401E: Transmission Shifting Flashcards
An auxiliary section that has a splitter shift could have a gear ratio change of as much as ______% from one shift to the next.
15 to 20%
401E: Transmission Shifting
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.
30 to 40%
401E: Transmission Shifting
What is a master air control valve?
The shifter knob mounted on top of the shift lever.
Spesific to each transmission
401E: Transmission Shifting
What might prevent the operator from shifting the transmission after a vehicle has been parked in the winter without regularily draining the air tanks?
Frozen mosture in the auxiliary air lines
401E: Transmission Shifting
What filters and regulates the air pressure for auxiliary shifting?
Air Filter Regulator
- 60psi
- Filter elemment should be regularily cleaned.
401E: Transmission Shifting
What is the purpose of the slave air valve on a transmission?
Allows the operator to preselect the range shift by inhibiting the shift until the main section is in the neutral position
401E: Transmission Shifting
Where does the slave air valve receive its air supply from?
Air filter regulator
60psi
401E: Transmission Shifting
What holds the slave valve in place when the mainsection is not in neutral to prevent it from shifting from high to low range?
Actuating pin
401E: Transmission Shifting
When the auxiliary section is in low range, what pressure is in the air slave valve pilot line?
60 psi
401E: Transmission Shifting
When the auxiliary section is in high range, what pressure is in the air slave valve pilot line?
Vented to atmosphere.
401E: Transmission Shifting
When shifting into high range, what moves the spool in the air slave valve?
Spring force and supply air pressure from the air filter regulator.
401E: Transmission Shifting
The range cylinder is typically a:
a) single acting cylinger
b) double acting cylinder
c) double acting cylinder with spring assist
b) double acting cylinder
401E: Transmission Shifting
What colors of air lines are typical for the auxiliary supply, pilot, and splitter pilot lines?
Supply - Red
Pilot - Black
Splitter Pilot - Blue
401E: Transmission Shifting
In what type of automatic transmission would there be a dash-mounted display with arrows?
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
What component in an automatic transmission is responsible for all the shifting operations?
Transmission Controller
401E: Transmission Shifting
What replaces the manual gear shift tower and lever on an automatic transmission?
X-Y Main Section Electric Shift Asembly
401E: Transmission Shifting
What component actuates the range and splitter cylinders in an automatic transmission?
Electric over air solenoids
401E: Transmission Shifting
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?
Inertia Brake
401E: Transmission Shifting
What component is used to prevent an automatic truck from being started without first verifying that the transmission is in neutral?
Start enable relay
An output device from the shift controller
401E: Transmission Shifting
Where would speed sensors be located on an automatic transmission?
Input Shaft
Mainshaft
Output Shaft
401E: Transmission Shifting
What is the difference between an automatic transmission’s Default gear and Starting gear?
Default Gear:
- Factory programmed
Starting Gear:
- User-set
- Defaults to the default gear after turning off the vehicle
401E: Transmission Shifting
When should a driver never shift into Low on an automatic transmission while driving?
On icy roads or road conditions where hard braking would cause them to loose control of the vehicle.
401E: Transmission Shifting
If the driver of an automatic transmission wanted to manually control the shifting, what position would he select on the shift control lever?
Hold / Manual
401E: Transmission Shifting
