Before installing countershaft bearings:
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 falls out of gear when the vehicle is driven over a bumpy road surface. Technician A says the problem could be worn detent notches in the shift rod. Technician B says the problem may be weak springs on the detent ball. Who is correct?
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 case through bolts on a transmission to prevent oil leakage.
Upon inspection of a twin countershaft transmission, the input gear (main drive gear) is found to have excessive spalling. Technician A says that all the gears on the mainshaft should be changed along with this gear. Technician B says that both countershaft drive gears should be changed along with this gear. Who is correct?
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 reassembling the front section?
When shifting into a lower gear, output torque is ______________and output speed is ________________.
Technician A says that the gear pitch of two gears must be the same for them to mate to each other. Technician B says that gears must have the same number of teeth for them to mate to each other. Who is correct?
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?
Technician A says that all the gears on the mainshaft are keyed to the shaft and rotate at the same speed as the mainshaft. Technician B says that the gears on the countershafts are keyed to the shaft and rotate at the same speed as the shaft. Who is correct?
Transmission PTO drive gears are keyed to the counter-shafts.
What is the main problem or concern of helical out gears?
Technician A says that tapered wear on shift collar teeth will cause excessive wear on the groove in the shift collar. Technician B says that tapered wear on shift collar teeth may cause a shift collar to jump out of gear. Who is correct?
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, extra attention must be paid to which gear in a 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 sychronizer. 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 trans shift cylinders cause?
One of the main causes of premature bearing failure in transmissions is:
Most new transmissions are filled with synthetic oils.
An important part of transmission removal and overhaul is:
Mechanic A says that standard transmission systems require periodic maintenance to locate possible failures before they occur and to ensure that a supply of clean lubricant is maintained at the correct levels. Mechanic B says that to prevent damage from these contaminants, transmissions will be equipped with magnets, filters or both. Who is right?
Mechanic A says that in many cases, leaks at the input and output shafts and at the shifter are caused by over-filling the transmission. Mechanic B says that when removing and replacing filters you should always use the old filter gasket if it is in good condition. Who is right?
Mechanic A says that one cause of bearing failure is abrasive in the lubricant. Mechanic B says that the collar clutch or gear will still engage fully even if the shift rails are bent. Who is right?
Mechanic A says that twin countershaft transmissions may vibrate a little bit if not timed properly but that there will be no damage. Mechanic B says that drive angle and clutch housing alignment only needs to be checked if there is an obvious problem. Who is right?
Mechanic A says that many heavy duty transmissions have oil pumps. Mechanic B says that all multiple countershaft transmissions have gear selection clutches on the countershafts. Who is right?
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 shifting a ten speed transmission 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 pop out?
While inspecting a transmission for leaks, the technician notices that the gaskets appear to be blown out of their mating sealing surfaces. What should the technician check first?
A vehicle that uses cone type synchronizes has a worn blocker ring and worn dogteeth on a gear. Technician A says that you must replace both the gear and the blocker ring to restore proper operation. Technician B says that because the blocker ring slows down the gear before the shift, you only need to replace the blocker ring. Who is right?
Technician A says that the clutch teeth on a gear should have a beveled edge. Technician B says that if the clutch teeth on a gear are worn, it could cause the transmission to jump out of gear. Who is right?
Technician A says that if the detents in the shifting tower are not aligned, it could cause main clutch wear. Technician B says that a broken detent in the shifting tower will cause the transmission to jump out of gear. Who is right?
Besides causing a possible vibration what might a bent mainshaft also cause?
Technician A says overfilling a manual transmission could result in overheating of the transmission. Technician B says overfilling a transmission could cause excessive aeration of the transmission fluid. Who is right?
A technician notices what appears to be overheated oil coating the seals of the transmission, but there does not appear to be gear damage. Technician A says that you must replace all the seals in the transmission. Technician B says that changing to a higher grade of transmission oil might be all that will be necessary. Who is right?
A broken transmission mount can cause any of the following EXCEPT:
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