Chapter 126 Four wheel drive
B
A customer complained of excessive vibration walk cornering and accelerating at the same time. Technician a says that a fault in the transfer case is most likely the cause. Technician B says the vibration may be normal if the vehicle is equipped with cardan u joints at the front wheels. Which technician is correct? A. Tech a B. Tech b C. Both techs D. Neither
B
A mode shift is used to select high or low range. A. True B. False
A
A rain shift occurs when the high or low speed ratio of the transfer case is selected. A. True B. False
C
A transfer case is difficult to shift (range shift). Technician a says that the shift linkage or shift fork maybe one or damaged. Technician B says that the blocking ring may be worn or damaged. Which technician is correct? A. Tech a B. Tech b C. Both techs D. Neither
C
A transfer case is extremely noisy and all selections except neutral whenever the vehicle is moving. Technician a says the drive chain may be stretched, causing the noise as it hits the inside of the case. Technician B says that one or more of the transfer case bearings could be defective. Which technician is correct? A. Tech a B. Tech b C. Both techs D. Neither
B
An all wheel drive transfer case must include a A. Low range gear set B. Differential C. Shifter for the front output shaft D. All of these
C
Driveline wind up on a part-time four-wheel-drive system results in all of the listed conditions except A. The turning radius is different for the left and right wheels as well as the front and rear wheels B. I will differential action between the front and rear axles C. Low traction situations from heavy rain mud or snow D. The front wheels tend to scoot along the pavement causing a driveline vibration
C
Technician a says a four-wheel-drive transfer case is an auxiliary 2-speed transmission. Technician B says a planetary gear set provides a low and high range. Which technician is correct? A. Tech a B. Tech b C. Both techs D. Neither
D
Technician a says full-time four-wheel-drive also allows the driver to select 2 Wheel Drive or four-wheel-drive. Technician B says part time for the drive includes a differential or viscous coupling that allows the front and rear axles to rotate at different speeds. Which technician is correct? A. Tech a B. Tech b C. Both techs D. Neither
C
Technician a says some four-wheel-drive vehicles use a solid front axle. Technician B says some four-wheel-drive vehicles use half shaft to send torque to the front wheels. Which technician is correct? A. Tech a B. Tech b C. Both techs D. Neither
C
Technician a says some front four-wheel-drive hubs must be manually locked and unlocked. Technician B says some front four-wheel-drive hubs can be automatically locked and unlocked which technician is correct? A. Tech a B. Tech b C. Both techs D. Neither
C
Technician a says that a vehicle equipped with part-time four-wheel-drive should be driven in four-wheel-drive only on slippery surfaces. Technician B says that full-time four-wheel-drive vehicles use a center differential in the transfer case. Which technician is correct? A. Tech a B. Tech b C. Both techs D. Neither
C
Technician a says that he transfer case may use GL-4 gear lube such as SAE 80w-90. Technician B says that a transfer case may use automatic transmission fluid such as Dexron III. Which technician is correct? A. Tech a B. Tech b C. Both techs D. Neither
A
Technician a says that most transfer cases have a built-in oil pump. Technician B says that most transfer cases use a heavy grease as a lubricant. Which technician is correct? A. Tech a B. Tech b C. Both techs D. Neither
D
Technician a says that the gear ratios of both differentials are the same in a four-wheel-drive vehicle. Technician B says that the rear differential has a slightly higher ratio (lower number) then the front differential. Which technician is correct? A. Tech a B. Tech b C. Both techs D. Neither
B
Technician a says the held member of a planetary gear set is called the drive member. Technician B says a held member of a planetary gear set is called a reaction member. Which technician is correct? A. Tech a B. Tech b C. Both techs D. Neither
A
The planetary gear sets used and transfer case is consist of all the following components except A. Forward clutch B. Planet carrier assembly C. Sun gear D. Internal ring gear
A
The transfer case contains all the following components except A. Four Drive sprockets B. Shift mechanism C. Front output shaft D. Planetary gear set assembly
D
Two technicians are discussing the front axle disconnect mechanism. Technician a says that the front axles are only disconnected if the vehicle is being towed. Technician B says that the unit is only used on all wheel drive vehicles. Which technician is correct? A. Tech a B. Tech b C. Both techs D. Neither
C
Two technicians are discussing the purpose of a transfer case in a four-wheel-drive system. Technician a says it transfers power to an additional axle. Technician B says some transfer cases have two speeds. Which technician is correct? A. Tech a B. Tech b C. Both techs D. Neither
C
Two technicians are discussing the towing of a four-wheel-drive vehicle. Technician a says the vehicle should be transported on a flatbed truck to avoid the possibility of doing damage to the drivetrain. Technician B says that the wheels not lifted off the ground of the tow truck should be placed on a dolly to prevent doing damage to the drivetrain. Which technician is correct? A. Tech a B. Tech b C. Both techs D. Neither
A
Two technicians are discussing the viscous coupling used in all wheel drive systems. Technician a says a viscous fluid such as a silicone-based oil is added to the assembly and fills the areas between the clutch plates. Technician B says the viscous coupling is active during equal traction conditions. Which could technician is correct? A. Tech a B. Tech b C. Both techs D. Neither
A
What four-wheel-drive system is shown in this drawing of a front axle? A. Axle disconnect mechanism B. Planetary gear set C. Rear axle disconnect system D. Not enough information
B
When part time four-wheel-drive vehicles in four-wheel-drive are engaged in the turn, which of these occur? A. The rear wheels turn faster and farther than the front wheels B. The front wheels travel faster and farther than the rear wheels C. The rear wheels travel faster and farther than the front wheels D. The front wheels will have reduced toe-out on turns
D
Which component is used in some transfer cases to prevent driveway wind up? A. Standard bevel gear differential B. Viscous coupling C. Planetary gear differential D. Any of these can be used to prevent drive wind up
A
Which type system uses it once we transfer case and a center differential with a viscous coupling? A. All wheel drive B. Full-time four-wheel-drive C. Part time four-wheel-drive D. Full-time four-wheel-drive Wheel Dr. with automatic locking hubs
