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HET4 > HET 4 DRIVELINE > Flashcards

HET 4 DRIVELINE Flashcards

DRIVELINE FUNDAMENTALS AND SERVICE 190401b

1
Q

Why is correct phasing of a driveline important?

A

Vibration free driveline

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2
Q

What tool is used to check for phasing?

A

inclinometer or bubble level

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3
Q

How accurate are inclinometers?

A

1/4 degree

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4
Q

What is the minimum degree needed for lubrication in a driveline?

A

1°

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5
Q

What is the preferred angle for lubrication of the driveline?

A

high driveline angle

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6
Q

When taking a bubble level scale reading from one u-joint yoke to the next, what condition is the driveline in if the readings are not 0 on both?

A

Tube could be twisted

Slip joint assembled incorrectly

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7
Q

What do the readings on the bubble scale level mean if they are zero on both universal joint yokes on the driveline?

A

Driveline is in PHASE

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8
Q

If the slip joint is installed 180° out of alignment, what would the phasing and balance be of the driveline?

A

Phasing would look correct but the balance would be out

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9
Q

If a driveshaft is angled down what type of degree does it have? (positive, zero or negative)

A

Positive dregree

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10
Q

If a driveshaft is level what degree does it have?

positive, zero or negative

A

Zero degree

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11
Q

Where should your inclinometer be placed when checking for phasing?

A

on a machined surface

the yoke is usually cast and might not be a good surface to take a reading from

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12
Q

When taking a reading on the driveline with a bubble level gauge, is it okay to move it any which way while switching which u-joint is being measured?

A

NO, same direction same way from each point

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13
Q

Why is driveline phase and yokes being parallel to each other important?

A

so no vibration is created and u-joints are able to spread lube

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14
Q

When measuring driveline, at what end of the vehicle should you start at?

A

the front of the vehicle (transmission output shaft)

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15
Q

If both readings of the angle of the driveshaft u-joint are positive, what should be done to the reading to find the working angle?

A

Subtract them from eachother

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16
Q

If one shaft u-joint slopes up and the other slopes down, what must be done to the angles to find the working angle?

A

Add them together

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17
Q

When are multiple drive shafts used?

A

Tandem Rear Axle
Long wheel base
Aux transmission - more gear selections

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18
Q

True or False?

Seals can handle and support the weight of the driveshaft?

A

FALSE

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19
Q

What should be done with exposed driveshafts, above the frame of the vehicle, in regards to safety?

A

Guards, shields

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20
Q

On a long single driveshaft what should be used to help support the load?

A

Midship bearing, steady bearing or center support

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21
Q

On what type of vehicles are single driveshafts used on?

A

Short-wheel based vehicles

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22
Q

Midship bearings are generally sealed or serviceable?

A

Sealed

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23
Q

What is the purpose of a slip joint on a driveshaft?

A

To handle change in length, caused by suspension travel

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24
Q

What is the basic purpose of the drivetrain?

A

To transmit power from the Drive member to the Driven member

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25
Q

What dictates the allowable limits in a drivetrain?

A

Manufacture spec, service manual

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26
Q

What can cause damage to the driveline tube?

A

Impacts from terrain, overloaded, high torque load

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27
Q

A bent/damaged driveline tube can be cause what symptom?

A

Vibration

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28
Q

To true the balance of a driveshaft what can be done?

A

Weights can be added to balance the driveshaft

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29
Q

Is it every allowable to have a driveshaft out by one tooth, in regards to phase?

A

Yes, engineered design - heavy torque loads

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30
Q

Is runout important on a driveline?

A

Yes, there very specific allowances for runout

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31
Q

Is the driveline balanced with or without both universal joins?

A

With u-joints

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32
Q

How are balancing weights mounted to the driveline?

A

Welded on

33
Q

Why do drivelines have speed ratings?

A

The max speed rating is what the driveline has been trued to on special machines

34
Q

Describe a trunnion on a u-joint?

A

Highly polished bearing surface, located at the end of each u-joint cross arm

35
Q

What is required on the bearing strap retaining fasteners?

A

Locking compound - manufacture spec

36
Q

What is inside the bearing cap of a u-joint?

A

Specific number of precision-ground needle bearings

37
Q

Why is greasing all four bearings caps/trunnions important on a driveline u-joints?

A

If any bearing cap is not receiving grease will fail prematurely

38
Q

The small amount of play between internal and external splines on a driveline are for what?

