Deck 60: Bearings, Seals, and Greases

Question 1

12)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 1

A

Question 2

6)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

Answer 2

B

Question 3

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

Answer 3

False

Question 4

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

Question 5

7)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 6

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

Question 7

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

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

Question 8

13)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 9

14)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 10

4)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 11

17)____________________ 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 12

1)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 13

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

Question 14

15)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

Question 15

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

Question 16

3)Roller bearings control end thrust.

Question 17

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

Question 18

11)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 19

9)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 20

10)____ 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 21

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

Question 22

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

Question 23

25)What is the cause of a worn spindle?

Question 24

21)Why is it that automobiles and equipment can use seals?

Question 25

22)What is the difference between polyacrylate seals and silicone seals?