Deck 16: Standard Transmission Servicing

Question 1

What is the most likely cause of a failed transmission bearing with noticeable heat discoloration?

A) low oil level
B) fretting
C) fatigue
D) dirt

Answer 1

A

Question 2

Which of the following could cause a twisted mainshaft?

A) starting off in a high gear ratio
B) shock load
C) rear driveaxle spinout
D) all of the above

Answer 2

D

Question 3

When a mineral-based transmission lubricant is used which of the following would be the usual recommended oil change interval under normal highway operating conditions?

A) 30,000- 40,000 linehaul miles
B) 50,000-100,000 linehaul miles
C) 100,000-150,00 linehaul miles
D) 250,000 linehaul miles

Answer 3

B

Question 4

At what recommended intervals should a transmission air filter element be checked and then either cleaned or replaced?

A) Every lube job
B) Every A inspection
C) Every B inspection
D) Every C inspection

Question 5

What is the maximum temperature you can safely heat a bearing in order to facilitate installation over a shaft?

A) 275 degrees F (135 degrees C)
B) 375 degrees F (190 degrees C)
C) 425 degrees F (218 degrees C)
D) Never heat a bearing

Question 6

What is the recommended transmission oil change interval when Eaton E-500 lubricant is used in a linehaul truck application?

A) 500 miles
B) 50,000 miles
C) 500,000 miles
D) 5,000,000 miles

Question 7

Which of the following would be the MOST LIKELY cause of a transmission housing that becomes pressurized in low range only?

A) damaged O-ring in splitter cylinder
B) damaged insert valve
C) damaged O-ring in range cylinder
D) damaged range valve

Question 8

When assembling a ten-speed,twin-countershaft transmission which of the following must be timed?

A) front section
B) auxiliary section
C) both A and B
D) neither A nor B

Question 9

Which of the following would be the MOST LIKELY cause of air leakage from the range valve when in high range only?

A) crossed air line connections
B) damaged O-ring in range valve
C) defective regulator
D) damaged O-ring in range cylinder

Question 10

Technician A says that a mechanical road speed signal is driven off the input shaft of a standard transmission.Technician B says that an inductive type road speed sensor picks up its signal from the tailshaft of the transmission.Who is correct?

A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Question 11

What is recognized to be the cause of most transmission bearing failures?

A) dirt
B) excess heat
C) lack of lubrication
D) torque overload

Question 12

When attempting to identify the source of contaminants in transmission lube,which of the following are possible?

A) seals
B) breather
C) dirty lubricant storage containers
D) all of the above

Question 13

Which of the following indicates that the transmission oil level is correct?

A) oil is exactly even with the bottom of the filler hole
B) oil pours out of the filler hole when the plug is removed
C) oil is within one finger joint below the filler hole
D) oil is within two finger joints below the filler hole

Question 14

Technician A says that some transmissions rely entirely on splash lubrication.Technician B says that some transmissions use an oil pump to pressure lube some transmission components.Who is correct?

A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Question 15

If the air lines between the slave valve and the range cylinder are crossed,what would be the MOST LIKELY result?

A) low range selection will result in high range
B) low range selection will result in gear clash
C) continuous air leakage from the exhaust port of the control valve
D) continuous air leakage from the slave valve breather

Question 16

When about to troubleshoot a complaint of a noisy transmission on a truck,which of the following should be done first in a troubleshooting sequence?

A) road test
B) drain the transmission oil and check for metal particles
C) raise the truck off the floor and spin the wheels up in each gear
D) remove the transmission and disassemble

Question 17

Approximately where is the auxiliary drive gear usually located in a typical truck,twin-countershaft transmission?

A) close to front of the main box
B) close to rear of the auxiliary section
C) between the main and auxiliary sections
D) directly in front of the PTO gears

Question 18

Which of the following can cause burned mainshaft washers?

A) low oil level
B) improper towing
C) coasting with clutch disengaged
D) all the above

Question 19

Before towing a tandem-drive axle truck,hooked from the front,which of the following should be done to avoid damage to the transmission?

A) ensure that the drive wheels remain on the ground and the transmission is in neutral
B) disconnect the axle shafts on one side of the truck
C) remove all four drive axle shafts and cover the ends of the hubs
D) never tow a tandem drive truck from the front

Question 20

On a typical truck twin countershaft transmission,which of the following components would have to be removed to replace a damaged input shaft?

