Deck 60: Bearings, Seals, and Greases

Question 1

____________________ grease has a consistency that allows it to be applied through a zerk fitting with a grease gun.

Answer 1

Chassis

Question 2

While having a discussion, Technician A says that brinelling is when pieces break away from the bearing metal. Technician B says that spalling is when pieces break away from the bearing metal. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Answer 2

B

Question 3

All of the following statements are true EXCEPT:

A)leather does a good job around moisture or higher temperatures (above 200⁰F).
B)felt is a material that is sometimes used to keep out dirt.
C)to tell if a used seal is synthetic rubber or leather, scratch its surface.It will turn to a rougher, lighter color like brown or beige if it is leather.
D)felt does not do a good job of keeping oil confined and can also absorb water, contributing to rusting.

Answer 3

A

Question 4

The bearings that are MOST-Likely designed for radial loads but can withstand thrust loads as well are the:

A)plain bearings
B)single-row ball bearings
C)frictionless bearings
D)needle bearings

Question 5

____________________ roller bearings are used for front-wheel bearings because they can control end thrust when they are installed with their tapers facing in opposite directions.

Question 6

The grease that is MOST-Likely used to lubricate speedometer cables, emergency brake cables, splines, and leaf springs is:

A)lithium-based lubricant
B)chassis lubricant
C)wheel-bearing lubricant
D)solid lubricant

Question 7

Which of the following is LEAST-Likely a part of the wheel bearing assembly?

A)Thrust washer
B)Rotor
C)Hub and disc
D)Nut

Question 8

All of the following statements are true EXCEPT:

A)tapered roller bearings are self-aligning.
B)tapered roller bearings are assembled with the inner race, bearings, and cage as a single unit.
C)needle bearings can tolerate misalignment.
D)a very small roller bearing is called a needle bearing.

Question 9

Ball bearings have more friction than roller bearings but can operate at higher speeds.

Question 10

One of the ball bearing's disadvantages is that most of the weight of the vehicle is exerted on the bottom of the bearing on a very small surface area of the ball and race.

Question 11

Roller bearings control end thrust.

Question 12

A grease made from petroleum should not be used at temperatures in excess of 400⁰F unless it is being changed every hour or two.

Question 13

____ reduce friction and wear, dissipate heat, and protect metal surfaces from rusting.

A)Lubricants
B)Bearings
C)Hubs
D)Copolymers

Question 14

Which of the following statements is LEAST-Likely true?

A)Greases are fibrous and there are different sizes of fibers available.
B)The National Lubricating Grease Institute (NLGI) defines grease consistency in NLGI grade numbers.
C)A grease with a lower NLGI number is softer and is more likely to leak.
D)An all-season lubricant is used only in colder climates.

Question 15

____ grease is resistant to heat. It is usually thicker and specially formulated for use with various types of bearings.

A)Solid
B)Chassis
C)Wheel bearing
D)Universal joint

Question 16

The ability of a lubricant to maintain its viscosity across a wide variation in temperatures is called its ____________________.

Question 17

While having a discussion, Technician A says that seals are usually replaced during a bearing repack. Technician B says that there is no need to replace them. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 18

The ____________________ is the temperature at which grease turns into a liquid.

Question 19

An up-and down bearing load is called a(n) ____________________.

Question 20

Drive axle bearings are located at the ends of the rear axle housing on an RWD car or within the hub of an FWD car.

Question 21

What test would you perform to make sure that the wheel bearing is not too tight?

Question 22

Why is it that automobiles and equipment can use seals?

Question 23

What is the difference between polyacrylate seals and silicone seals?

Question 24

Why is it not advisable to spin a wheel bearing with compressed air?

Question 25

What is the cause of a worn spindle?