ASE T3 EXAM
1. The tires on one side of a drive axle are 2-in, taller than the tires on
the other side. This condition could cause which of the following
problems?
A too much ring gear wear
B. too much lubricant loss
C. too much rear pinion bearing wear
D. too much differential pinion (spider) and side
gear wear - ANSWERS-21. The correct answer is D. With two
different size tires, the wheels will be rotating at different rpms-just as
when rounding a corner-all the time. The spider or pinion gears and
side gears are the ones that allow the wheels to rotate at different
speeds.
2. A technician is rebuilding a drive axle. In what order should he
make these adjustments?
A. carrier bearing preload, backlash, pinion preload
B. backlash, pinion preload, carrier bearing preload.
C. pinion preload, carrier bearing preload, backlash
D. pinion preload, backlash, carrier bearing preload - ANSWERS-22.
The correct answer is C. Backlash is affected by the preload
adjustments. For example, play in the carrier bearings would allow
the ring gear to shift back-and-forth: play in the pinion bearings
would allow the pinion to slide forward-and-backward. Both these
forms of play would be constantly changing backlash. Even without
,actual play, any change in preload would change the position of the
pinion or ring gear.
3. The driver of a truck with a single rear axle says he hears too much
rear axle noise only when the truck is pulling. Which of these is the
MOST likely
cause?
A. worn axle shaft bearings
B. worn wheel bearings
C. won differential pinion (spider) gears
D. worn ring and pinion gears - ANSWERS-23. The correct answer is
D. The ring and pinion gears carry load and are therefore directly
affected by load. All the other possible sources of noise mentioned
carry the same load whether the truck is pulling or not.
4. There are three differentials in a tandem axle arrangement. The
differential most susceptible for spin out failure is the
A. forward drive axle main differential
B. rear drive axle differential
C. inter-axle differential or power divider
D. all are equally susceptible to spinout failure - ANSWERS-24. The
correct answer is C. The inter-axle differential is positioned farther
above the oil supply than either main differential, and therefore
receives less lubrication. Also, all of its parts rotate at driveshaft
speed, rather than at wheel speed, as in the case of the ring gear and
its bearings. Spinout damage occurs when abnormal spider gear
rotating speeds occur in a differential due to unusually great
differences between wheel rotating speeds. The rotating speed of the
,pinion is not great enough to carry adequate lube up to the inter-axle
differential.
5. A technician is measuring the torque required to rotate the pinion
on a drive axle. He is using a spring scale in order to measure pinion
bearing preload. He asks two fellow technicians to describe the
correct
procedure. Technician A says to start with the parts stationary, and
read the spring scale very carefully while very gradually increasing
the tension on it. This will give an accurate reading of the torque
required to start the pinion rotating. Technician 8 says to get the
pinion rotating and then pull it at a very steady slow speed while
reading the scale. Who is right?
A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A or B. - ANSWERS-25. The correct answer is B. Rotating
torque must be measured at a slow, steady rotating speed. Starting
torque is noticeably higher than normal rotating torque.
6. A technician has disassembled an axle. When ordering parts, he was
asked the ratio, but there is no documentation available. To correctly
determine the ratio:
A. He should count the teeth on both pinion and ring gears and then
divide the number of teeth on the pinion gear (the smaller number)
into the number of teeth on the ring gear (the larger number).
, B. He should count the teeth on both pinion and ring gears and then
divide the number of teeth on the ring gear (the larger number) into
the
number of teeth on the pinion gear (the smaller number).
C. He can't determine ratio accurately by counting
the teeth. He must reassemble the unit, make appropriate markings
and rotate the pinion, counting revolutions until the ring gear has
rotated exactly one revolution.
D. He should contact the manufacturer and ask for the correct
documentation. - ANSWERS-26. The correct answer is A. Count the
teeth on both pinion and ring gears and then divide the number of
teeth on the pinion gear (the smaller number) into the number of teeth
on the ring gear (the larger number).
7. When diagnosing drive problems that may be related to differential
action, every differential on the truck must be checked out. Therefore,
technicians should be aware that heavy trucks with tandem drive
axles use differential(s)?
A. one
B. two
C. three
D. four - ANSWERS-27. The correct answer is B. The reason relates
to the requirements of providing power to four wheels. Tandem drive
axles are used on the majority of heavy trucks to give continuous
power at eight wheels. This helps ensure the truck's ability to carry
maximum loads while also pro-also providing good traction and
maximizing drive axle tire life. Thus, there is a differential in each of
the drive axles.
