190102 B

Question 1

One possible cause for frame sidesway is ______________

Answer 1

an accident, collision or rollover.

Question 2

What is the difference between frame sag and bow?

Answer 2

A sagged frame is bent downward while a bowed frame is bent upward.

Question 3

What causes corrosion of frame material?

Answer 3

Any of these:
1) exposure to certain cargo materials.
2) climatic conditions (rain, snow, ambient temperature).
3)contact between two dissimilar metals such as aluminum and steel.

Question 4

What are 4 factors that accelerate frame stress and therefore the possibility of frame
cracking?

Answer 4

overloading,

Question 5

Improper frame alignment can be a source of _________________ and _________________ problems.

Answer 5

tracking and alignment problems.

Question 6

What should you use when marking a frame rail?

Answer 6

chalk or soapstone.

Question 7

What are 2 reasons for using hardened washers on bolted frame connections?

Answer 7

1. To prevent the head of the bolt and nut from embedding into the attached part or frame rail
2. to help distribute the load preventing localized overstressing of frame parts.

Question 8

What is an advantage of using Huck® fasteners for attaching frame components?

Answer 8

do not allow flexing of frame components.

Question 9

Should heat-treated frame rails be heated in order to straighten them?

Answer 9

No

Question 10

A vehicle equipped with a leaf spring suspension is leaning to one side. What is a possible cause of this?

Answer 10

broken leaf springs.

Question 11

List three 3 possible causes for an air spring suspension to bottom.

Answer 11

Any three (3) of the following are correct.
1) low system air pressure.
2) excessive ride system air leakage.
3) air spring cut or punctured.
4) maladjusted ride height control valve.
5) faulty ride height control or dump valve.

Question 12

State the procedure for checking shock absorber operation.

Answer 12

Remove the lower shock mount and then pull the shock piston rod out and push it in 4 or 5 times. You should feel resistance to shock absorber movement in both directions but greater resistance when the piston rod is pulled out.

Question 13

Is it acceptable to replace a single leaf in a leaf spring assembly if an individual leaf is damaged?

Answer 13

No

Question 14

Why is a compound like Alumilastic® used on the surfaces of aluminum suspension components that contact other metals?

Answer 14

prevents corrosive reactions.

Question 15

The thrust from a properly aligned drive axle will act along _________________

Answer 15

along the frame centreline.

Question 16

How can an equalizer beam end bushing clearance be checked?

Answer 16

By jacking the beam end up with a hydraulic jack and checking beam end movement.

Question 17

What is the best way to remove equalizer beam end and centre bushings?

Answer 17

use appropriate presses and pullers.

Question 18

What is the difference between bar pin and other types of equalizer beam end bushings?

Answer 18

they provide a point of axle alignment adjustment.

Question 19

What does the durometer number that on a rubber load cushions represent?

Answer 19

the hardness of the rubber cushion which determines its load capacity.

Question 20

Why must drivers drain air reservoirs at least daily?

Answer 20

To ensure moisture and contamination in the reservoirs will be removed.

Question 21

The driver will have difficulty connecting a tractor to a trailer if the ______________ on the air spring suspension is adjusted too high.

Answer 21

ride height

Question 22

When the load is removed from a vehicle equipped with an air spring suspension, the ride height control valve will __________________.

Answer 22

exhaust air from the air springs until the correct ride height is reached