Bearings and Seals

The primary function of bearings is to

reduce friction.

reduce movement.

increase speed.

reduce efficiency.

Correct! Wrong!

Loads that occur at right angles to the shaft are called

axial bearings.

thrust loads.

angular loads.

radial loads.

Correct! Wrong!

Loads that are at a 45 degree angle to the shaft would require

axial bearings.

friction bearings.

combination bearings.

radial bearings.

Correct! Wrong!

Bearings which have no moving elements are called

roller bearings.

bushings.

Conrad bearings.

needle bearings.

Correct! Wrong!

An advantage of using a non-friction bearing is that:

it requires little space.

it has low cost.

it is quiet in operation.

it has low friction operation.

Correct! Wrong!

The most common bearing used in engine crankshaft and camshaft application is the

aluminum bearing.

bronze bearing.

babbit bearing.

soft steel bearing.

Correct! Wrong!

The method of lubrication that separates two objects entirely by a cushion of oil is called

dry friction.

hydrodynamic lubrication.

boundary lubrication.

phenolic lubrication.

Correct! Wrong!

The hardened steel rings which make up the inner and outer part of a non-friction bearing are called

races.

rolling elements.

cages.

radius.

Correct! Wrong!

To select a non-friction bearing, you must determine 1/the size of the bearing races, 2/the number and type of rolling elements and 3/ ________________.

the spacing in the cage.

the method of lubrication.

the type of races.

the direction of the load.

Correct! Wrong!

The most efficient bearing for radial loads is the

angular contact bearing.

full roller bearing.

Conrad bearing.

split race bearing.

Correct! Wrong!

Needle bearings will always have an inner race supplied with a new bearing.

True

False

Correct! Wrong!

One piece bushings should be removed and installed with

a hammer and punch.

an expanding puller.

a special driver and adapters.

a reamer.

Correct! Wrong!

One precaution when working with non-friction bearings is to always

use gasoline for cleaning.

use clean lubricants.

use wooden mallets to protect the bearings.

spin bearings to dry them.

Correct! Wrong!

One precaution when removing a bearing with a shop press is to

never use excessive force.

press until the bearing moves.

always load the outer race.

use a punch rather than a press.

Correct! Wrong!

One of the first indications or complaints that would indicate a fatigue failure in an anti-friction bearing would likely be

brinelling.

peeling and scratching.

vibration and noise.

excessive taper.

Correct! Wrong!

Seals which are used in locations where they are subject to motion are called

dynamic.

static.

inclusion.

exclusion.

Correct! Wrong!

The most common type of manufactured seal used today in dynamic applications is the

rubber seal.

leather seal.

felt seal.

synthetic seal.

Correct! Wrong!

One important factor in installing a manufactured dynamic seal correctly is to

use a soft brass drift to seat the seal to gently drive the seal to its seat.

use a screw driver or chisel shaft to gently drive the seal to its seat.

use a soft or dead blow hammer on the seal face to gently drive the seal to its seat.

use an installation tool to gently drive the seal to its seat.

Correct! Wrong!

A general rule for seal replacement is that you should replace

those seals that have defects.

any seal that has been disturbed.

only inclusion seals.

only exclusion seals.

Correct! Wrong!

The most common type of squeeze type static seal or packing is the

hydrodynamic.

Correct! Wrong!

When correctly installing an O-ring onto a sealing surface, you must make sure that

it is flattened completely.

it is slightly twisted.

it is protected from sharp edges.

it is installed dry.

Correct! Wrong!

After installing a new seal and assembling all the components into place, as a final check, you should always

wipe off excessive lubrication.

check for proper seal fit.

check for correct application.

check to ensure free operation.

Correct! Wrong!

Any type of damage to a bearing other than normal wear failure is called

premature failure.

post-operative failure.

contamination failure.

misalignment failure.

Correct! Wrong!

Too much lubrication is always better for extending the life of a bearing than too little lubrication

True

False

Correct! Wrong!