A) shift bar housing
B) auxiliary section
C) mainshaft
D) none of the above

Question 21

Technician A says that slow range shifts may be caused by dry (insufficient silicone lube)O-rings.Technician B says that slow range shifts can be caused by excessive silicone lube applied to O-rings.Who is correct?

A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Question 22

When troubleshooting the source of a transmission leaking oil from both the front and rear seals,which of the following should be checked out first?

A) air leaking into transmission housing
B) input shaft bearings
C) tailshaft bearings
D) plugged breather

Question 23

Technician A says that splitter slip-out often occurs when using the clutch on upshifts.Technician B says that splitter slip-out can be caused by pre-selecting splitter shifts.Who is correct?

A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Question 24

Which of the following problems would be more likely to cause a twisted mainshaft?

A) broken synchronizers
B) low transmission lube level
C) failed engine mounts
D) starting in too high a gear ratio

Question 25

When a transmission is removed from a heavy duty truck,the input shaft is observed to be extremely worn.Technician A says that the engine flywheel housing concentricity should be (dial)indicated.Technician B says that the engine mounts should be checked.Who is correct?

A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Question 26

Technician A says that hard shifts could be the result of sheared-off clutch brake tangs.Technician B says that when clutch brake tangs shear,the clutch brake is forced to rotate with the transmission input shaft? Who is correct?

A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Question 27

Technician A says that a fracture in the auxiliary section housing could be caused by seized clutch release bearing.Technician B says that a fracture in the auxiliary section housing could be caused by a driveline misalignment problem.Who is correct?

A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Question 28

Technician A says that a transmission output yoke retaining nut can be final torqued using a 1-inch drive shop air gun.Technician B says that the same nut can be safely removed using a 1-inch drive shop air gun.Who is correct?

A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Question 29

Technician A says that a new transmission filled with Eaton E-500 lubricant does not require an initial break-in drain and fill after the first 3,000 to 5,000 miles of service.Technician B says that E-250 lubricant is rated for service intervals of up to 250,000 linehaul miles.Who is correct?

A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Question 30

When installing a shift bar (rail)housing,how should the 3 rails be positioned?

A) all 3 in the forward detent position
B) all 3 in the rear detent position
C) 1st-reverse rail in forward position
D) all three in the neutral position

Question 31

What would be the result of engaging two sliding clutches at the same time during the assembly of a twin-countershaft truck transmission?

A) mainshaft and countershafts rotate
B) mainshaft rotates,countershafts lock
C) countershafts lock,mainshaft rotates
D) countershafts and mainshaft lock

Question 32

Technician A says that when range slipout occurs,the transmission air pressure regulator may require adjustment.Technician B says that range slipout can be caused by a leaking air hose.Who is correct?

A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Question 33

If a gear shift lever on a COE truck chassis jams in gear,which of the following would be the most likely cause?

A) improper linkage adjustment
B) broken detent spring
C) clutch brake drive tangs sheared
D) worn input shaft bearings

Question 34

When a yoke seal race is damaged,which of the following is the cost-effective repair method?

A) polish seal race with a crocus cloth
B) machine the race to an undersize
C) resleeve with a wear ring
D) replace the yoke

Question 35

Technician A says that some bolt holes used to couple flanges and manifolds to the transmission,bore through the housing and can potentially leak oil.Technician B says that thread sealant should be used on fasteners used to couple flanges and manifolds to transmissions.Who is correct?

A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Question 36

Technician A says that it is usual to mark two adjacent gear teeth on a countershaft gear for timing purposes.Technician B says that it is usual to mark a single mainshaft gear tooth for timing purposes.Who is correct?

A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Question 37

Technician A says that gear jump-out that always occurs in one main box ratio can be caused by a broken detent spring.Technician B says that a driver that complains of gear jump-out in all main box ratios,may be shifting without disengaging the clutch.Who is correct?

A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Question 38

Technician A says that a no range shift condition could be caused by cracked slave valve piston.Technician B says that to repair a cracked range shift piston,the compound (auxiliary section)must be removed.Who is correct?

A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Question 39

When heating a bearing prior to installation,which of the following is the recommended method of ensuring that it is not over-heated?

A) use a rosebud
B) torch and infra-red thermometer
C) hot plate and Tempilstick
D) use an arbor press

Question 40

Which of the following driver related conditions would be more likely to result in a twisted input shaft?

A) rough running engine
B) low transmission lube level
C) not using the clutch to shift
D) skip shifting