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HET3 > 303Jb: Drive Axle & Carrier Fundamentals & Service > Flashcards

303Jb: Drive Axle & Carrier Fundamentals & Service Flashcards

1
Q

Drive Axle & Carrier Service

Housing joint leaks are generally contributed to faulty gaskets. (T/F)

A

False

Can leak due to loose fasteners, imperfections on sealing surfaces, or high tortion loads.

303Jb Pg. 4

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2
Q

Drive Axle & Carrier Service

As a maintenance concern for differentials, on which two shafts should the end play be checked?

a) Axle shaft
b) Input shaft
c) Output shaft
d) Pinion shaft

A

Input & output shafts

303Jb Pg. 6

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3
Q

Drive Axle & Carrier Service

When performing a road test, it was discovered that there was a noise that only occurred while cornering. The probable cause is:

a) Low lubricant level
b) Worn carrier thrust washers
c) Flat spots on the pinion and bevel gear teeth
d) Loose pinion bearings

A

b) Worn carrier thrust washers

303Jb Pg. 8

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4
Q

Drive Axle & Carrier Service

What check must be done before disassembling the differential carrier assembly?

a) Pinion bearing preload
b) Backlash
c) Input shaft preload
d) Pinion gear runout

A

b) Backlash

303Jb Pg. 13

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5
Q

Drive Axle & Carrier Service

Why must caution be used when removing the differential case half bolts?

A

If the carrier is equipped with a no-spin traction enhancing device, the case halves will be spring-loaded and longer bolts will have to be used to relieve the spring tension.

303Jb Pg. 16

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6
Q

Drive Axle & Carrier Service

Which components should always be changed in sets?

a) Bevel gear and pinion gear
b) Right and left axle shafts
c) Carrier pinion gears and bevel gear
d) Cross shaft and axle shafts

A

a) Bevel gear and pinion gear

303Jb Pg. 18

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7
Q

Drive Axle & Carrier Service

When the operator activates the driver-controlled carrier lock, the operator is mechanically locking:

a) Axle shafts together
b) Two case shafts together
c) Carrier pinions to the axle side gears
d) One axle shaft to the carrier case

A

d) One axle shaft to the carrier case

303Jb

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8
Q

Pinion bearing preload is established with:

a) Shims between the bearing cage and carrier housing
b) Threaded bearing adjusters
c) Different sized bearings
d) Shims between the pinion bearings

A

d) Shims between the pinion bearings.

303Jb Pg. 20

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9
Q

When checking pinion bearing preload using a cord and spring scale, record the reading required to start the assembly rolling. (T/F)

A

False

Record the torque while rolling and not the torque required to start the assembly rolling.

303Jb Pg. 20

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10
Q

The specific distance that the pinion and bevel gear are designed to run from each other is called:

a) Running distance
b) Nominal distance
c) Working distance
d) Specified distance

A

B) Nominal distance

303Jb Pg. 21

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11
Q

Side bearing preload and backlash adjustment is done with:

a) Shims between bearing cage and carrier housing
b) Threaded bearing adjusters
c) Different sized bearings
d) Shims between the pinion bearings

A

b) Threaded bearing adjusters

303Jb Pg. 27

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12
Q

When adjusting the backlash between the pinion and the bevel gear, if more backlash is required:

a) Adjust the flanged half adjuster CCW and the plain half adjuster CW by the same amount
b) Adjust the plain half adjuster CCW and the flanged half adjuster CW by the same amount

A

A) Adjust the flanged half adjuster counter-clockwise and the plain half adjuster clockwise the same amount

303Jb Pg. 27

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13
Q

If the tooth contact pattern shows excessive heel:

a) Move the pinion in and re-adjust the ring gear for proper backlash
b) Move the pinion out and re-adjust the ring gear for proper backlash
c) Move the ring gear towards the pinion
d) Move the ring gear away from the pinion

A

C) Move the ring gear toward the pinion.

303Jb Pg. 30

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14
Q

Differential Service

The two basic methods of carrier lubrication are:

A
  • Splash
  • Splash & Pressure

303Jb Pg. 2

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15
Q

A differential pressure lubrication pump is driven at what speed?

a) Fast
b) Overdrive
c) Constant
d) Steady

A

Overdrive

303Jb Pg. 3

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16
Q

When measuring pinion bearing preload, how should you read the spring scale?

A

Read the spring scale force while rolling and not the force required to start rotation.

303Jb Pg. 20

17
Q

What is used to help direct differential oil to bearings that are difficult to get splash oil lubrication to?

A

Troughs and Passages

303Jb Pg. 2

18
Q

What are common reasons for differential seals leaking?

A
  • Improper installation
  • Excessive endplay
  • Loose fasteners
  • Contamination
  • Excessive housing pressure

303Jb Pg. 4

19
Q

Durring an operation test of a differential, you notice noise on drive. What could be the cause?

A

Excessive pinion to ring gear backlash

303Jb Pg. 8

20
Q

Durring an operation test of a differential, you notice noise on coast. What could be the cause?

A

Pinion and ring gear too tight

303Jb Pg. 8

21
Q

Durring an operation test of a differential, you notice intermittent noise. What could be the cause?

A

Warped ring gear

303Jb Pg. 8

22
Q

Durring an operation test of a differential, you notice a constant noise. What could be the cause?

A

Flat spot of ring gear

303Jb Pg. 8

23
Q

Durring an operation test of a differential, you notice a noise on turns. What could be the cause?

A

Worn carrier side gears and pinions

303Jb Pg. 8

24
Q

The normal operating temperature of the drive axle is about:

A

160F - 220F

303Jb Pg. 9

25
Q

What could result in drive axle overheating?

A
  • Axle housing covered in mud
  • Low oil level
  • Improper oil type
  • Improper oil viscosity

303Jb Pg. 9

26
Q

A differential pinion with an etch number of +3 indicates what?

a) A 0.003” gap between end of pinion and side of carrier
B) Should be located at 0.003” less than nominal dimension
c) Should be located at 0.003” more than nominal dimension
d) Match mark corresponding to it’s mated crown gear

A

C) Should be located 0.003” more than nominal dimension

303Jb Pg. 22

27
Q

A differential pinion with an etch number of -4 indicates what?

a) A 0.004” gap between end of pinion and side of carrier
B) Should be mounted at 0.004” less than nominal dimension
c) Should be mounted at 0.004” more than nominal dimension
d) Match mark corresponding to it’s mated crown gear

A

B) Should be mounted at 0.004” less than nominal dimension

303Jb Pg. 22

28
Q

What tooth contact pattern is shown and what adjustment would correct it?

A

Correct tooth contact patern

303Jb Pg. 30

29
Q

What tooth contact pattern is shown and what adjustment would correct it?

A

Excessive Face

Move pinion in and re-adjust ring gear backlash

303Jb Pg. 30

30
Q

What tooth contact pattern is shown and what adjustment would correct it?

A

Excessive Flank

Move pinion out and re-adjust ring gear backlash

303Jb Pg. 30

31
Q

What tooth contact pattern is shown and what adjustment would correct it?

A

Excessive Heel

Move ring gear towards pinion (decrease backlash)

303Jb Pg. 30

32
Q

What tooth contact pattern is shown and what adjustment would correct it?

A

Excessive Toe

Move ring gear away from pinion (increase backlash)

303Jb Pg. 30

HET3 (36 decks)

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