One possible cause of noise and vibration in an axle housing is

excessive operational creep.

seal leakage and loss of lubrication.

improper lubricant for the application.

a defective bearing.

Correct! Wrong!

Another name for friction bearings is

roller

bushing

anti-friction

element

Correct! Wrong!

Seals which are required to keep lubricants in are called

dynamic.

static

inclusion

exclusion

Correct! Wrong!

One advantage of silicon seals is that they can be used in high friction and high torque applications because they

are abrasion resistant

absorb lubricants

don''t cut easily

are compatible with EP lubricants

Correct! Wrong!

If you were selecting a seal for slow moving applications that would retain grease, you would select a

dual lip seal

single lip, spring loaded seal

single lip seal

hydrodynamic seal

Correct! Wrong!

Compression packings need frequent adjustment to compensate for wear.

true

false

Correct! Wrong!

The most common type of lip-type packing used is the:

U-ring

V-ring

cup

finished

Correct! Wrong!

Some exclusion seals that have a metallic lip are called:

wipers

scrapers

axial seals

boots

Correct! Wrong!

The most important consideration in selecting a bearing lubricant is the:

operating conditions

load conditions

temperature of operation

manufacturer''s recommendations

Correct! Wrong!

Technician A says brinelling appears as indentations across the bearing raceway. Technician B says brinelling occurs when the bearing rollers do not rotate. Who is right?

A only

B only

Both A and B

Neither A nor B

Correct! Wrong!

The most common cause of wheel bearing failure is likely to be

overloading

oil contamination

a damaged race/axle housing

improper lubricant selection

Correct! Wrong!

You are servicing a truck''s wheel bearings. Technician A says that you use a high quality high temperature grease when repacking is necessary. Technician B says it''s proper to move wheel bearings from one wheel to another. Who is right?

A only

B only

Both A and B

Neither A nor B

Correct! Wrong!

Technician A adjusts wheel bearings while turning the wheel assembly. Technician B refers to the manufacturer''s procedures when adjusting wheel bearings, Who is right?

A only

B only

Both A and B

Neither A nor B

Correct! Wrong!

A tapered roller bearing is best suited for:

axial loads

radial loads

heavy loads

Both A and B

Correct! Wrong!

If you use a hammer and a punch to install a bearing on a tight shaft and inside a tight bore damage to the bearing roller or ball raceways may result in the form of:

flaking

spalling

etching

brinelling

Correct! Wrong!

Thrust loads on a bearing are:

at right angles to the shaft

perpendicular to the shaft

parallel to the shaft

around the shaft

Correct! Wrong!

When repacking a wheel bearing with grease you should:

place all the grease you can in the hub before installing the bearings

pack only the bearings and leave the hub clean and dry

put grease in the hub only, it will flow to the bearings

pack the bearings and pack the hub adjacent to the bearings, leaving room for expansion

Correct! Wrong!

Darkened or burnt metal in a bearing is a sign of overheating caused by:

metal fatigue

a build up of rust and corrosion

lack of lubrication

scored or scratched rolling elements

Correct! Wrong!

Etching, as shown in the picture below, is most commonly caused by:

particulate build-up

overloading

passing electricity through the bearing

moisture and acid build-up

/wp-content/uploads/2022/02/q43.jpg

Show hint

Correct! Wrong!

The bearing below would be classified as a:

combination bearing

radial bearing

thrust bearing

ball bearing

/wp-content/uploads/2022/02/q44_0.jpg

Show hint

Correct! Wrong!

Spalling of bearings as shown below would be caused by:

over-greasing

impact forces

over-loading

over-heating

/wp-content/uploads/2022/02/q45_0.jpg

Show hint

Correct! Wrong!

Peeling of a bearing hardened surface, as shown, is most often the result of:

over-loading

over-torquing

over-heating

over-use

/wp-content/uploads/2022/02/q46_0.jpg

Show hint

Correct! Wrong!

