Ch 16 – Standard Transmission

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Oil level must be level with the bottom of the plug hole

Using a finger joint to measure is not a goo didea.

In order to activate the low-low ratio in a deep-reduction transmission in a heavy-duty truck which of the following must be done?
?
What component retains a shift rail in position following a shift?
a detent ball
Which type of gear is more likely to develop gear whine at higher speeds?
a spur gear
Which of the following best defines the axis of rotation of a gear or shaft?
centerline about which it revolves
To provide for overdrive gearing in the high- and low-auxiliary transmission ranges, which of the following components is added to the basic range-shift air control system?
a splitter cylinder
a button-actuated shift lever valve
When an idler gear is placed between the driving and driven gear, the driven gear
rotates in the same direction as the driving gear
An auxiliary mechanical drive for truck accessories driven by the transmission is known as a:
power take-off (PTO) unit
Which of the following statements is/are correct about geartrains?
They transmit speed and torque unchanged.
They decrease speed and increase torque.
They increase speed and decrease torque.
In a range shift air control system, which component distributes inlet air pressure to both the low- and high-range air hoses running to the range cylinder?
a slave valve
Which of the following is the most widely used standard transmission geartrain arrangement in heavy-duty trucks?
twin countershaft
Which of the following is true of a twin-countershaft standard transmission?
It divides input torque between two separate shafts…
It allows the face width of each gear to be reduced…
It allows the main shaft to float between the countershafts…
Which of the following gear ratios indicates the most amount of overdrive?
0.64:1
Which type of transmission requires double-clutching between shifts?
non-synchronized
Which of type of transmission auxiliary section is used to provide an overdrive ratio?
?
Which of the following components in a typical heavy-duty, twin-countershaft transmission could be described as floating?
the main shaft
Which of the following terms is often used to describe a certain type of transfer case?
?
When sliding gearshift mechanisms are used, which gears do they control?
High and low gears in the auxiliary section…
First and reverse gears in the main box…
Direct and overdrive gears in the auxiliary section…
Which of the following statements is true regarding the function of a transfer case?
It transfers torque from the transmission to a front drive axle…
It transfers torque from the transmission to the rear drive axle(s)…
It may provide an additional gear reduction in the drivetrain…
The component used to ensure that the main shaft and the main shaft gear about to be locked to it are rotating at the same speed is known as a:
synchronizer
When discussing the rotation of gears and shafts in a truck transmission, which of the following terms can be used to describe clockwise rotation?
Forward…
Right-hand…
Why is backlash required between meshing gears?
allows for heat expansion and lubrication of gears
When a gear with 14 teeth drives a gear with 21 teeth, how will speed and torque output be changed?
torque increases, speed decreases
If a truck transmission is described as being non-synchronized, which of the following is a recommended driving technique?
double-clutching
If a drive gear is required to rotate a driven gear in the same direction of rotation, which of the following is a requirement?
idler gear is required between the drive and driven gears
If transmission with a 5-speed main box is compounded by a two speed auxiliary section, how many gear ratios would be possible?
10
How many countershafts are used in the forward section of a RoadRanger transmission?
two