automatic transmission Ch 7, 8 ,9
In a simple planetary gearset, which of the following will result in reverse gear?
The carrier is held, the sun gear is the input, and the output is at the ring gear.
When discussing the operation of a single-wrap band: Which of the following factors DOES NOT contribute to the effectiveness of a band?
The direction of rotation of the drum. Correct. Also note: A double-wrap band (having self-energizing characteristics like a drum brake system) would be affected by the direction of rotation.
Technician A removes bushings by carefully cutting one side of the bushing and collapsing it. Once collapsed, the bushing can be easily removed with a pair of pliers. Technician B removes small-bore bushings by tapping the inside bore of the bushing with threads that match a selected bolt, which fits into the bushing. After tapping the bushing, the bolt is inserted and a slide hammer is used to pull the bolt and bushing out of its bore. Who is correct?
both
Technician A says a band apply pin may be selective. Technician B says most bands are not adjustable as routine maintenance. Who is correct?
both
Technician A says a multiple-friction disc pack can be used to hold one member of the planetary gearset. Technician B says a multiple-friction disc pack can be used to drive one member of the planetary gearset. Who is correct?
both
Technician A says a scratched separator plate must be replaced. Technician B says make sure all drain back openings in the spacer plate are clear. Who is correct? Note: Technician A observed a scratch. How deep is the scratch? Assume the scratch is deep enough to cause a cross leak between two passages that are not supposed to have a common passage connection to answer for Technician A.
both
Technician A says an air test can be used to check servo action. Technician B says an air test can be used to check for internal fluid leaks. Who is correct?
both
Technician A says double-wrap bands have a smoother and more uniform grip, and lend themselves more to self-energizing. Technician B says a double-wrap band readily conforms to the circular shape of a drum; therefore, it can provide greater holding power for a given application force. Who is correct?
both
Technician A says electrical components from the valve body must not be soaked in parts cleaner. Technician B says a lint-free rag is a must when wiping down valves. Who is correct?
both
Technician A says loose planetary pinion gear bearings will cause the gear to whine when it is loaded. Technician B says damaged teeth on a planetary pinion gear will cause the gear to whine. Who is correct?
both
Technician A says mainline pressure is the source of all other pressures used by the transmission. Technician B says mainline pressure is the pressure used to apply clutches. Who is correct?
both
Technician A says that if diagnosis suggests a problem with only one or two valves, visual inspection of the valve body should start at those valves. Technician B says that if the transmission has heavily contaminated fluid, the entire valve body should be inspected and cleaned, or replaced. Who is correct?
both
While inspecting a clutch assembly that has an aluminum piston: Technician A carefully inspects the piston for hairline cracks that will cause pressure leakage, resulting in clutch slippage. Technician B says that if burned discs were found in the clutch pack, the piston should be checked for defects and cracks. Who is correct?
both
technician A says transmissions use compound planetary gears controlled by friction and reaction devices. Technician B says clutch and brake application charts are a must during diagnosis and transmission overhaul. Who is correct?
both
The spool valve's movement is controlled by ____________________
mechanical linkage, hydraulic pressure, spring pressure
Technician A says the Simpson geartrain is an arrangement of a common planetary gearset with two sun gears, two ring gears, and two planetary pinion carriers. Technician B says a Simpson geartrain is the most commonly used compound planetary gearset to provide five reduction gears. Who is correct?
neither
While assembling a multiple-friction disc pack: Technician A alternately stacks the steels and friction discs until the correct number of plates has been installed. Technician B installs all of the discs contained in the overhaul kit and corrects the clearance with a selective pressure plate or snap ring. Who is correct?
neither
While conducting an air test on a transaxle: Technician A notices escaping air at the metal or Teflon seals. He proceeds to replace them. Technician B says the clutch should apply with a slight delay, then a dull thud. Who is correct?
neither
Technician A says a simple check valve is used to block a hydraulic passageway. Technician B says it normally stops fluid flow in both directions. Who is correct?
tech A
Technician A says engine load can be monitored electronically through the use of various electronic sensors that send information to an electronic control unit. Technician B says the most commonly used load sensor is a vehicle speed sensor. Who is correct? Note: Today most vehicles use electronic controls and the MAF sensor is the most common engine load sensor. Consider Technician B incorrect.
tech A
Technician A says one-way overrunning clutches can be either roller or sprag type. Technician B says a roller clutch utilizes roller bearings held in place by sprags that separate the inner and outer race of the clutch assembly. Who is correct?
tech A
Technician A says spool valves are the most commonly used valve in an automatic transmission. Technician B says spool valves are normally used as relief valves. Who is correct?
