Exam 19: Automatic Transmission Maintenance

Technician A says that when excessive metal contamination has occurred in an Allison hydromechanical transmission,ALL the bearings should be changed.Technician B says that metal contamination in an Allison transmission requires that the external heat exchanger circuit be entirely replaced.Who is correct?

Technician A says that a high transmission oil level in an Allison transmission can cause the oil to aerate.Technician B says that low transmission oil level in Allison transmissions can cause aeration.Who is correct?

Which of the following conditions would be more likely to cause harsh upshifts in an Allison hydromechanical transmission?

Which type of gasket sealing compound should be used on the interior of an Allison hydromechanical transmission?

When changing the transmission fluid in an Allison hydromechanical automatic transmission,which of the following should be true?

Technician A says that when checking the oil level on the dipstick of an Allison transmission and it reads full,the actual oil level should be slightly above the top of the oil pan.Technician B says that at the correct oil level reading,the actual oil level will be slightly above the planetary gearsets.Who is correct?

Technician A says that a clogged breather can cause an inaccurate oil level reading on an Allison dipstick.Technician B says that when the transmission oil is cold,a high dipstick reading will result.Who is correct?

Which of these results of a stall test would indicate a problem of poor engine performance rather than a transmission problem?

When adjusting a manual selector linkage on an Allison hydromechanical transmission,in which range should both the selector and the transmission be?

When adjusting a mechanical modulator control linkage,how should the accelerator pedal be positioned?

If the engine is accelerated while checking the oil level in an Allison transmission,what will happen to the oil level?

When a stall test is performed and the results are within specification but the transmission overheats,what is the likely problem?

What is the range of normal operating temperatures for an Allison hydromechanical transmission?

Technician A says that shift point adjustment on Allision hydromechanical automatics can be calibrated by engine rpm.Technician B says that shift point calibration on the same transmission can be made on a test stand using output shaft speed.Who is correct?

Which of the following conditions could cause low main pressure in an Allison hydromechanical transmission?

Technician A says that a valve body and governor test stand can be used to check both governor and modulator pressure.Technician B says that a valve body and governor test stand can be used to check shift points and trimmer regulator operation.Who is correct?

If a torque converter stator was freewheeling during a stall test,what would be the indications?

When using the engine speed (rpm)method of adjusting shift points on an Allison hydromechanical transmission,what should be used as the reference speed for checks and any adjustments required?

How do you adjust an Allison hydromechanical valve body to correct shift points?

How should transmission fluid level in an Allison hydromechanical transmission be checked?