Automatic Transmission and Torque Converters

Technician A says that the Simpson gear train combines multiple simple planetary gear sets so that load can be spread over a greater number of teeth. Technician B says that the Simpson gear train is able to obtain the largest number of gear ratios possible in a compact area. Who is correct?

technician A

technician B

both A and B

neither A nor B

Correct! Wrong!

The _____________ gear acts like a band to hold the entire planetary gear set together.

sun

carrier

ring

pinion

Correct! Wrong!

When an external gear tooth is in mesh with an internal gear, the output rotation for both gears will be the same.

true

false

Correct! Wrong!

In a planetary gear set, if both the sun and ring gear are held you would have:

reduction

direct

reverse

overdrive

Correct! Wrong!

Maximum forward reduction is achieved when the ______________ gear(s) is (are) stationary.

sun

carrier

ring

planetary

Correct! Wrong!

The oil pump in an automatic transmission circulates fluid for the purpose of:

lubrication

clutch and brake application

supplying oil to the torque converter

all of the above.

Correct! Wrong!

Technician A says that grooving of multiple disc clutch discs allows for oil to escape more readily during application. Technician B says the purpose of these grooves is to reduce suction between the discs and plates during release by allowing oil to enter more readily. Who is correct?

Technician A.

Technician B.

both A and B.

neither A nor b.

Correct! Wrong!

In Allison deep ratio models of transmissions, only the lowest gear is driven through the low (deep reduction) planetary gear set.

true

false

Correct! Wrong!

In an automatic transmission, governor pressure varies with the speed of the output shaft.

True.

False.

Correct! Wrong!

A customer requests that you change his automatic transmission oil and filter. Upon removing the oil pan you find a great deal of sludge in the oil pan. The probable source of this contamination would be from:

torque converter

multi-disc clutches or brakes

oil pump

planetary gear sets

Correct! Wrong!

An automatic transmission with a high oil level may overheat due to:

planetaries contacting the oil, subsequently churning air into it

governor overspeeding

torque overspeeding.

all of the above

Correct! Wrong!

An automatic transmission operating with a low oil level may result in:

air to enter the oil at the pump suction location

multi-disc clutches or brakes to slip

torque converter cavitation

all of the above

Correct! Wrong!

If anti-freeze (ethylene glycol) mixes with the transmission fluid you must:

change the oil immediately

change the oil as well as the torque converter

completely disassemble, clean and reseal the transmission and torque converter

change the filter regularly until all signs of anti-freeze are gone

Correct! Wrong!

Transmission fluid in the radiator tank of the vehicle could be an indication of a faulty transmission oil cooler.

True

False

Correct! Wrong!

An increase in the transmissions input speed will:

lower the oil level

raise the oil level

have no effect on the oil level

none of the above

Correct! Wrong!

An increase in transmission oil temperature will:

lower the oil level

raise the oil level

have no effect on the oil level

none of the above

Correct! Wrong!

When towing a vehicle equipped with an automatic transmission more than 1/2 mile you should disconnect the drive line or raise the drive wheels.

True

False

Correct! Wrong!

The TV circuit uses a modulator valve actuated by vacuum on gasoline engines, and by mechanical linkage or cables on diesel engines.

True

False

Correct! Wrong!

When overhauling an automatic transmission you should also:

flush or replace the oil cooler

disassemble and clean or replace the torque converter

flush the cooler lines

all of the above

Correct! Wrong!

When the carrier is held and the sun is the drive gear, in a simple planetary gear set, you would have:

maximum forward reduction

reverse reduction.

maximum forward overdrive

reverse overdrive.

Correct! Wrong!

When the carrier is held and the ring is the drive gear, in a simple planetary gear set, you would have:

maximum forward reduction

reverse reduction.

maximum forward overdrive

reverse overdrive

Correct! Wrong!

When the ring is held and the sun is the drive gear, in a simple planetary gear set, you would have:

maximum forward reduction

reverse reduction.

maximum forward overdrive

reverse overdrive.

Correct! Wrong!

When the ring is held and the carrier is the drive gear, in a simple planetary gear set, you would have:

maximum forward reduction

reverse reduction.

maximum forward overdrive

reverse overdrive

Correct! Wrong!

Technician A says that whenever the engine is running the oil pump in the automatic transmission is running. Technician B says that whenever the engine is running the torque converter is turning. Who is correct?

Technician A

Technician B

both A and B

neither A nor B

Correct! Wrong!

Technician A says that the inhibitor valve inhibits upshifting when the governor pressure is too high. Technician B says that the inhibitor valve inhibits downshifting when the governor pressure is too high. Who is correct?

