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1. How should transmission fluid level in an Allison hydromechanical transmission be checked?
a.
vehicle is on a level surface
b.
engine is idling
c.
transmission is in neutral
d.
all of the above
d
2. When changing the transmission fluid in an Allison hydromechanical automatic transmission, which of the following
should be true?
a.
fluid must be at room temperature
b.
gear selector should be in neutral
c.
engine should be running
d.
when high capacity oil pan is used, it must be removed
3. When adjusting a manual selector linkage on an Allison hydromechanical transmission, in which range should both the
selector and the transmission be?
a.
N
b.
R
c.
D
d.
D1
4. When adjusting a mechanical modulator control linkage, how should the accelerator pedal be positioned?
a.
fully released
b.
fully depressed
c.
disconnected
d.
against the gauge block
b
5. What precautions must be made before performing a stall test?
a.
ensure the service and park brakes are in good condition and applied
b.
ensure the wheels are blocked
c.
ensure that no one is standing in front of the vehicle
d.
all of the above
6. Technician A says that during a stall test, you should carefully observe the engine rpm. Technician B says that during a
stall test, the converter-out temperature should be monitored. Who is correct?
a.
Technician A only
b.
Technician B only
c.
Both A and B
d.
Neither A nor B
7. 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?
a.
Technician A only
b.
Technician B only
c.
Both A and B
d.
Neither A nor B
d
8. When the transmission fluid is at operating temperature and the level reads full on the dipstick, which of the following
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should be true?
a.
rotating members of the gearset are partially submerged
b.
fluid level is just below the top of the oil pan
c.
fluid level drops below the dipstick when the oil cools
d.
all of the above
b
9. When should an Allison automatic transmission be fitted with an auxiliary filter?
a.
after a major transmission failure
b.
when dirt and debris cannot be flushed from the circuit
c.
before a new transmission is placed into service after a major failure
d.
all of the above
d
10. Which of these results of a stall test would indicate a problem of poor engine performance rather than a transmission
problem?
a.
150 rpm above specification
b.
150 rpm below specification
c.
30% below specification
d.
30% above specification
b
11. 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?
a.
Technician A only
b.
Technician B only
c.
Both A and B
d.
Neither A nor B
12. 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?
a.
full-load (rated) governed rpm
b.
high idle
c.
peak torque
d.
idle
13. How do you adjust an Allison hydromechanical valve body to correct shift points?
a.
using a valve ring adjusting tool
b.
increasing or decreasing valve spring pressure
c.
both A and B
d.
neither A nor B
14. If a torque converter stator was freewheeling during a stall test, what would be the indications?
a.
extremely low stall speed
b.
extremely high stall speed
c.
engine overheating
d.
engine smoking
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15. Which type of gasket sealing compound should be used on the interior of an Allison hydromechanical transmission?
a.
RTV silicone
b.
3M weatherstrip adhesive
c.
Aircraft FormaGasket
d.
None of the above
16. During a stall test, what is the maximum time that full stall can be maintained before you have to allow the
transmission a cool down period?
a.
20 seconds
b.
30 seconds
c.
45 seconds
d.
60 seconds
17. What is the maximum permissable converter-out oil temperature during stall testing?
a.
150 degrees F (66 degrees C)
b.
220 degrees F (105 degrees C)
c.
300 degrees F (150 degrees C)
d.
600 degrees F (315 degrees C)
18. What is the range of normal operating temperatures for an Allison hydromechanical transmission?
a.
120 – 160 degrees F (50 – 70 C)
b.
160 – 200 degrees F (70 – 93 C)
c.
200 – 240 degrees F (93 – 116 C)
d.
240 – 270 degrees F (116 – 132 C)
19. Technician A says that when performing a stall test on an Allison hydromechanical transmission he places selector in
the DR position on a deep ratio model. Technician B says that on a four-speed hydromechanical Allison transmission a
stall test can be safely performed with the selector in D2, D3 or D4 positions. Who is correct?
a.
Technician A only
b.
Technician B only
c.
Both A and B
d.
Neither A nor B
20. Technician A says that shift cycling in Allison hydromechanical transmissions can be caused by improper
transmission oil level. Technician B says that harsh downshifts can occur in the same transmission when the transmission
oil level is not correct. Who is right?
a.
Technician A only
b.
Technician B only
c.
Both A and B
d.
Neither A nor B
21. Which of the following would be the more likely cause of an Allison hydromechanical transmission that downshifts
when the accelerator pedal is at full travel?
a.
governor adjustment
b.
loose modulator can
c.
improper oil level
d.
all of the above
22. Which of the following conditions could cause low main pressure in an Allison hydromechanical transmission?
a.
sticking clutch valve
b.
leaking accumulator seals
c.
sticking charging valve
d.
all of the above
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23. Which of the following conditions would be more likely to cause harsh upshifts in an Allison hydromechanical
transmission?
a.
mechanical modulator out of adjustment
b.
downshift points set high
c.
retarder cycling
d.
engine rated speed set low
24. When an Allison retarder on a hydromechanical transmission fails to operate at high speeds, what is the most likely
source of the problem?
a.
governor malfunction
b.
high main pressure
c.
air supply problem
d.
modulator malfunction
25. 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?
a.
Technician A only
b.
Technician B only
c.
Both A and B
d.
Neither A nor B
26. When a stall test is performed and the results are within specification but the transmission overheats, what is the likely
problem?
a.
engine malfunction
b.
stuck torque converter stator
c.
freewheeling torque converter stator
d.
differential carrier malfunction
b
27. 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?
a.
Technician A only
b.
Technician B only
c.
Both A and B
d.
Neither A nor B
28. 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?
a.
Technician A only
b.
Technician B only
c.
Both A and B
d.
Neither A nor B
29. If the engine is accelerated while checking the oil level in an Allison transmission, what will happen to the oil level?
a.
increase
b.
decrease
c.
increase due to foaming
d.
nothing
b
30. Technician A says that any metal particles regardless of size on the magnetic drain plug can indicate an imminent
transmission failure in an Allison. Technician B says that when coolant is present in Allision transmission fluid, the
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source is usually the oil cooler. Who is correct?
a.
Technician A only
b.
Technician B only
c.
Both A and B
d.
Neither A nor B
b
31. 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?
a.
Technician A only
b.
Technician B only
c.
Both A and B
d.
Neither A nor B
32. When should a governor filter on an Allison hydromechanical transmission be inspected?
a.
should be OK for the life of the transmission
b.
only when plugged
c.
every oil and transmission filter change
d.
monthly