Heavy Manual Transmissions

Noisy drive train operation is usually the fault of the transmission.

True

False

Correct! Wrong!

The transmission oil is at the proper level when it is:

Visible through the filter opening

Reachable with a finger through the filter opening

Level with the bottom of the filler hole

Just below the filter hole

Correct! Wrong!

A driver complains that the transmission jumps out of gear when the vehicle is driven over a bumpy road surface. The problem could be:

Worn detent notches in the shift rod

Weak spring on the detent ball

Worn synchronizer rings

Either A or B

Correct! Wrong!

A gear ratio of 7.5:1 would have a lower torque output than a ratio of 3.3:1

True

False

Correct! Wrong!

If a 13 speed twin countershaft transmission is noisy in all gears except high range direct, the probable cause is:

P.T.O. gears

Countershaft bearings

Output shaft bearings

Input shaft bearings

Correct! Wrong!

Thread sealant is required on all open-hole bolts on a transmission case to prevent oil leakage.

True

False

Correct! Wrong!

Upon inspection of a twin countershaft transmission, the input gear (main drive gear) is found to have excessive spalling. What is the proper repair?

All the gears on the mainshaft should be changed along with this gear

Change the one bad gear but ensure there are not any metal fragments in the case

Replace only the gears that show spalling

Both countershaft drive gears should be changed along with this gear

Correct! Wrong!

A gear cut with the teeth at an angle to the axis of the gear is a ______________gear.

Helical

Worm

Spur

Ring

Correct! Wrong!

A gear cut with the teeth straight, parallel to the shaft, is a ___________gear.

Helical

Worm

Spur

Ring

Correct! Wrong!

Which type of transmissions require double-clutching between shifts?

Synchronized

Non-synchronized

Automatic

Hydrostatic

Correct! Wrong!

The twin countershaft design transmission:

Splits torque between two separate shafts

Allows the face width of each gear to be reduced

Allows the mainshaft gears to float between the countershafts

All of the above

Correct! Wrong!

Besides the main drive gear, what must also be marked for timing purposes before disassembling the front section?

Input shaft

Countershaft drive gears

PTO gears

Reverse idler gears

Correct! Wrong!

When shifting into a lower gear range, output torque is __ and output speed is _.

decreased, increased.

decreased, decreased.

increased,decreased.

increased,increased.

Correct! Wrong!

If an engine applies 1200 foot lbs. of torque to an input shaft and the gear ratio in first gear is 12:1 what is the output torque to the drive shaft?

1200 ft. lbs.

1440 ft. lbs.

10,000 ft. lbs.

14,400 ft. lbs.

Correct! Wrong!

When discussing the operation of a twin countershaft transmission, which of these statements is correct?

All the gears on the mainshaft are keyed to the shaft and rotate at the same speed as the mainshaft

All countershaft gears always rotate in the same direction as the main shaft

The gears on the countershafts are keyed to the shaft and rotate at the same speed as the shaft

The reverse idler gear always in the direction as the countershaft

Correct! Wrong!

Transmission PTO drive gears are keyed to the countershafts:

True

False

Correct! Wrong!

What is the main problem or concern of helical cut gears?

Noisy

Short service life

End thrust

Lack of strength

Correct! Wrong!

When discussing the actions of wear to the syncro''s in a transmission, which of these statements is not true?

Tapered wear on shaft collar teeth will cause excessive wear on the groove in the shift collar

Tapered wear on shaft collar teeth may cause a shift collar to jump out of gear.

Tapered wear on shift collar teeth may cause a shift collar to stick in gear

Tapered wear on shift collar teeth will not affect shifting adversely

Correct! Wrong!

If a technician forgot to install an interlock pin in a shift rod cover. Which of the following might occur?

The transmission being put in two gears at once

Grinding of all main section gears

Grinding when changing ranges

Grinding when split shifting

Correct! Wrong!

Which of the following may cause excessive wear on a shift fork?

Driving while learning on gear shift

Tapered teeth on a shift collar

Tapered clutching teeth in a gear where the shift collar makes contact

All of the above

Correct! Wrong!

When rebuilding a transmission, extra attention must be paid to which gear in a twin counter-shaft transmission, because it does more work than any other gear?

Main drive (input) gear

Countershaft drive gear

Mainshaft low gear

Reverse idler gear

Correct! Wrong!

When rebuilding a transmission, a technician finds that there are broken pins on the synchronizer. What may have caused this problem?

Split shifting while in neutral in the main section

Changing ranges while moving in reverse

Changing ranges while in neutral in the main section

Shifting without declutching

Correct! Wrong!