When installing new roller bearings, the technician must first:

measuring the bearing cup outer diameter.

pack the prelubricated bearings with grease.

measure the inside diameter of the bearing to be sure that it is the correct part.

use forced air to spin the bearing and test for smooth operation.

Correct! Wrong!

Grease from a container which has been left open can still be used as long as you remove the contaminated top layer.

true

false

Correct! Wrong!

In relation to lubricants (transmission and drive axle) what is channeling?

A condition where a lubricant breaks down in high temperatures

A problem where extreme pressures on components causes a lubricant to separate

An observation of a liquid seeking the lowest centre of gravity in a specified space

A condition in which components do not get lubricated due to cold temperature, which thicken the lubricants causing greatly reduced flow

Correct! Wrong!

What damage is caused by over-greasing?

scoring

channeling

accumulation of grit around greasing points

blowing out a bearing seal

Correct! Wrong!

The primary function of bearings is to

Loads that occur at right angles to the shaft are called

Loads that are at a 45 degree angle to the shaft would require

Bearings which have no moving elements are called

An advantage of using a non-friction bearing is that:

The most common bearing used in engine crankshaft and camshaft application is the

The method of lubrication that separates two objects entirely by a cushion of oil is called

The hardened steel rings which make up the inner and outer part of a non-friction bearing are called

To select a non-friction bearing, you must determine 1/the size of the bearing races, 2/the number and type of rolling elements and 3/ ________________.

The most efficient bearing for radial loads is the

Needle bearings will always have an inner race supplied with a new bearing.

One piece bushings should be removed and installed with

One precaution when working with non-friction bearings is to always

One precaution when removing a bearing with a shop press is to

One of the first indications or complaints that would indicate a fatigue failure in an anti-friction bearing would likely be

Seals which are used in locations where they are subject to motion are called

The most common type of manufactured seal used today in dynamic applications is the

One important factor in installing a manufactured dynamic seal correctly is to

A general rule for seal replacement is that you should replace

The most common type of squeeze type static seal or packing is the

When correctly installing an O-ring onto a sealing surface, you must make sure that

After installing a new seal and assembling all the components into place, as a final check, you should always

Any type of damage to a bearing other than normal wear failure is called

Too much lubrication is always better for extending the life of a bearing than too little lubrication

One possible cause of noise and vibration in an axle housing is

Another name for friction bearings is

Seals which are required to keep lubricants in are called

One advantage of silicon seals is that they can be used in high friction and high torque applications because they

If you were selecting a seal for slow moving applications that would retain grease, you would select a

Compression packings need frequent adjustment to compensate for wear.

The most common type of lip-type packing used is the:

Some exclusion seals that have a metallic lip are called:

The most important consideration in selecting a bearing lubricant is the:

Technician A says brinelling appears as indentations across the bearing raceway. Technician B says brinelling occurs when the bearing rollers do not rotate. Who is right?

The most common cause of wheel bearing failure is likely to be

You are servicing a truck''s wheel bearings. Technician A says that you use a high quality high temperature grease when repacking is necessary. Technician B says it''s proper to move wheel bearings from one wheel to another. Who is right?

Technician A adjusts wheel bearings while turning the wheel assembly. Technician B refers to the manufacturer''s procedures when adjusting wheel bearings, Who is right?

A tapered roller bearing is best suited for:

If you use a hammer and a punch to install a bearing on a tight shaft and inside a tight bore damage to the bearing roller or ball raceways may result in the form of:

Thrust loads on a bearing are:

When repacking a wheel bearing with grease you should:

Darkened or burnt metal in a bearing is a sign of overheating caused by:

Etching, as shown in the picture below, is most commonly caused by:

The bearing below would be classified as a:

Spalling of bearings as shown below would be caused by:

Peeling of a bearing hardened surface, as shown, is most often the result of:

When installing new roller bearings, the technician must first:

Grease from a container which has been left open can still be used as long as you remove the contaminated top layer.

In relation to lubricants (transmission and drive axle) what is channeling?

What damage is caused by over-greasing?

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Heavy-Duty Mechanic - Trucks & Equipment