all moduel test questions Flashcards
an auxiliary section that only has a range shift could have a gear ratio change from one shift to the next by how much %
30 to 40 %
an auxiliary section that only has a splitter shift could have a gear ratio change from one shit to the next by how much %
15 to 20 %
can a combination of range , splitter and deep reduction be used to provide the operator with many gear positions
yes
why must the main supply line be properly routed and secure
to prevent damage from forgine objects and prevent becoming a moisture trap
the air filter/regulator will generally regulate air to how much psi
58 to 63 psi
is the master air control valve specific to each transmission
yes they need to match the speed of the transmission they are used on
what is the pourpose of the slave valve
the slave valve allows the operator to pre select the range shift by inhibiting the shift until the main section is in neutral
while the main section is in gear what keeps the slave pistion from moving
the actuating pin
what is the range cylinder and how is it shifted
the range cylinder is a double acting cylinder that uses air to shift in both directions
the splitter/deep reduction air cylinder is shifted when
air from the filter/regulator is directed to, or exhausted from the back side of the piston
how are the plastic air lines used in multiple countershaft transmissions connected and where do they carry air
they are connected with furrule/insert type fittings and they carry air to the master control valve and the slave and/or the spool valve
why do the rubber coated cloth braid hoses carry a large volume of air
to quickly complete the range shift
why would a manufacturer develop a semi-automatic transmission where only the top two gears are automatically selected
the top two gears are the most used so having them shifted automatically reduces operator workload considerably
on the semi-automatic transmissions the electronically controlled shift system is controlled by the
engine electronic control unit
why is the semi-automatic transmission left in the high splitter position when it is shifted into the auto position
makes it easier for the operator when shifting out of the auto position back into 7th
what are some of the system components used in the electronic controlled shift systems
shift controller
visusual display pannel
trasnmission controller (ecu)
X - Y shifter ( main section electric shift assembly)
shaft speed sensors
range and/or splitter assembly
inertia brake
wiring harness
the transmission shift controller contains
operator shift console and dash display
the dash display is an that output divice that informs the operator of the state of the shifting process by the use of what
arrows
numbers
letters
what component is resonsible for all of the transmission shifting operations
transmission controller
when signalled by the transmission controller how will the rail motor move the shift finger
along the shift shaft to the desired shift rail through a slotted conecttion between the rail nut and shift finger
the range and splitter shifting is done through the
electronicall controled electric over air solenoids
what is the purpose of the inertia brake
increase the rate of deceleration of the countershafts
what mode must the operator select to have manual control over both upshifting and downshifting
hold
what mode would the operator use to get maximum engine braking
low
whenerver the vehicle is shut down what will the shift controller and the transmission controller do
they will not power down imediatly but go through a shutdown procedure placing the transmission in neutral
what prevents the vehicle from being started without first verifying the transmission is in neutral
the start enable relay used by the automated transmission
during normal operation in DRIVE the shift controller co-ordinates the shift by communicating with ?