A

To allow grease/lube to get in between them

39
Q

If a driveline is well lubes and the slip joint has play up and down AND side to side, what condition is the slip joint in?

A

Failed, worn out

40
Q

If a slip joint is worn out what could be the operators complaint?

A

Vibration

41
Q

What are the three versions of Yokes?

A

Half round
Full round
Wing style

42
Q

What kind of fit should the cap and yoke bore have?

A

Interference fit

43
Q

What is most likely to be used with a centre support bearing?

A

Shims

44
Q

What is the maximum difference allowed in a parallel shaft arrangement?

A

1°

45
Q

What is the other name for a broken-back driveline arrangement?

A

intersecting angle

46
Q

What should be done before a visual inspection of driveline components?

A

Clean the area

47
Q

What types of damage can be seen on the splines of a split joint?

A

Twisted
Galling
Excessive movement/play

48
Q

A slip joint has too much play in the splines, what would be the complaint?

A

Vibration

49
Q

If a slip join has too much clearance in the splines what may have a premature failure?

A

U-joints

50
Q

What are some signs of lack of lubrication in a driveline?

A

False brinelling
Rust
Galling

51
Q

What can cause pitting in a u-joint?

A

Contaminated lubricant

52
Q

How should yoke bores and u-joint bearing surfaces be cleaned?

A

fine emery cloth

53
Q

What should technicians be aware of when removing u-joints?

A

The caps will become loose once the cross is removed, secure the caps to the trunnions

54
Q

Should u-joints be greased before or after install?

A

After

55
Q

Why is it important to install u-joints the correct way, with a press?

A

Brinelling can be caused by a bad install

56
Q

Driveline vibrations can be caused by a multitude of problems, what are some questions that should be asked before trying to find the fault?

A

When did the vibration start?
Was it gradual or sudden?
Were you loaded or empty?
What were the road conditions?
At what speed and RPM did it occur?
Did it happen during acceleration or deceleration?
Has the suspension or wheel base changed recently?

57
Q

What are the 5 steps to diagnose a driveline vibration?

A 
Gather Info
Road Test
Simulate Conditions
Record Findings
Stationary Inspection
58
Q

Who is the best person to check for the balance of a driveshaft?

A

A specialized driveshaft shop

59
Q

Stationary test of driveline are done in what position in the transmission?

A

Neutral

60
Q

What speeds should be gone through in a stationary test?

A

Idle to governed speed

61
Q

If a vehicle has a long wheelbase and multiple driveshafts, do you have to use midship bearings or is there another way to support the system?

A

To NOT use midship bearings, there would have to be multiple rear axles and/or auxiliary transmission, it would shorted then shafts helping with the weight

62
Q

For on-road application what is generally the largest allowable working angle in the drivetrain?

A

3°

63
Q

A brokeback drivetrain system has a positive angle of 3° at one end and a negative angle of 3° at the other end, what is the result?

A

They zero each other out

64
Q

What are the two ways to secure a yoke to a driveshaft tube?

A

Welded or slip (sleeve) that spline to the stub tube

65
Q

What are the arrows on a different parts of the driveline for?

A

To align the driveshaft - proper phasing

66
Q

How are the ends of a driveshaft tube mounted (stub shaft or tube yoke)?

A

Welded

67
Q

What does Air Ride Suspension do to our driveline angles?

A

Tries to keep the angle constant

68
Q

If a vehicle does not have air ride suspension, what could happen to the driveline angles as the vehicle is loaded and unloaded?

A

Angles will change with weight

69
Q

When removing drivelines, you should always follow all safety precautions. What should a technician be aware of when removing a driveline?

A

Non-destructive marking for alignment

70
Q

What types of u-joints eliminate pulsation in the driveshaft?

A

CV, double cardan, double universal

71
Q

What is the first visual indication of worn u-joints?

A

RUST

72
Q

What is used to connect a driveline at two components?

A

2 universal joints - parallel

73
Q

What type of driveline yokes are most commonly used in heavy equipment (off-road)?

A

Wing type

74
Q

What type of driveline yokes are used in heavy truck (on-road)?

A

Full or Half round yokes

75
Q

What can cause universal trunnions to have end galling?

A

Lack of lube or high working angle

76
Q

What attaches two yokes together?

A

U joints

77
Q

Why are alignment marks important on drivelines?

A

Manufacture spec may have the driveline out of phase

78
Q

How many bearing caps mount to a yoke?

A

2

HET4 (43 decks)

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