When mounting a PTO, a technician must:

Recheck the oil level after operating the PTO

Ensure there is correct backlash between PTO and the countershaft PTO gear

Ensure that the PTO is in neutral when the air shift cylinder is in neutral

All of the above

Correct! Wrong!

When towing a vehicle with axles in place, driveshaft in place and wheels turning the output shaft of the transmission, what is turning in the front (main) section of the transmission?

Countershafts

Mainshaft and shift collars

Main drive gear

Reverse idlers

Correct! Wrong!

What may overfilling the transmission oil level cause.

Oil foaming

Overheating

Oil leaks

All of the above

Correct! Wrong!

What may air leaks in a transmission shift cylinders cause?

Oil leaks

Poor shifting

No shifting

All of the above

Correct! Wrong!

One of the main causes of premature bearing failure in transmission is:

Lack of lubrication

Heavy shock loading

Improper operation

Improper installation

Correct! Wrong!

Most new transmissions are filled with synthetic oils.

True

False

Correct! Wrong!

An important part of transmission removal and overhaul is:

Check all threaded holes and bolt threads for quality

Inspection all of the parts during tear-down process

Drain, visually examine and analyze oil for particulates

All of the above

Correct! Wrong!

All standard transmission systems require periodic maintenance to locate possible failures before they occur, and:

To reduce damage, may be equipped with magnets

To reduce damage, contaminants may be filtered out

A supply of clean lubricant is maintained at the correct levels

All of the above

Correct! Wrong!

To increase the torque output capacity of a transmission, designers may add:

More gears

More bearings

Longer shafts

More countershafts

Correct! Wrong!

Interlock plates are included in the design of transmissions to:

Prevent gear locking

To allow the detents and springs to move

Lock the transmission when the vehicle is parked

Prevent engaging two gears at the same time

Correct! Wrong!

If a transmission is noisy in all gears except direct, what might be the problem?

Input shaft bearing

Output shaft bearing

Countershaft bearing

Pilot bearing

Correct! Wrong!

If a twin countershaft standard transmission is equally noisy in all the gears, what may be the problem?

Countershaft bearings

Input shaft bearings

Reverse idler shaft bearings

Worn countershaft drive gears

Correct! Wrong!

When a modern ten speed transmission is shifted from low to high range, how are the range selectors shifted?

Hydraulically

Manually

Air

Vacuum

Correct! Wrong!

A transmission is misaligned to the engine, which gear would be most likely to jump out?

High

Low

Second

Reverse

Correct! Wrong!

While inspecting a transmission for reported for oil leaks, the technician notices that a gasket appears to be blown out of their mating sealing surfaces. What could cause this to happen?

The transmission breather plugged

The wrong oil for the application

Over heated oil

The output shaft rear seal

Correct! Wrong!

A broken transmission mount can cause any of the following EXCEPT:

The vehicle to jump out of gear

Vibration at cruising speeds

Vibration at speeds below 30 mph

Various chunks and/or thuds

Correct! Wrong!

Besides causing a possible vibration what might a bent mainshaft also cause?

No other problems

Hard shifting

Worn input shaft splines

Oil foaming

Correct! Wrong!

Transmission drive shaft yokes with worn or damaged seal surfaces must be:

Replaced

Polished with emery cloth

Turned down on a lathe

Sleeved

Correct! Wrong!

To protect the transmission when towing any equipment with a standard transmission, it is advisable that you should pull the axle shafts or tow with the drive wheels off the ground.

True

False

Correct! Wrong!

Excessive gear clashing can cause:

Overheating of the transmission

Bearing wear

Gear damage

Shifter detent damage

Correct! Wrong!

Transmission gear tooth impact fractures are most commonly caused by:

Rapid acceleration

Accidents

Sudden severe overload

Vibration

Correct! Wrong!

The part of the synchronizer assembly that engages with the clutch teeth of the gear is the:

Hub

Sleeve

Struts

Stop rings

Correct! Wrong!

All of the gears that are on the main shaft are fixed in place except the reverse gear.

True

False

Correct! Wrong!

The shaft that transmits the power from the clutch to the rest of the drivetrain is the:

Counter shaft

Input shaft

Output shaft

Shifter shaft

Correct! Wrong!

Most transmissions collect ferrous metallic debris:

In the lubricant

In the filter

In the bypass trap

With a magnet

Correct! Wrong!

What is the most common cause of bearing failure in a transmission?

Extended high torque situations

Dirt in the lubricant

Operating machinery in high temperature situations

Poor quality of lubricant

Correct! Wrong!