tech A
Technician A says that a relief valve prevents or allows fluid flow until a particular pressure is reached. Technician B says that a relief valve prevents pressures from going too low. Who is correct?
tech A
Technician A says the pressure-regulator valve usually has the responsibility for filling the torque converter. Technician B says the pressure-regulator valve usually has the responsibility of keeping the fluid flowing by making sure the pressure is never balanced. Who is correct?
tech A
Technician A says thrust washers should be inspected for scoring, flaking, and wear through to the base material. Technician B says plastic thrust washers will not wear unless they are damaged. Who is correct? Technician B is not correct. The text in book says plastic thrust washers will not "show" wear. Meaning that it may not be easily visible without measuring with a micrometer.
tech A
While inspecting a planetary gearset: Technician A says blackened pinion shafts indicate severe overloading. Technician B says bluish gears indicate overheating. Who is correct?
tech A
The Lepelletier design connects a simple planetary gearset to a Ravigneaux gearset. Technician A says this gearset positions the Ravigneaux gearset on the same main shaft as the single planetary gearset. Technician B says this design allows the shaft to be long and hollow. Who is correct?
tech A check pg 264-267
Technician A says a transmission orifice is a bore in a passage that is larger than the connecting passages. Technician B says an orifice is used to dampen a fluid flow to prevent sudden or undue movement of a control valve. Who is correct?
tech B
Technician A says bushings can be heated with a torch to remove them easily. Technician B says bushings can be removed with a slide hammer and the correct attachment. Who is correct?
tech B
Technician A says deep scratches in a valve's bore can be removed with #600-grit abrasive paper. Technician B says one of the most common transmission problems is excessive valve body bore wear due to the constant shuffling of the valves by a duty-cycle solenoid. Who is correct?
tech B
Technician A says most FWD final drive units require that ring and pinion backlash and pinion depth be set to specifications. Technician B says ring gear and side gear bearing adjustments are required on all FWD final drive units. Who is correct?
tech B
Which of the following is NOT a good reason to replace a band? The band is chipped. The friction material is glazed. the friction material is soaked with fluid. The friction material has random wear patterns.
The friction material is soaked with fluid.
Which of the following statements about "shift feel" is NOT TRUE? It is affected by fluid type, the momentary engagement of a component in another circuit, pulsed pressures, and the clearance of the apply devices. It can be improved by using a restricting orifice or an accumulator piston in the brake or clutch apply circuit. To improve shift feel, multiple-disc packs may contain an additional friction plate between each of the steel plates. It is controlled by the pressure at which each reaction member is applied or released, the rate at which each is pressurized or exhausted, and the relative timing of the apply and release of the members.To improve shift feel, multiple-disc packs may contain an additional friction plate between each of the steel plates.
To improve shift feel, multiple-disc packs may contain an additional friction plate between each of the steel plates.
Technician A says a band or holding clutch is often released while a multiple-disc clutch pack is being applied. Technician B says the timing of these two actions must be just right or both components will be released or applied at the same time. Who is correct?
both
Technician A says a blocked oil delivery passage will cause a shaft to score. Technician B says that if a shaft is fitted with a check ball and the check ball does not seat properly, low oil pressure will result. Who is correct?
both
Technician A says driving clutches can have a set of friction plates splined to the transmission's input shaft. Technician B says driving clutches can also have a drum splined directly to the output shaft. Who is correct?
both
Technician A says most original equipment servo seals are of Teflon type. Technician B says a majority of replacement transmission gasket sets will supply cast iron hook-end seal rings in place of Teflon seals, and these are acceptable replacements. Who is correct?
both
Technician A says never use a magnet to remove the check balls. Technician B says be sure to do something that will help you remember where the balls were, such as photographing or drawing their location. Who is correct?
both
Technician A says over-torquing the hold-down bolts of the valve body can cause the valves to stick in their bores. Technician B says flat-filing the surface of the valve body will allow the valve body to seal properly and prevent cross leaks. Who is correct? Note: Assume Technician B is dressing down the surface as in removing high spots by gently drawing a fine mill bastard file across the mating surfaces. This type procedure is to knock down high spots from scratches or divots but not to re-machine the surface. Also as a point of note: a hand file would not be used to machine a surface. This is why you don't machine a warped cylinder head with a hand file. Consider Technician B as correct for this question.
both
Technician A says that when a small gear drives a larger gear, output torque is increased and output speed is decreased. Technician B says that when a large gear drives a smaller gear, output torque is decreased and output speed is increased. Who is correct? Note: Review question from the Chapter 1 material.
both
Technician A says the differential case is located between the side gears. Technician B says the differential case is mounted on bearings so that it is able to rotate independently of the drive axles. Who is correct?