Technician A

Technician B

both A and B

neither A nor B

Correct! Wrong!

An extra planetary gear set to provide for a deep ration model is found in the allison.

3 speed transmissions

4 speed transmissions

5 speed transmissions

all of the above

Correct! Wrong!

Which of the following may cause an unusually high temperature in an automatic transmission?

clogged oil cooler

low oil level

faulty torque converter

all of the above

Correct! Wrong!

Stall testing is done with:

vehicle stopped, brakes applied, in gear and wide open throttle

vehicle moving, climbing hill, wide open throttle

vehicle stopped, in neutral, brakes applied and wide open throttle.

vehicle stopped, brakes applied, in gear and engine idling

Correct! Wrong!

When stall testing there is maximum:

rotary flow

vortex flow

retarder pressure

governor pressure

Correct! Wrong!

When stall testing there is a great deal of heat generated.

True

False

Correct! Wrong!

When stall testing if engine RPM reading is 400 RPM over specifications, what may be the problem?

plugged engine air cleaner

transmission low on oil

both A and B are correct

neither A nor B are correct

Correct! Wrong!

When stall testing if engine RPM reading is 400 RPM under specifications, what may be the problem?

plugged engine air cleaner

transmission low on oil

both A and B are correct

neither A nor B are correct

Correct! Wrong!

When performing a stall test on an automatic transmission and torque converter, the engine RPM is 200 RPM below manufacturer''s specifications, what may be the problem?

plugged fuel filters

slipping clutches in the transmission

damaged impeller blades

stuck stator

Correct! Wrong!

An automatic transmission will not go into gear in either forward or reverse at an idle, the transmission oil pressure is normal, what may be the problem?

splines tom off at pump

low oil level

high oil level

shifter shaft broke off

Correct! Wrong!

It is not necessary to test the equipment after overhaul if you did the job right.

True

False

Correct! Wrong!

Before installing frictional clutches or bands you should:

match them to the appropriate steel plates

measure them for proper thickness

count the number of plates that were removed

soak them in clean transmission fluid

Correct! Wrong!

To prevent contaminants from entering the system during removal you should

cover the work area with a clean tarp

only use clean tools and coveralls

cover all hose and fitting openings immediately

never use air operated tools

Correct! Wrong!

The most important aspect of automatic transmission repair is:

proper adjustments

cleanliness

using the correct fluids

proper measurement of clearances

Correct! Wrong!

The best source for service information is:

the parts book

the operators manual

the shop foreman.

the service manual

Correct! Wrong!

In addition to testing fluid pressure in the transmission, you may also have to test for:

torque conversion

flow rate

lockup pressures

slippage

Correct! Wrong!

Mechanic A says that generally speaking, transmission failures will be either hydraulic or mechanical. Mechanic B says that you should check the fluid and have it analyzed only if you suspect transmission failure. Who is right?

A is right

B is right

both A and B are right

neither A or B are right

Correct! Wrong!

Before condemning a transmission for improper operation and removing for overhaul you should:

operate it under sever conditions

change the fluid and filters

check any adjustments to bands or linkages

have the operator use it until the problem is easy to define

Correct! Wrong!

You can determine if the fluid you are going to use matches manufacture''s requirements by checking the:

catalog listings

certification numbers

viscosity of the fluid

popularity listings

Correct! Wrong!

When checking for proper operation of the transmission, you should:

listen for noises and check the shift characteristics

load the system up with the brakes applied

only check the operation when the equipment is cold

clean the equipment first

Correct! Wrong!

If the origin of a fluid leak is difficult to locate, you can:

operate the machine until it is easier to find

keep checking the level and topping it up

wrap the suspected area with towels

use special dyes or additives, and black lights

Correct! Wrong!

When checking a transmission for operation, the first item that you should inspect for is:

fluid leaks

fluid level

proper operation

operating pressures

Correct! Wrong!

The valve which allows travelling speed to be slowed combined with the operation of the brakes is the:

trimmer valve

pressure relief valve

inching valve

torque converter inlet valve

Correct! Wrong!

A trimmer valve is used to:

change the fluid flow in the valve

reduce main pressure

sense the output speed of the transmission

apply the clutches slowly

Correct! Wrong!

The hydraulic operation of any transmission can be described by using:

a pressure chart

a power-flow diagram

a component list

a hydraulic schematic

Correct! Wrong!

One type of powershift control system has a safety valve that:

prevents high pressures in the control system

shifts the transmission into neutral if the pressure is low

prevents the engagement of gears if the engine is not idling slow enough

allows the operator to select only low gears

Correct! Wrong!

The timing of shifts in an automatic transmission is controlled by:

scheduling valves

accumulator regulators

inhibit valves

shift valves

Correct! Wrong!

