Unit B: Suspension and wheels

Question 1

The term ____ ____ refers to the weight of the load and the vehicle above the point at which the springs are connected.

Answer 1

Sprung weight

Question 2

The type of frame rails commonly used on trailer frames is ____ and ____.

Answer 2

I-beams

Box

Question 3

____ seal packings are made of leather, felt, plastic and non-metallic material.

Answer 3

Static

Question 4

On the driveline of a tractor you should grease:
Driveshaft \_\_\_\_
Clutch fork \_\_\_\_
Clutch release \_\_\_\_
Inter-axle driveshaft \_\_\_\_ joint

Answer 4

U-joints
Pivots
Bearing
Slip

Question 5

Shoulder wear on a tire is caused by ____.

Answer 5

Under-inflation

Question 6

Preventive maintenance programs are designed to cut down on the amount of ____ machine down time.

Answer 6

Unexpected

Question 7

If a hourmeter is used as part of a maintenance program it is important to realize that the hourmeter records the time that the ____ is operating.

Answer 7

Engine

Question 8

If a leaf on a leaf spring assembly is cracked then you should replace ____.
The individual leaf or the complete assembly

Answer 8

The complete assembly

Question 9

The advantage of using a ____ seal is that they can contain high pressure, have a low leakage rate, and create little or no wear on a rotating shaft.

Answer 9

Face

Question 10

The type of seal used on heavy-duty equipment to keep contaminants out is the ____ seal.

Answer 10

Exclusion

Question 11

A radial lip seal that prevents fluids from leaking on a rotating shaft is a ____ seal.

Answer 11

Dynamic

Question 12

The number of articulation points for each following trailer on a “B” train configuration is _.

Answer 12

1

Question 13

For an overall preventive maintenance system to function properly the ____ must be involved in regularly scheduled servicing of the equipment, scheduled lubrication of the equipment and adjusting and inspection of the equipment.

Answer 13

Technician

Question 14

The number of articulation points for each following trailer on an “A” train configuration is _.

Answer 14

2

Question 15

On an air spring suspension system air is prevented from exiting the air springs when the ride control valve is in the ____ position.

Answer 15

Closed

Question 16

When a tire experiences a ____ ____ problem it will seem like it is bouncing or hopping.

Answer 16

Static balance

Question 17

To heat a bearing you should NOT use an ____ flames.

Answer 17

Open

Question 18

The double lip radial seal has one seal to seal in fluids and one to seal out ____.

Answer 18

Dust

Question 19

A liquid surge in a tank could cause the frame to ____.

Answer 19

Bow

Question 20

A certain load causes a spring assembly to deflect a certain amount. If the load is doubled and the amount of deflection doubles then the assembly is a ____ ____ spring assembly.

Answer 20

Constant rate

Question 21

A drop-leg landing gear on a trailer can be used to raise or lower a trailer.
True or False

Answer 21

False

Question 22

Directional tires are tires that should be mounted so they ____ in a certain ____ for self cleaning.

Answer 22

Rotate

Direction

Question 23

The term “dead-axles” refers to axles that are ____.

Answer 23

Non-driving

Question 24

After installing a fifth wheel assembly it is important to test and adjust the lock jaws. When testing, the kingpin should rotate with ____ resistance.

Answer 24

Some

Question 25

Basing a maintenance schedule on a dollar value spent on fuel is not an accurate method because:
fuel costs ____
fuel efficiency varies depending on ____
during idling no other parts of the machine are ____.

Answer 25

Fluctuate
Load
Operating

Question 26

A tire and rim assembly that allows it to be removed and still keep the spoke wheel attached to the vehicle is called a ____ rim.

Answer 26

De-mountable

Question 27

A bushing is a ____ bearing.

Friction or anti-friction

Answer 27

Friction

Question 28

After a connection is made to a no-slack pintle hook the mechanism is prevented from accidentally ____ by use of a latch and parking pawl.

Answer 28

Opening

Question 29

The first step when removing a fifth wheel from the mounting bracket is to remove the ____ ____.

Answer 29

Bracket pins

Question 30

The gear-operated landing gear on a trailer where the input speed is reduced and the torque is increased is called an ____.

Answer 30

Underdrive

Question 31

A pintle hook must be replaced if the wear exceeds ____ inch.

Answer 31

3/16

Question 32

Placing dual tires with a different section width on a heavy-duty vehicle will cause one tire to carry ____ of the load.

Answer 32

More

Question 33

When operating an off-road vehicle it is common to shut it down for maintenance after a certain amount of operation hourse.
True or False

Answer 33

True

Question 34

When a rim clamp is used to separate 2 trim and tire assemblies it must allow a minimum of _ threads to pass the face of the retaining nut.

Answer 34

3