Exam 28: Allison 1000 and 2000 Series Transmissions

An Allison transmission comes in to the shop with ratio error codes for all gears. Tech A states that the transmission output shaft speed sensor could be faulty. Tech B states that the output shaft speed sensor can be checked with a DC voltmeter. Who is correct?

Which of the following Allison transmission models does NOT come equipped with a parking pawl?

An Allison 1000/2000 transmission C1 clutch pack assembly clearance is being measured. Technician A says that the clearance should be between 0.105" and 0.125". Technician B says that if the clearance is not within specifications, the backing plate should be changed. Who is correct?

All of the following can be used in cleaning a valve except:

Tech A states that the shift solenoids in an Allison transmission are pulse width modulated to control the shift feel. Tech B states that the trim solenoids are proportional current solenoids. Who is correct?

What special tool(s) is required to remove the C1 piston assembly from the assembly of an Allison 1000/2000 transmission?

Allison transmission reassembly is being discussed. Technician A says that the new clutch discs should be soaked for at least 15 minutes. Technician B says that new clutch discs should be soaked for at least 60 minutes. Who is correct?

Technician A says that the diesel engine equipped Allison 1000 transmission uses an engine speed sensor. Technician B says the engine speed sensor is not used on gasoline powered engines. Who is correct?

The output pressure of trim solenoid A of an Allison transmission is at 0 psi. Tech A states that the solenoid could be in failsafe mode. Tech B states that solenoid may have full current. Who is correct?

Choose the correct statement with respect to solenoids.

Two technicians are discussing transmission service on an Allison transmission. Tech A states that the internal filter should be changed every fluid service. Tech B states that the external filter is only changed during the first service. Who is correct?

The Alison 1000 series transmissions has two filters. Technician A says that the outside filter should be replaced at each service. Technician B says that the internal transmission filter only needs to be replaced at the first service. Who is correct?

Tech A states that Allison transmissions use two trim solenoids to control pressure. Tech B states that the transmission uses two pressure control solenoids. Who is correct?

In order to remove the manual linkage from the transmission, the roll pin will need to be removed using a:

The Allison transmission is completely ________ controlled.

All of the following statements with respect to the speed sensors are true except:

An Allison C3 clutch pack clearance is being measured. What is the acceptable clearance for a C3 clutch pack?

The 6-speed version of an Allison transmission has ________

The 2400 series Allison transmission is rated for ________ gross vehicle weight.

Tech A states that the solenoids of an Allison transmission use pulse width modulation. Tech B states that the solenoids do not use pulse width modulation. Who is correct?