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4rth Year Diesel Apprentice Classes > Transmission Shifting > Flashcards

Transmission Shifting Flashcards

1
Q

An auxiliary section that only has a range shift could have a gear ratio change as much as ___________
from one shift to the next.

A

30-40%

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2
Q

Combinations of range, splitter and deep reduction can be used to provide the operator with many gear positions.
True
False

A

True

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3
Q

The air filter/regulator generally regulates air to __________________ pressure.

a. 18 psi to 26 psi
b. 58 psi to 63 psi
c. 97 psi to 103 psi
d. 120 psi to 130 psi

A

b. 58 psi to 63 psi

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4
Q

What is the purpose of the slave valve?

A

The slave valve allows the operator to pre select the range shift by inhibiting the shift until the main selection is in neutral.

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5
Q

The range cylinder is a double acting cylinder that uses a spring to hold it in the low position and air to shift it into position.
True
False

A

False

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6
Q

The plastic air lines used in the multiple countershaft transmissions:

a. carry air to the master control valve.
b. carry air to the slave and/or spool valve.
c. are connected with ferrule/insert type fittings.
d. all of the above.

A

d. all of the above.

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7
Q

Explain why a transmission manufacturer would develop a semi automatic transmission where only the top two gears are automatically selected.

A

The top two gears are the gears used most in some vehicle applications. Having these shifted automatically, reduces the operator workload Considerably

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8
Q

Explain why the semi automated transmission is left in the high splitter position when it is shifted into the auto position.

A

Leaving the splitter in the high position makes it easier for the operator when shifting out of the auto position back into 7th.

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9
Q

The transmission shift controller contains:

a. electronic control unit and dash display
b. electronic control unit and operator shift console.
c. operator shift console and dash display.
d. main section electric shifter and range/splitter assemblies.

A

b. electronic control unit and operator shift console.

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10
Q

The component responsible for all of the transmission shifting operations is the:

a. transmission controller
b. shift controller
c. main section electric shift assembly.
d. engine electronic control unit

A

a. transmission controller.

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11
Q

The range and splitter shifting is done through.

a. electronically controlled solenoids that move the shafts.
b. electronically controlled electric over air solenoids.
c. electronically controlled reversible DC motors.
d. an air signal from the master control valve.

A

b. electronically controlled electric over air solenoids.

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12
Q

What mode must the operator select to have manual control of both upshifting and downshifting?

a. drive
b. low
c. hold
d. direct

A

c. hold

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13
Q

The operator must always disengage the clutch when starting the vehicle in case the vehicle was shut off while in a gear other than neutral or there is a short or ground fault in the neutral safety switch circuit.

a. true
b. false

A

b. false
When shutdown, the shift controller places the transmission in neutral. Start enable relay relay prevents the vehicle from starting if it is not in neutral.

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14
Q

If the operating conditions of the transmission change, a new program must be installed in the shift controller through a PC based diagnostic tool.

a. True
b. False

A

b. False

Automated transmission has the ability to learn and adapt shift points as load conditions change.

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15
Q

List the three ways that the diagnostic fault codes can be retrieved.

A

a. Service warning light on the shift controller.
b. Scan tools.
c. PC based diagnostic equipment.

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16
Q

An auxiliary section that only has a splitter shift could have a gear ratio change as much as _________.% from one shift to the next.

A

15 to 20%

17
Q

The main supply line must be properly routed and secure to prevent.
a.
b.

A

a. damage from foreign objects.

b. becoming a moisture trap.

18
Q

The master air control valve is not specific to each transmission to ease the number of parts in inventory.
True
False

A

b. False

19
Q

While the main section is in gear, the slave valve piston is kept from moving by the:

a. actuating pin.
b. detent ball.
c. spring-loaded plunger.
d. master control valve.

A

a. actuating pin.

20
Q

The splitter/deep reduction air cylinder assembly is shifted:

a. when air from the master control valve is directed from one side of the piston to the other.
b. when air from the filter/regulator is directed to one side of the piston to the other.
c. when the slave valve sends air to one side of the piston or the other.
d. when air from the filter/regulator is directed to, or exhausted from, the back side of the piston.

A

d. when air from the filter/regulator is directed to, or exhausted from, the back side of the piston.

21
Q

The rubber coated cloth braid hoses carry large volume of air needed to quickly complete the range shift.
True
False

A

True

22
Q

On the semi-automated transmission, the electronically controlled shift system is controlled by the:

a. transmission electronic control unit.
b. shift tower electronic control unit.
c. engine electronic control unit.
d. all of the above

A

c. engine electronic control unit.

23
Q

Identify four system components used in the electronic controlled shift systems.

A

a. shift controller
b. display panel
c. transmission controller
d. shaft speed sensors

24
Q

The dash display is an output device that informs the operator of the state of the shifting process by use of:

a. arrows.
b. numbers.
c. letters.
d. all of the above.

A

d. all of the above.

25
Q

The rail motor moves the shift finger along the shift shaft to the desired rail by rotating the rail yoke.
True
False

A

False

26
Q

The purpose of the inertia brake is to:

a. increase the rate of deceleration of the countershafts.
b. decrease the rate of deceleration of the countershafts.
c. increase the rate of deceleration of the mainshaft.
d. decrease the rate of deceleration of the mainshaft.

A

a. increase the rate of deceleration of the countershafts.

27
Q

Which mode selection would the operator use to get maximum engine braking?

a. drive
b. low
c. hold
d. default

A

b. low

28
Q

During normal operation in drive, the shift controller co-ordinates the shift by communicating with the transmission controller and the engine ECU.
True
False

A

True

29
Q

List the three data links used in the automated transmission electronic system.

A

a. Proprietary data link
b. SAE J-1939
c. SAE J-1587

4rth Year Diesel Apprentice Classes (26 decks)

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