1. The tires on one side of a drive axle are 2-in, taller than the tires on
the other side. This condition could cause which of the following
problems?
A too much ring gear wear
B. too much lubricant loss
C. too much rear pinion bearing wear
D. too much differential pinion (spider) and side
gear wear - ANSWERS-21. The correct answer is D. With two
different size tires, the wheels will be rotating at different rpms-just as
when rounding a corner-all the time. The spider or pinion gears and
side gears are the ones that allow the wheels to rotate at different
speeds.
2. A technician is rebuilding a drive axle. In what order should he
make these adjustments?
A. carrier bearing preload, backlash, pinion preload
B. backlash, pinion preload, carrier bearing preload.
C. pinion preload, carrier bearing preload, backlash
D. pinion preload, backlash, carrier bearing preload - ANSWERS-22.
The correct answer is C. Backlash is affected by the preload
adjustments. For example, play in the carrier bearings would allow
the ring gear to shift back-and-forth: play in the pinion bearings
would allow the pinion to slide forward-and-backward. Both these
forms of play would be constantly changing backlash. Even without
,actual play, any change in preload would change the position of the
pinion or ring gear.
3. The driver of a truck with a single rear axle says he hears too much
rear axle noise only when the truck is pulling. Which of these is the
MOST likely
cause?
A. worn axle shaft bearings
B. worn wheel bearings
C. won differential pinion (spider) gears
D. worn ring and pinion gears - ANSWERS-23. The correct answer is
D. The ring and pinion gears carry load and are therefore directly
affected by load. All the other possible sources of noise mentioned
carry the same load whether the truck is pulling or not.
4. There are three differentials in a tandem axle arrangement. The
differential most susceptible for spin out failure is the
A. forward drive axle main differential
B. rear drive axle differential
C. inter-axle differential or power divider
D. all are equally susceptible to spinout failure - ANSWERS-24. The
correct answer is C. The inter-axle differential is positioned farther
above the oil supply than either main differential, and therefore
receives less lubrication. Also, all of its parts rotate at driveshaft
speed, rather than at wheel speed, as in the case of the ring gear and
its bearings. Spinout damage occurs when abnormal spider gear
rotating speeds occur in a differential due to unusually great
differences between wheel rotating speeds. The rotating speed of the
,pinion is not great enough to carry adequate lube up to the inter-axle
differential.
5. A technician is measuring the torque required to rotate the pinion
on a drive axle. He is using a spring scale in order to measure pinion
bearing preload. He asks two fellow technicians to describe the
correct
procedure. Technician A says to start with the parts stationary, and
read the spring scale very carefully while very gradually increasing
the tension on it. This will give an accurate reading of the torque
required to start the pinion rotating. Technician 8 says to get the
pinion rotating and then pull it at a very steady slow speed while
reading the scale. Who is right?
A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A or B. - ANSWERS-25. The correct answer is B. Rotating
torque must be measured at a slow, steady rotating speed. Starting
torque is noticeably higher than normal rotating torque.
6. A technician has disassembled an axle. When ordering parts, he was
asked the ratio, but there is no documentation available. To correctly
determine the ratio:
A. He should count the teeth on both pinion and ring gears and then
divide the number of teeth on the pinion gear (the smaller number)
into the number of teeth on the ring gear (the larger number).
, B. He should count the teeth on both pinion and ring gears and then
divide the number of teeth on the ring gear (the larger number) into
the
number of teeth on the pinion gear (the smaller number).
C. He can't determine ratio accurately by counting
the teeth. He must reassemble the unit, make appropriate markings
and rotate the pinion, counting revolutions until the ring gear has
rotated exactly one revolution.
D. He should contact the manufacturer and ask for the correct
documentation. - ANSWERS-26. The correct answer is A. Count the
teeth on both pinion and ring gears and then divide the number of
teeth on the pinion gear (the smaller number) into the number of teeth
on the ring gear (the larger number).
7. When diagnosing drive problems that may be related to differential
action, every differential on the truck must be checked out. Therefore,
technicians should be aware that heavy trucks with tandem drive
axles use differential(s)?
A. one
B. two
C. three
D. four - ANSWERS-27. The correct answer is B. The reason relates
to the requirements of providing power to four wheels. Tandem drive
axles are used on the majority of heavy trucks to give continuous
power at eight wheels. This helps ensure the truck's ability to carry
maximum loads while also pro-also providing good traction and
maximizing drive axle tire life. Thus, there is a differential in each of
the drive axles.