both
Technician A says the dog clutch is used on the nine-speed automatic from ZF. Technician B says the dog clutch is used to lock two components together without the use of a multiple-disc clutch. Who is correct?
both
When inspecting valves from the valve body: Technician A says the edges of the spools should be damage-free but should not be sharp. Technician B says to identify a bent valve, install it into its bore and rotate it. If it binds or drags while it is being rotated, it is bent. Who is correct?
both
While assembling a valve body after cleaning it: Technician A lubricates all parts with clean ATF. Technician B says it is important that the valve-retaining plugs or caps be placed in the correct bore and in the correct direction. Who is correct?
both
While checking a planetary gearset: Technician A says the end clearance of the pinion gears should be checked with a feeler gauge. Technician B says the end clearance of the long pinions in a Ravigneaux gearset should be checked at both ends. Who is correct?
both
While checking the end play of a transfer gear assembly: Technician A says that if the end play of the output transfer shaft is incorrect, a different size thrust washer should be installed behind the output shaft transfer gear. Technician B says that after the end play of the output shaft has been corrected, the turning torque of the shaft should be measured. If the turning torque is too high, a slightly thinner shim should be installed. If the turning torque is too low, a slightly thicker shim should be installed. Who is correct?
both
While discussing boost pressures: Technician A says during certain operating conditions, mainline pressure must be boosted. Technician B says increased pressure is needed to hold brakes and clutches more tightly, such as in reverse or high load conditions. Who is correct?
both
While discussing front wheel drive differentials; Technician A says some transaxles rotate power from a transmissions output shaft through two helical-cut gears to a transfer shaft. Technician B says some transaxles use a simple planetary gearset for their final drive. Who is correct?
both
While discussing ring and pinion type differentials; Technician A says power is delivered to the differential assembly on the pinion gear. Technician B says the pinion teeth engage the ring gear, which is mounted upright at a 90-degree angle to the pinion. Who is correct?
both
While discussing some control modules: Technician A says some transmissions have a single assembly that contains all of the solenoids, the TCM, and a lead frame assembly. Technician B says the lead frame connects to the individual components, therefore fewer electrical connections are needed for these transmissions, eliminating many potential problems. Who is correct?
both
While discussing gear ratios available from a planetary gearset: Technician A says a single planetary gearset can provide only one reverse gear. Technician B says a single planetary gearset can provide only one gear reduction forward gear. Who is correct?
neither
Technician A says that if a valve cannot be cleaned well enough to move freely in its bore, the valve body should be replaced. Technician B says that if there is even the slightest bit of damage or varnish buildup in a valve's bore, the entire valve body must be replaced. Who is correct? Note: Technician A is not correct because the restriction in valve travel may be related to damage in the bore. Technician B is not correct because sometimes minor damage may be serviceable.
niether
Technician A says one-way clutches are effective as long as the engine powers the transmission. While the transmission is in a low gear and is coasting, the drive wheels rotate the transmission's output shaft with more power than is received on the input shaft. This allows the sprags or rollers to unwedge and begin freewheeling. Technician B says a one-way clutch is often used to allow engine compression to aid in slowing the vehicle down. Who is correct? Hint: Check the Marginal Notes in the chapter section regarding Gear Changes on Pages 297-302.
tech A
While discussing brake band operation: Technician A says a servo is a hydraulically operated piston assembly used to apply the band. Technician B says an accumulator is a hydraulic piston assembly that helps a servo to quickly apply the band. Who is correct?
tech A
While discussing shift pressure control valves: Technician A says that these valves can apply different pressures to a clutch pack depending on the commands from the TCM. Technician B says that modern transmissions do not use shift pressure control valves. Who is correct?
tech A
Technician A says that when the planetary carrier is the input member, the gearset produces a gear reduction. Technician B says that when the planetary carrier is held, the output of the gearset will be in the opposite direction as the input, and reverse gear will be produced. Who is correct?
tech B
While discussing differentials: Technician A says that as a vehicle goes around a corner, the differential side gears walk on the slower-turning or inside pinion gear. As the side gears walk around the slower pinion gear, they drive the other pinion gear at a greater speed. Technician B says an equal percentage of speed is removed from one axle and given to the other; however, an equal amount of torque is applied to each wheel. Who is correct? Note: Pay close attention to the wording on Technician A statement.
tech B
While inspecting a parking pawl assembly: Technician A says the pivot pin must fit loosely in its bracket and tightly in the pawl. Technician B says the engagement lug on the pawl must be square in order to fully engage into the parking gear. Who is correct?
tech B
While visually inspecting a roller-type one-way clutch: Technician A replaces the clutch because the rollers have a smooth finish. Technician B replaces the clutch because the race shows signs of brinelling. Who is correct?
tech B
