Heavy Duty Truck Systems – Chapter 19 – Lecture Summary & Practice Questions
Which of the following conditions can cause aerated oil in automatic transmissions - ✔✔Both a
and b low and high oil level
On most Allison transmissions. when the oil level reads at the FULL mark on the dipstick with
the transmission operating temp, which of the following indicates the actual level of the oil in
the transmission - ✔✔if it is slightly below the planetary gearsets
which of the following could result in an inaccurate dipstick reading? - ✔✔all of the above
when performing an automatic transmission cold check level at what temp should the oil be? -
✔✔between 60F and 120F (16C and 49C)
when the transmission input speed is increased which of the following should happen the oil
level be? - ✔✔the oil level lowers
what effect will an increase in oil temp have on the transmission oil level? - ✔✔to raise the oil
level
the ____ is located on top of the transmission and its function is ton prevent pressure buildup
within the transmission housing - ✔✔breather
Tech A suggests that it is good practice to install an auxiliary filter after a transmission failure
that resulted in debris on being introduced into the hydraulic circuit. Tech B changes the
auxiliary filter every 5,000 miles (8,000km) Who is correct? - ✔✔Both A and B
What procedure should be used to identify whether the engine or transmission is at fault after a
drivetrain complaint in a chassis equipped with an automatic transmission? - ✔✔A stall test
Which of the following conditions can cause aerated oil in automatic transmissions - ✔✔Both a
and b low and high oil level
On most Allison transmissions. when the oil level reads at the FULL mark on the dipstick with
the transmission operating temp, which of the following indicates the actual level of the oil in
the transmission - ✔✔if it is slightly below the planetary gearsets
which of the following could result in an inaccurate dipstick reading? - ✔✔all of the above
when performing an automatic transmission cold check level at what temp should the oil be? -
✔✔between 60F and 120F (16C and 49C)
when the transmission input speed is increased which of the following should happen the oil
level be? - ✔✔the oil level lowers
what effect will an increase in oil temp have on the transmission oil level? - ✔✔to raise the oil
level
the ____ is located on top of the transmission and its function is ton prevent pressure buildup
within the transmission housing - ✔✔breather
Tech A suggests that it is good practice to install an auxiliary filter after a transmission failure
that resulted in debris on being introduced into the hydraulic circuit. Tech B changes the
auxiliary filter every 5,000 miles (8,000km) Who is correct? - ✔✔Both A and B
What procedure should be used to identify whether the engine or transmission is at fault after a
drivetrain complaint in a chassis equipped with an automatic transmission? - ✔✔A stall test
