A

Flat and Countersunk

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17
Q

When an operator releases the pedal, what position is the clutch in?

A

Engaged

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18
Q

What are the actuation mechanisms used for clutches?

A
  • Mechanical linkage
  • Hydraulic
  • Air
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19
Q

In a vehicle where the transmission/engine are VERY far from the operator pedal, what actuation mechanism is used?

A

Hydraulic
or
Air over Hydraulic

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20
Q

If the engine/transmission is close to the operators clutch pedal, what actuation mechanism is most likely to be used?

A

Mechanical Linkage

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21
Q

If a clutch pedal linked to a mechanical linkage has lots of free play but the clutch is adjusted correctly, what is cause?

A

The bearings, rod end and/or bushings in the linkage are worn

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22
Q

Out of the three clutch actuation mechanisms, which is the least expensive?

A

Mechanical linkage

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23
Q

If there are air bubbles in the hydraulic clutch system, what is the operators complaint?

A

Spongy pedal

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24
Q

If a clutch pedal has excessive side to side movement, what should a tech be looking for as the cause?

A

Worn bushings in the pedal linkage

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25
Q

What are basic inspections on a hydraulic clutch that a technician can do?

A

Check lines for damage and wear
Check for leaks
Pedal movement/feel
Reservoir level and fluid condition

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26
Q

When installing a new master cylinder in a hydraulic clutch assembly what should be done FIRST?

A

Bench bleed the master cylinder

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27
Q

A rod end link is considered failed when what movement is felt?

A

The ball can move separately from the socket

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28
Q

In an air over hydraulic clutch mechanism, which one is used for the control and which one is used as the assist?

A

Hydraulic - Control
Air - Assist

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29
Q

What drives the intermediate plate in a system with a countersunk flywheel system?

A

Flywheel

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30
Q

What is the purpose of an intermediate plate?

A

Additional friction surface when using multiple friction discs

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31
Q

Where are rigid clutches used? What type of application?

A

Where there is a limited amount of engagement and disengagement

32
Q

Are dampened clutch discs considered flexible or rigid?

A

Flexible

33
Q

What is used on a dampened clutch disc to absorb torsional shock loads?

A

A spring-loaded, limited-movement mechanism

34
Q

What do dampened clutch discs do to the service life of the clutch?

A

Extend clutch service life

35
Q

What are the two types of clutch disc linings materials?

A

Organic and Ceramic

36
Q

What clutch disc lining should be used where high heat will be encountered?

A

Ceramic

37
Q

An intermediate plate is used when?

A

Two clutch discs are used

38
Q

What component helps stop intermediate plate vibrations and reduce noise?

A

Anti-rattle springs

39
Q

How is the intermediate plate coupled to the clutch cover?

A

Drive Straps
Drive Slots

40
Q

A clutch that sounds like it is “rattling” when engaged could be a result of?

A

A broken dampening springs in the clutch disc

41
Q

A clutch is starting to feel like its causing hard shifts, what could be the cause?

A

Broken dampening springs in the clutch disc

42
Q

How much gap should there be between the yoke and release bearing?

A

1/8”

43
Q

Operator complains the clutch is feeling stiff or harder, what could be the cause?

A

Worn clutch disc

44
Q

What generally causes premature failures of transmissions and clutches?

A

Abuse from operator

45
Q

What can cause a failure of a self-adjuster in the clutch?

A

Contamination - tiny teeth

46
Q

Which type of clutch can have an internal threaded ring that you must unlock first before adjusting the clutch?

A

Pull-type, manualy adjusted clutch

47
Q

When does a clutch brake activate?

A

When the clutch pedal is fully depressed.

When the operator is shifting from neutral to first or reverse gear

48
Q

What does a clutch brake prevent?

A

Gear teeth clash during gear selection

49
Q

What is the purpose of the clutch brake?

A

To stop rotation of the transmission input shaft

50
Q

True or False

The release bearing pushes up against the clutch brake when the clutch is disengaged.

A

True

51
Q

At what point in clutch pedal travel should the clutch brake activate?

A

1/2”-1” from the floor (bottom of travel)

52
Q

What can cause premature failure of the clutch brake?

A

contamination, improper use

53
Q

Operator complains the truck is hard to get into 1st gear and reverse gear, what could be the cause?

A

Failed clutch brake

54
Q

What is considered improper use of the clutch brake?

A

Engaging the clutch brake while traveling in 2-6th gear

55
Q

If a clutch brake is able to slip, what will happen to service life of the component?

A

service life will be extended

56
Q

What will prolong clutch service life?

A

regular inspection, adjustment, keep clean

57
Q

Lubrication contamination of the clutch lining could give what symptom?

A

Chatteringing during engagement and disengagement

58
Q

A glazed clutch disc that is worn in an unusual pattern could be caused by?

A

Lubrication contamination

59
Q

What should be used when moving the heavy clutch assembly away from the engine?

A

Two Long Guide Studs

60
Q

What should be used to help control the clutch discs while the clutch is installed?

A

Clutch disc aligning tool

61
Q

What must be done before setting the clutch free pedal?

A

Check all of the external linkage for wear and signs of binding, must be properly lubricated

62
Q

To check the flywheel bore runout, what position does the dial-indicator need to be in?

A

90° to the surface

63
Q

Why should you check crankshaft end play more than once?

A

To squeeze out oil film, giving a more accurate reading

64
Q

What should never be used to clean clutch components?

A

Grease, oil based products, varsol

65
Q

An operator complains the clutch feels like it is dragging/grabbing. What could be the cause?

A

Flywheel face runout is beyond specs

66
Q

What two forces do centrifugal clutches utilize?

A

Centrifugal force
Friction Force

67
Q

What could cause a centrifugal force clutch to stay engaged?

A

Release/return springs have failed

68
Q

Which component is spring controlled in a centrifugal force clutch?

A

Friction shoes

69
Q

In what applications would a rigid clutch disc be used?

A

Where limited amount of engagement and disengagement occur

70
Q

Push type clutches are usually used on what class of vehicle?

A

light-medium duty

71
Q

What causes the MOST wear to a clutch friction disc?

A

Clutch slippage

72
Q

The springs inside a clutch friction disc are called what?

A

Torsion Dampening springs

73
Q

What are the two design types of clutch covers?

A

Cast Iron:
-Heavy duty use

Stamped Steel:
-High speed & light duty use

401A Pg. 12

74
Q

What are the advantages of cast iron clutch covers?

A

Handles high heat and high torque loads

401A Pg. 12

75
Q

What are advantages of the stamped steel clutch covers?

A

Lighter design and allow for higher engine speeds

401A Pg. 12

HET4 (44 decks)

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