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HET4 > 401E: Transmission Shifting > Flashcards

401E: Transmission Shifting Flashcards

1
Q

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

A

15 to 20%

401E: Transmission Shifting

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2
Q

401E: Transmission Shifting

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

A

30 to 40%

401E: Transmission Shifting

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3
Q

What is a master air control valve?

A

The shifter knob mounted on top of the shift lever.
Spesific to each transmission

401E: Transmission Shifting

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4
Q

What might prevent the operator from shifting the transmission after a vehicle has been parked in the winter without regularily draining the air tanks?

A

Frozen mosture in the auxiliary air lines

401E: Transmission Shifting

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5
Q

What filters and regulates the air pressure for auxiliary shifting?

A

Air Filter Regulator
- 60psi
- Filter elemment should be regularily cleaned.

401E: Transmission Shifting

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6
Q

What is the purpose of the slave air valve on a transmission?

A

Allows the operator to preselect the range shift by inhibiting the shift until the main section is in the neutral position

401E: Transmission Shifting

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7
Q

Where does the slave air valve receive its air supply from?

A

Air filter regulator
60psi

401E: Transmission Shifting

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8
Q

What holds the slave valve in place when the mainsection is not in neutral to prevent it from shifting from high to low range?

A

Actuating pin

401E: Transmission Shifting

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9
Q

When the auxiliary section is in low range, what pressure is in the air slave valve pilot line?

A

60 psi

401E: Transmission Shifting

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10
Q

When the auxiliary section is in high range, what pressure is in the air slave valve pilot line?

A

Vented to atmosphere.

401E: Transmission Shifting

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11
Q

When shifting into high range, what moves the spool in the air slave valve?

A

Spring force and supply air pressure from the air filter regulator.

401E: Transmission Shifting

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12
Q

The range cylinder is typically a:

a) single acting cylinger
b) double acting cylinder
c) double acting cylinder with spring assist

A

b) double acting cylinder

401E: Transmission Shifting

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13
Q

What colors of air lines are typical for the auxiliary supply, pilot, and splitter pilot lines?

A

Supply - Red
Pilot - Black
Splitter Pilot - Blue

401E: Transmission Shifting

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14
Q

In what type of automatic transmission would there be a dash-mounted display with arrows?

A

A 3-pedal auto shift
Down arrows indicate that the operator needs to slow down the input shaft before a shift can be made.

401E: Transmission Shifting

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15
Q

What component in an automatic transmission is responsible for all the shifting operations?

A

Transmission Controller

401E: Transmission Shifting

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16
Q

What replaces the manual gear shift tower and lever on an automatic transmission?

A

X-Y Main Section Electric Shift Asembly

401E: Transmission Shifting

17
Q

What component actuates the range and splitter cylinders in an automatic transmission?

A

Electric over air solenoids

401E: Transmission Shifting

18
Q

What component is used on some automatic transmissions to increase the rate of deceleration of the input shaft and countershafts to allow for quicker shifts?

A

Inertia Brake

401E: Transmission Shifting

19
Q

What component is used to prevent an automatic truck from being started without first verifying that the transmission is in neutral?

A

Start enable relay

An output device from the shift controller

401E: Transmission Shifting

20
Q

Where would speed sensors be located on an automatic transmission?

A

Input Shaft
Mainshaft
Output Shaft

401E: Transmission Shifting

21
Q

What is the difference between an automatic transmission’s Default gear and Starting gear?

A

Default Gear:
- Factory programmed

Starting Gear:
- User-set
- Defaults to the default gear after turning off the vehicle

401E: Transmission Shifting

22
Q

When should a driver never shift into Low on an automatic transmission while driving?

A

On icy roads or road conditions where hard braking would cause them to loose control of the vehicle.

401E: Transmission Shifting

23
Q

If the driver of an automatic transmission wanted to manually control the shifting, what position would he select on the shift control lever?

A

Hold / Manual

401E: Transmission Shifting

HET4 (39 decks)

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