Mechanic A says that when the throttle is wide open and engine intake manifold pressure is low, then the hydraulic pressure from the throttle pressure regulator will be high. Mechanic B says that throttle pressure is directly related to output shaft speed. Who is right?

A is right

B is right

both A and B are right

neither A or B are right

Correct! Wrong!

The pressure that relates to the amount of load on the engine is:

mainline pressure

control pressure

governor pressure

throttle pressure

Correct! Wrong!

The purpose of an accumulator is to prevent damage to the pump if the pressure in the system should fluctuate.

True

False

Correct! Wrong!

Mechanic A says that transmission ball check valves may direct fluid to flow in one direction or another, but will have no affect on pressure. Mechanic B says that spring pressure on a spool valve can be increased or decreased by using mechanical linkage and a lever. Who is right?

A is right

B is right

both A and B are right

neither A or B are right

Correct! Wrong!

If a basic spool valve has equal pressure applied to both ends and one end has a face that is twice as large as the other end, the valve will move

in the direction of the smaller face.

in the direction of the larger face.

nowhere, since it is balanced.

in the direction of the highest fluid pressure.

Correct! Wrong!

Pressure relief valves control fluid pressure by using:

fluid control pressure on the other side of the valve.

a specially sized orifice in the control valve.

spring pressure which opposes fluid pressure.

a one-way read valve.

Correct! Wrong!

If a passage has restriction that is 50% smaller than the normal passage size and input pressure is 350 psi, then the pressure after the restriction when fluid is flowing would be

100 psi.

175 psi.

350 psi.

700 psi.

Correct! Wrong!

To prevent damage to the transmission from metal particles, some transmission will use

magnetic separators.

centrifugal filters.

micron screens.

orifice filters.

Correct! Wrong!

Automatic transmission pumps are always driven by the torque converter.

True

False

Correct! Wrong!

As with any hydraulic system, the transmission fluid is retained in a

storage drum.

engine oil pan.

accumulator.

reservoir.

Correct! Wrong!

62) Mechanic A says that different combinations of holding and driving clutches used with different gear sets will provide all of the ranges required by a transmission. Mechanic B says that powershift transmissions usually have a parking pawl to prevent movement of the output shaft when the transmission does not have any clutches or bands applied to provide drive. Who is right?

A is right

B is right

both A and B are right

neither A or B are right

Correct! Wrong!

Multi -disc clutches can only be used for holding, never for driving.

True

False

Correct! Wrong!

Any time a vehicle equipped with an automatic transmission must be towed any distance, you should always

tow with the drive wheels on the ground.

disconnect the drive line.

drain the converter.

loosen off the bands.

Correct! Wrong!

In order to provide gear reduction, overdrive or reverse, an automatic or powershift transmission uses

shift collars.

holding devices.

pressure control valves.

shift levers.

Correct! Wrong!

If the planet carrier is held and the ring gear is input, the result from the sun gear would be

reduction.

reverse.

overdrive.

direct drive.

Correct! Wrong!

If the ring gear is held and the planet carrier is input, the result from the sun gear will be

reduction.

reverse.

overdrive.

direct drive.

Correct! Wrong!

If the sun gear is held and the ring gear is the input, the result from the planet carrier is

reduction.

reverse.

overdirve.

direct drive.

Correct! Wrong!

If any two members of a gear set are locked together, the result is

reduction.

direct drive.

reverse.

neutral.

Correct! Wrong!

The gear that is held in a planetary gearset is the

input unit.

annulus member.

output unit.

reaction member.

Correct! Wrong!

The planetary gear set has gears that are

in constant mesh.

shifted with a special collar.

not capable of handling heavy loads.

made of special materials.

Correct! Wrong!

Early powershift transmissions are different from automatic transmissions in that they

have more valve bodies.

do not provide deceleration.

must be shifted by the operator.

will only upshift under load.

Correct! Wrong!

Powershift transmission will provide deceleration if they are

manually downshifted.

placed in neutral.

in the "D" position only.

the lockup type.

Correct! Wrong!

Before inspecting a machine that has a power shift transmission

place the transmission in neutral.

apply the shift safety lock.

tag the transmission shift lever.

check the operator''s log.

Correct! Wrong!

When checking fluid from an automatic transmission, a technician should

check for proper color.

check for proper color and smell.

check for proper color, smell and any sign of particles.

check for proper color, smell, particles and correct viscosity.

Correct! Wrong!

Technician A says that automatic transmission gaskets must not be replaced by silicon sealants because of possible inhalation into the hydraulic system of the transmission. Technician B says that any place a gasket is used, there is an appropriate silicon sealant that can be substituted. Who is right?