the transmission controller and the engine ECU
if operating conditions of the transmission change what dose the automated transmission have the ability to do
learn and adapt the shift points as the vehicle load conditions change . the operator can help the electronic contol system learn to use new shift points during the shifting process
what are the three data links used in the automated transmission electronic system
proprietary data link
SAE standard j-1939
SAE standard j-1587
what are the three ways a diagnostic fault can be retrived
service warning light on the shift console
scan tools
PC based diagnostic equipment
why should the transmission never be left in nuetral while thge truck is coasting
because the truck may gain to much speed and the electronic contol system may not be able to get the transmission back into gear
what are the three functions of a transmission
to multiply torque from the engine
to reverse the direction of torque delivery
and to provide an interruption in torque while the clutch is still engauged
what is the formula for calculating gear ratio
number of driven teeth divided by number of drive teeth
can an engine that developes high torque over several hundred rpm be coupled with a transmission that has fewer gears
yes
how should transmissions be matched to a vehicle
transmission gearing and torque handeling capacities should be matched to each vehicles normal operating conditions
what are the two functions of the synchronizer assembly
to match or synchronize the speed of a mainshaft gear with the speed of the mainshaft during the shifting process
to temporarily connect a selected mainshaft gear to the mainshaft once the speeds of the maiting parts have been synchronized
what are the three types of synchronizer assemblies used
block type
pin type
plate and disc
multiple countershaft transmissions can only have two countershafts
no some transmissions can have up to three
what are some advantages to multiple countershaft transmissions
smaller and lighter
floating design eliminates the need for bearings between the mainshaft and mainshaft gears
smaller gears can be used and cheaper spur cut gears can be used eliminating the need for thrust control washers
when multiple countershaft design is used the main forward section often has how many gear selections
five
multiple countershaft transmissions use several housings .these housings are kept in alignment through the use of
precise dowelling
how are the input shaft and gear driven
by the clutch discs
in a single coutershaft constant mesh desing the countershaft gears are
in constant mesh with the manshaft gears
the mainshaft gears are located in place by
a set of double washers
what is used to prevent transmission noise from being transmitted up into the cab
an isolator
the shift lever directly moves the ____ in the shift bar housing
shift rail
what is the function of the detent system
helps hold the shift rail in the neutral or selected gear position during operation
what is the function of the interlock system
prevents transmission damage by preventing two gears from being selected at once
what is the function of the spring loaded plunger
prevents the operator from selecting first or reverse when the vehilce is moving forward at a great speed
in an overdireve transmission which of the forward gears be direct
fourth
in most twin countershaft transmissions which gearing would the auxiliary section not provide
reverse
where does the auxiliary drive gear recieve torque
from the mainshaft
the auxiliary uses the synchronizer to aid in the ____ shift
range
the purpose of the range, splitter and deep reduction cylinders is to
use the air signal to shift the auxiliary section sliding clutches
what delivers toruqe to the driveline is supported on a tapered roller bearing and splined to the synchronizer sliding clutch
the output shaft
the two speed auxiliary section provides
reduction and direct drive
the three speed auxiliary section provides how many usable gears
12
which position provides direct drive in a four speed auxiliary transmission section
high range high splitter
what are the two methods of lubrication used on multiple countershaft transmissions
splash and pressure
when a spin on filter is used on a transmission lubrication system the filter is located between the oil cooler and the
pump outlet port
transmissions that utilize splash lubrication generally filter the oil by means of
magnetic plugs or magnet in the bottom of the case
what is the best way to define a hybrid vehicle
any vehicle that has two means of propulsion
what is the diffrence between a parallel hybrid and a series hybrid
a series hybrid the engine never directly propells the vehicle
a parallel vehicle an electric motor or hydraulic motor is sandwiched between the engine and the transmission assists with the propulsion
what are the three key components of a deisel parallel electric hybrid
motor/generator
inverter
power electronics carrier (PEC)
what are the two main functions of the motor/generator
to propel the vehicle
to charge the battery pack
why are lithium batteries desireable for electronic hybrids
low discharge rates and high storage capacity
during desiel electric propulsion mode what effect does the electric assist that the motor provides have on the desiel engine
lowers engine duty cycle
what effect will coasting or braking have on lithium ion batteries
they will be charged
in a deisel hybrid assembly which component recevies energy from the engine or the rear axle
the transfer case
what are the two functions of the hydraulic pump/motor
during coast or regenerative braking it provides oil flow into the accumulators to presurize the sytem
during propel the flow of oil is reversed and it provides torque to the driveline
during propulsion what is the function of the hydraulic motor accumulator and tranfercase
oil from the accumulators to the hydraulic pump making it act as a motor then transfreing oil to the transfercase which then applys torque to the driveline
in a deisel electric hybrid what color are the high voltage cables
orange
in a deisel hybrid motor what is the minimum amount of time to allow for the accumulator to bleed down
5 min
