CORRECT DETAILED ANSWERS (VERIFIED ANSWERS)
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1. The truck with the air suspension system shown above leans to the right. Technician A says
that valveX could be the cause. Technician B says that valve Y
could be the cause. Who is right?
A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A or B - CORRECT ANSWER- 1. The correct answer is C, both technicians are right.
Height control valves can fail in either direction-that is, by controlling the height at too great a
level or at too low a level. If the truck leans, the cause can be either too great a height on one
side or too low a height on the other. Until the technician knows that
one side is too high or the other too low, he must assume that either valve might be
malfunctioning.
4. The drive axles on a truck with a walking beam suspension are out of alignment in a manner
that is causing vehicle tire wear and steering instability.
Technician A says the cause could be that the torque rods are too long or too short. Technician
B says the cause could be worn walking beam bushings. Who is
right?
A. Technician A only
,B. Technician B only
C. Both A and B
D. Neither A or B - CORRECT ANSWER- 4. The correct answer is B. The beam bushings maintain
horizontal alignment of the axles, especially on turns. When bushings are worn, the beam on
either
side can move forward or backward, turning the axles in relation to the frame and causing the
type of misalignment that causes tire wear and steering problems.
2. The driver of a truck says that he hears a clattering noise from the front axle when driving on
a rough road. Technician A says the cause could be worn shock absorber mounting bushings.
Technician B says the cause could be worn shackle bushings. Who is right?
A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A or B - CORRECT ANSWER- 2. The correct answer is C, both technicians are right.
Either a worn shackle bushing or worn shock bushing can cause noise due to looseness when
the truck hits a good bump. If there is clearance between the rubber bushing and mounting
bolt, or if the rubber
bushing has worn very thin, elongated or even broken and fallen out, the result will be a
clattering noise as the motion of the suspension repeatedly takes up the
clearance first in one direction and then in the other.
5. The driver of a truck says that it is too hard to steer and that the steering wheel return is too
fast. Which of these is the most likely cause?
A. too much negative caster
B. too much positive caster
C. too much negative camber
,D. too much positive camber - CORRECT ANSWER- 5. The correct answer is B. Caster action is
the most critical suspension alignment specification in terms of affecting steering wheel return
to the center. Caster
actually lifts the truck as the wheel is turned in either direction; when the driver allows the
wheel to return to center, the weight of the truck actually forces the steering system to that
position. When the caster setting is too high, the weight of the truck exerts too much force in
centering the steering and creates the symptoms
noted.
3. The driver of a truck that has just had its front springs and hangers replaced says that it is
hard to keep the steering wheel in a straight-ahead position. Technician A says the cause could
be that the caster shims were installed backwards. Technician B says the cause could be that
the wrong spring hangers were installed. Who is right?
A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A or B - CORRECT ANSWER- 3. The correct answer is A. Correct caster is critically
important in keeping tires at the right angle and enabling the steering system to maintain
directional
stability. Since the caster shims would have to be removed for this work to be done, it's quite
logical to assume they might have been installed backwards, which would create the critically
incorrect caster setting that would make the truck wander severely.
6. A steering gear binds when turning to the left after it has been adjusted. The most likely
cause is that the:
A. worm bearing preload was set too high
B. steering shaft U-joints are sticking
C. gearbox was not centered when the lash was adjusted
, D. recirculating ball nut thrust adjustment is off - CORRECT ANSWER- 6. The correct answer is
A. Excessive worm bearing preload would show up as binding as the steering was turned to one
extreme and the friction became excessive due to the combination of normal load and too
much preload. B is not the answer because sticking U-joints should be apparent and cause
rough rotation
of the wheel at all steering angles. If either lash or ball nut thrust adjustment was incorrect, the
box would either bind at the center or be too loose at the extremes
of travel.
7. Which of these is most likely to cause steering wheel shimmy?
A. too much positive caster
B. out-of-balance wheels
C. air in the power steering system
D. low tire pressure - CORRECT ANSWER- 7. The correct answer is B. Out-of-balance wheels
cause a high frequency vibration, which shows up in the wheel as shimmy. A is not the answer
because caster shows up as too much self-centering action (hard steering). Air in the power
steering system causes constantly or intermittently hard steering (lack of hydraulic force). Low
tire pressures generally do not cause an uneven force on the steering system, but rather poor
tread contact with the road and vague steering or hard steering.
8. Technician A says that steering columns are collapsible to prevent the column from causing
serious injury to the driver during a collision. Technician B says that when a steering column has
been collapsed, the entire column must be replaced. Who is right?
A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A or B - CORRECT ANSWER- 8. The correct answer is C, both technicians are right.
Steering columns are made to be collapsible to prevent the column from seriously impacting
the