190303Ja

Question 1

Unsprung weight refers to?

Answer 1

axles, tires and rims, brakes, differentials (underneath frame)

Question 2

a rear axle needs to be able to handle what weight?

Hint: Haul trucks, articulated trucks

Answer 2

The weight of the bucket being tipped up, when unloading

Question 3

What is a Bogie axle?

Answer 3

Oscillating axle to keep ground contact

Question 4

What causes wheel speed differences?

Answer 4

Different size tires, uneven ground, turning, slippage

Question 5

How can traction control devices be activated?

Answer 5

Operator controlled, automatically applied

Question 6

Are carrier housings (pumpkin) generally removable?

Answer 6

Yes, some may not be

Question 7

Full floating axle shafts are equipped on?

Answer 7

On long haul trucks (3/4T and up). *All weight is supported by bearings that support axle housing and wheel assembly** Outboard final drives

Question 8

Semi-Floating axles are used on?

Answer 8

Small automotive vehicles, carries some of the weight of the machine. There are some on heavy duty equipment

Question 9

What is on a straddle mount pinion gear?

Answer 9

A 3rd bearing to help support

Question 10

Axle housing thickness depends on?

Answer 10

GAWR

Question 11

Selective spacer does what?

Answer 11

Determine or adjust bearing preload. *On a pinion

Question 12

Shim pack affect?

Answer 12

Pinion gear depth into bevel gear

Question 13

Describe an overhung mount pinion

Answer 13

Two tapered bearings are used wit a selective spacer to support pinion. Wearker option compared to straddle type

Question 14

Is overhung or straddle type pinion mount the strongest?

Answer 14

Straddle type is strongest, prevents deflection away from bevel gear

Question 15

Bevel gear can also be known as?

Answer 15

Ring or Crown

Question 16

Why is a bevel and pinion gear preferred on what type equipment?

Answer 16

On equipment that travels forwards and backwards evenly, the pinion being in the center line of the crown gear allows the pinion to handle torque forwards and backwards evenly while give the shaft better ground clearance

Question 17

Axle side gears are always meshed with?

Answer 17

Pinion gears

Question 18

What do pinion and side gears must have?

Answer 18

Thrust washers

Question 19

What is a cross shaft sometimes called?

Answer 19

Spider

Question 20

What are the two halves of a different case?

Answer 20

Plain case half and flanged case half

Question 21

True or False: Torque will always be delivered in the same amount to each wheel from the differential

Answer 21

True

Question 22

True or False: Tire pressure, size and wear do not affect stress and wear on differential gears

Answer 22

False

Question 23

What causes axle housing failures?

Answer 23

Normal wear and tare during normal conditions, excess wear is caused from shock loading or over loading the equipment.

Question 24

What does the drive axle assembly must do to direction?

Answer 24

change the path of power by 90 degrees

Question 25

In an open diff how is torque divided to each axle shaft?

Answer 25

even through the gear ratio, but amount can depend on traction

Question 26

What does torque work directly against?

Hint: good traction vs bad traction

Answer 26

Resistance in the wheel

Question 27

If a pinion gear has no etched number in it what does it mean?

Answer 27

It is at zero, does not need to be adjusted with shims

Question 28

Speed is different in torque through a differential in what way?

Answer 28

Speed cannot be lost

Question 29

If tire scuffing is occurring during turns, what should be inspected?

Answer 29

The differential

Question 30

What can a transfer case also be called as?

Answer 30

Transfer Gear

Question 31

What works with a transfer case to split torque equally between front and rear drive shafts?

Answer 31

Standard or planetary inter-axle differentials

Question 32

What type of interaxle differential allows for speed differences in drive shafts?

Answer 32

Planetary interaxle differentials

Question 33

True or false: The planetary interaxle differential has an internal (ring) gear.

Answer 33

FALSE

Question 34

How many diffs can be locked on a vehicle with three axles with differentials?

Answer 34

All three. (example 6x6 drive)

Question 35

What common types of differential locks are used?

2

Answer 35

Jaw (dog) type clutch
and
disc/plate style clutch

Question 36

Applying a dog type clutch at high speeds can cause?

Answer 36

pre mature wear

Question 37

How is a dog type clutch applied?

Answer 37

Operator via air chamber

Question 38

If a large amount of steel shows up in an oil sample fro the differential with a dog style clutch what could be the cause?

Answer 38

High speed application of the clutch can damage splines leaving particles and potentially larger chunks of material in the oil.

Question 39

Which type of differential lock is the most forgiving?

Reference to wear/damage

Answer 39

Plate and disc type

Question 40

What is a sign that a differential lock is not disengaging when supposed to?

Answer 40

during a turn, one wheel will skid

turning can become more difficult

Question 41

What is the normal condition of a no-spin differential?

Answer 41

Engaged

Question 42

In a limited slip differential what causes the clutch packs to be applied?

Answer 42

Difference in speed between the two axles

Question 43

Can the original differential case be used when changing from a normal differential to a no-spin differential?

Answer 43

Yes

Question 44

You hear a racheting noise from a differential when the vehicle is turning, what could be the cause?

Answer 44

Normal noise during corning using a no-spin differential lock