A only.

B only.

both A and B.

neither A nor B.

Correct! Wrong!

To remove a transmission oil pump, a technician must

remove the transmission, then the torque converter, then the oil pump.

remove the transmission pan and filter, then remove the oil pump.

remove the transmission pan and filter, then remove the main control valve body, then the oil pump.

remove the transmission, then remove the torque converter, then remove the bell housing, then remove the oil pump.

Correct! Wrong!

The part of the torque converter or fluid coupling that is driven by the engine is the

impeller.

turbine.

stator.

driven torus.

Correct! Wrong!

Fluid motion in the converter is caused by

pressure from the pump.

movement of the vanes.

centrifugal force.

opposition to motion.

Correct! Wrong!

Fluid couplings are not as efficient as torque converters because

they do not have lock-up clutches.

they have curved vanes and stators.

they have different fluid requirements.

they have straight vanes and no stator.

Correct! Wrong!

Fluid flow that occurs at an angle to the impeller and is a spiral type of flow is called

vortex flow.

coupling flow.

rotary flow.

phased flow.

Correct! Wrong!

Fluid flow that occurs in the same direction as the motion of the impeller is called

Correct! Wrong!

Coupling speed occurs when

the stator locks and redirects flow.

vortex flow is highest.

rotary flow is lowest.

when the stator is free wheeling.

Correct! Wrong!

Stators may be held by

hydraulic pistons.

one-way clutches.

electromagnetic clutches.

momentum.

Correct! Wrong!

The circular flow of oil between the pump and the turbine is called

rotary flow.

stator flow.

coupling flow.

vortex flow.

Correct! Wrong!

The operation of a hydraulic lock-up converter requires the use of control valves.

True

False

Correct! Wrong!

High transmission fluid levels are better than low fluid levels.

True

False

Correct! Wrong!

Pressure testing the converter after it is removed is done to determine

if the converter will jam under load.

if the stator interferes with the turbine.

if there are any external leaks.

if the one-way clutch operates correctly.

Correct! Wrong!

Stall testing determine

Please select 2 correct answers

if the stator interferes with the turbine.

if the stator interferes with the impeller.

if the stator has too much end-play.

if the stator one-way clutch slips.

Correct! Wrong!

Mechanic A says that interference checks can only be performed on converters that can be disassembled. Mechanics B says that performance tests are not necessary after reassembly. Who is right

A is right.

B is right.

both A and B are right.

neither A or B are right.

Correct! Wrong!

In a torque converter when the turbine is turning at almost the same speed as the impeller

vortex flow is high and rotary flow is low.

rotary flow is high and vortex flow is low.

rotary and vortex flow are even.

the stator should be in the stopped position.

Correct! Wrong!

Technician A says the basic difference between a fluid coupling and a torque converter is that a fluid flywheel has straight blading whereas a torque converter has curved blades also the torque converter has a stator and a fluid coupling does not. Technician B says that the torque converter has the ability to multiply engine torque, the fluid coupling does not have this ability. Who is correct?

Technician A.

Technician B.

both Technician A and B.

neither Technician A or B.

Correct! Wrong!

In many cases the torque converter, because of its mass, takes the place of the engine flywheel.

True

False

Correct! Wrong!

Technician A says the pump (impeller) is the input or drive member of the torque converter. Technician B says the turbine is the output or driven member of the torque converter. Who is correct?

Technician A.

Technician B.

both Technician A and B.

neither Technician A or B.

Correct! Wrong!

The stator in a torque converter is

free to turn in both directions.

splined to an overrunning clutch.

ineffective at low speeds.

connected mechanically to the impeller.

Correct! Wrong!

The torque convertor pump (impeller) is positioned closest to the engine.

True

False

Correct! Wrong!

The torque convertor turbine blades have a greater curve than the impeller blades.

True

False

Correct! Wrong!

Some torque converters are equipped with a lockup clutch, this lockup

helps increase fuel efficiency.

reduces heat generated by the torque converter.

improves vehicle performance.

all of the above.

Correct! Wrong!

Which of the major torque converter parts is responsible for torque multiplication within the unit?

pump/impeller

stator

turbine

lockup clutch

Correct! Wrong!

The lockup clutch in a torque converter is the same as the overrunning clutch.

True

False

Correct! Wrong!

The torque converter has

its oil supplied by the automatic transmission internal pump.

its own internal oil supply and only circulates for cooling.

an oil filter attached to the turbine outlet via hoses.

oil of a different viscosity than that in the automatic transmission.

Correct! Wrong!

Torque converter stall is when the impellor is rotating under power and the turbine is stopped.

True

False

Correct! Wrong!