Exam 10: Hydraulically Controlled Transmission

As vehicle speed increases, centrifugal force causes weights inside the automatic transmission's governor to move outward on their pivots against the spring or hydraulic pressure in proportion to the vehicle speed.

Which of the following governor designs uses two valves: a primary valve and a secondary valve?

When the manual valve is in park position, the line pressure:

More line pressure is needed and governor pressure and modulator pressure/throttle valve pressure are not used in:

Technician A says that spool valves tend to be self-cleaning. Technician B says that park is obtained by mechanically locking one band and one clutch together. Who is correct?

At half throttle, the transmission may downshift from third gear to first gear if the vehicle speed is high enough.

Technician A says that reciprocating force controls governor pressure. Technician B says that centrifugal force controls governor pressure. Who is correct?

Technician A says that if a throttle valve cable is adjusted with too much slack, the throttle valve pressure will be too low and shifts will be early. Technician B says that if a throttle valve cable is adjusted with no slack before the throttle obtains WOT, the transmission could be damaged. Who is correct?

Which gear needs higher line pressure, and the modulator/throttle valve pressure are not used?

Technician A says that when governor pressure on one side of a shift valve overcomes spring pressure and throttle pressure on the other side, an upshift occurs. Technician B says when reverse boost pressure on one side of the reverse valve overcomes governor pressure on the other side, shift into reverse occurs. Who is correct?

Typically, a directly mounted governor to the output shaft has how many valves?

In second gear the line pressure is allowed to flow from:

Which of the following is typically calibrated to a particular engine on a governor?

A mechanical pressure control regulator valve is a simple mechanism that uses a spring and a _______ to dump excess fluid back to the transmission pan.

Technician A says transmissions can prevent a downshift that would exceed the engine's maximum rpm. Technician B says reverse only uses one speed so line pressure is directly applied by the manual valve to the appropriate apply devices. Who is correct?

Tech A says that fluid pressure in an automatic transmission is controlled by engine rpm. Tech B says that modulator pressure changes with engine vacuum. Who is correct?

Which of the following typically may need to be replaced during the servicing of a governor assembly?

Line pressure is boosted by throttle pressure to increase holding force of clutches and brakes to prevent slipping.

Technician A says to check the operation of the throttle valve boost, you do not need to disconnect the vacuum hose on a vacuum modulator and attach a vacuum pump to vary the line pressure. Technician B says to check the operation of the throttle valve boost, you need to connect a pressure gauge to the transmission line pressure test port. Who is correct?

If a vehicle is coasting in third gear, governor pressure ________ as the vehicle speed drops, causing the 2-3 shift valve to move back to the downshift position.