Before installing countershaft bearings:
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Noisy drive train operation is usually the fault of the transmission.
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The transmission oil is at the proper level when it is:
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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?
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A gear ratio of 7.5:1 would have a lower torque output than a ratio of 3.3:1.
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If a 13 speed twin countershaft transmission is noisy in all gears except high range direct, the probable cause is:
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Thread sealant is required on all case through bolts on a transmission to prevent oil leakage.
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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?
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A gear cut with the teeth at an angle to the axis of the gear is a ____________gear.
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A gear cut with the teeth straight, parallel to the shaft, is a ____________gear.
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Which type of transmissions require double-clutching between shifts?
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The twin countershaft design transmission.
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Besides the main drive gear, what must also be marked for timing purposes before reassembling the front section?
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When shifting into a lower gear, output torque is ______________and output speed is ________________.
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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?
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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?
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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?
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Transmission PTO drive gears are keyed to the counter-shafts.
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What is the main problem or concern of helical out gears?
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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?
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If a technician forgot to install an interlock pin in a shift rod cover, which of the following might occur?
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Which of the following may cause excessive wear on a shift fork?
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When rebuilding, extra attention must be paid to which gear in a counter-shaft transmission, because it does more work than any other gear?
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When rebuilding a transmission, a technician finds that there are broken pins on the sychronizer. What may have caused this problem?
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When mounting a PTO a technician must:
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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?
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What may overfilling the transmission oil level cause?
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What may air leaks in a trans shift cylinders cause?
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One of the main causes of premature bearing failure in transmissions is:
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Most new transmissions are filled with synthetic oils.
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An important part of transmission removal and overhaul is:
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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?
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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?
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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?
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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?
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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?
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To increase the torque output capacity of a transmission, designers may add:
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Interlock plates are included in the design of transmissions to:
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If a transmission is noisy in all gears except direct, what might be the problem?
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If a twin countershaft standard transmission is equally noisy in all the gears, what may be the problem?
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When shifting a ten speed transmission from low to high range, how are the range selectors shifted?
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A transmission is misaligned to the engine, which gear would be most likely to pop out?
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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?
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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?
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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?
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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?
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Besides causing a possible vibration what might a bent mainshaft also cause?
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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?
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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?
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A broken transmission mount can cause any of the following EXCEPT:
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Manual Transmissions
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