Before disassembly and to ensure the proper timing of a three-countershaft transmission, what will the technician do?

Align the timing marks provided by the manufacturer

Mark the gears before disassembly, then align those marks during assembly

Align the keyway so that all countershaft keyway align with the main shaft

Align the timing tooth of each countershaft with the corresponding timing mark on the main shaft

Correct! Wrong!

A technician is dismantling a transmission counter shaft and notices that a bearing outer race is marred with slight brinelling. What could cause this type of marking?

Dirty transmission fluid

Normal vibration of the transmission

The bearing has been "spun"

Poorly manufactured bearings

Correct! Wrong!

Noisy drive train operation is usually the fault of the transmission.

The transmission oil is at the proper level when it is:

A driver complains that the transmission jumps out of gear when the vehicle is driven over a bumpy road surface. The problem could be:

A gear ratio of 7.5:1 would have a lower torque output than a ratio of 3.3:1

If a 13 speed twin countershaft transmission is noisy in all gears except high range direct, the probable cause is:

Thread sealant is required on all open-hole bolts on a transmission case to prevent oil leakage.

Upon inspection of a twin countershaft transmission, the input gear (main drive gear) is found to have excessive spalling. What is the proper repair?

A gear cut with the teeth at an angle to the axis of the gear is a ______________gear.

A gear cut with the teeth straight, parallel to the shaft, is a ___________gear.

Which type of transmissions require double-clutching between shifts?

The twin countershaft design transmission:

Besides the main drive gear, what must also be marked for timing purposes before disassembling the front section?

When shifting into a lower gear range, output torque is ________________ and output speed is _______________.

If an engine applies 1200 foot lbs. of torque to an input shaft and the gear ratio in first gear is 12:1 what is the output torque to the drive shaft?

When discussing the operation of a twin countershaft transmission, which of these statements is correct?

Transmission PTO drive gears are keyed to the countershafts:

What is the main problem or concern of helical cut gears?

When discussing the actions of wear to the syncro''s in a transmission, which of these statements is not true?

If a technician forgot to install an interlock pin in a shift rod cover. Which of the following might occur?

Which of the following may cause excessive wear on a shift fork?

When rebuilding a transmission, extra attention must be paid to which gear in a twin counter-shaft transmission, because it does more work than any other gear?

When rebuilding a transmission, a technician finds that there are broken pins on the synchronizer. What may have caused this problem?

When mounting a PTO, a technician must:

When towing a vehicle with axles in place, driveshaft in place and wheels turning the output shaft of the transmission, what is turning in the front (main) section of the transmission?

What may overfilling the transmission oil level cause.

What may air leaks in a transmission shift cylinders cause?

One of the main causes of premature bearing failure in transmission is:

Most new transmissions are filled with synthetic oils.

An important part of transmission removal and overhaul is:

All standard transmission systems require periodic maintenance to locate possible failures before they occur, and:

To increase the torque output capacity of a transmission, designers may add:

Interlock plates are included in the design of transmissions to:

If a transmission is noisy in all gears except direct, what might be the problem?

If a twin countershaft standard transmission is equally noisy in all the gears, what may be the problem?

When a modern ten speed transmission is shifted from low to high range, how are the range selectors shifted?

A transmission is misaligned to the engine, which gear would be most likely to jump out?

While inspecting a transmission for reported for oil leaks, the technician notices that a gasket appears to be blown out of their mating sealing surfaces. What could cause this to happen?

A broken transmission mount can cause any of the following EXCEPT:

Besides causing a possible vibration what might a bent mainshaft also cause?

Transmission drive shaft yokes with worn or damaged seal surfaces must be:

To protect the transmission when towing any equipment with a standard transmission, it is advisable that you should pull the axle shafts or tow with the drive wheels off the ground.

Excessive gear clashing can cause:

Transmission gear tooth impact fractures are most commonly caused by:

The part of the synchronizer assembly that engages with the clutch teeth of the gear is the:

All of the gears that are on the main shaft are fixed in place except the reverse gear.

The shaft that transmits the power from the clutch to the rest of the drivetrain is the:

Most transmissions collect ferrous metallic debris:

What is the most common cause of bearing failure in a transmission?

Before disassembly and to ensure the proper timing of a three-countershaft transmission, what will the technician do?

A technician is dismantling a transmission counter shaft and notices that a bearing outer race is marred with slight brinelling. What could cause this type of marking?

Success!

Heavy-Duty Mechanic - Trucks & Equipment

When shifting into a lower gear range, output torque is __ and output speed is _.