DM 212

How many planetary gearset are used in a four-speed Allison hydromechanical automatic transmission?

3

Where is a flex plate located?

Between the crankshaft and torque converter

Tech A says that an Allison output retarded functions independently from engine rpm during braking cycles. Tech B says that an Allison output retarded efficiency is not influenced y the transmission ratio during a braking cycle.

Both A and B

Tech A says that the number of planetary pinions in a carrier depends upon the torque load that the gearset is expected to carry. Tech B says that the planetary carrier assembly is capable of exerting the most leverage on the axis of planetary gearset.

Both A and B

Tech A says that when the first and fourth clutches are applied in a Allison hydro 4-speed trans the output will be reverse. Tech B says that when the first and fourth clutches are applied in an Allison 5-speed trans the output will be reverse

Both A and B

Tech A says that during the coupling phase the impeller and turbine should be turning within 10% of the same speed. Tech B says that the only time that the impeller and turbine turn at exactly the same speed is when the lock-up clutch is engaged.

Both Tech A and B

How are multiple disc clutches used in automatic transmissions?

Braking devices and power transfer

Which of the following is the key difference between a torque converter and other types of fluid coupling and flywheels?

Curve versus straight blades

A flex plate can also be known as a flex?

Disc

What does most to determine the power output of a torque converter?

Engine RPM

What components transfer engine crankshaft torque to the torque converter assembly

Flex plate

What is an advantage of a planetary gearset?

Gear loads are divided equally, compactness, and multiple ratios and reverse capablility- D all of the above

what is used to regulate main pressure in an Allison hydro trans

Main pressure regulator valve

When the sun gear is the input member and the ring gear is held stationary, what best describes the output?

Maximum forward reduction

Tech A says that a torque converter stator has a direct mechanical connection to the impeller. Tech B says that a torque converter stator has a direct mechanical connection to the turbine.

Neither A nor B

Tech A says that all heavy-duty trucks with automatic transmissions use centrifugal lock-up converters. Tech B says that centrifugal lock-up clutch consist of a piston, clutch plate and back plate.

Neither A nor B

Tech A says that when a torque converter flex plate is used a flywheel is never required. Tech B says that when a flex plate is used, the starter motor pinion engages with teeth on the converter housing.

Neither A nor B

Tech A says that when the first and forward clutches are applied in an Allison hhydro 5-speed trans the output is first gear. Tech B says that to produce reverse in the same transmission the reverse and first clutches must be applied.

Neither A nor B

what factors determine the transmission governor pressure

Output shaft speed

What is another term used to describe the impeller used on a torque converter?

Pump

In which gear selector position on an Allison hydromechanical transmission should main pressure be at its highest?

R

When the carrier in a simple planetary gearset is held and the sun gear is the input member at what speed direction is the ring gear turning?

Reverse direction, slower speed

What can influence upshifts in an Allison hydromechanical transmission

Road speed and throttle position

What type of stator tends to be found in heavy duty truck torque converters

Rotating

What will be the output result in a planetary gearset whenever the carrier is the input shaft

Speed increases

What usually connects a torque converter turbine to the transmission input shaft?

Splines

Tech A says that the multiple components that make up a planetary carrier assembly count as a single gear. Tech B says that if there is to be output from a planetary gearset, the planetary pinions in the planetary carrier MUST be rotating on their own axes.

Tech A

Tech A says that when a truck with an Allison Hydro transmission has to be towed the driveline should be disconnected because the transmission pump will not be driven. Tech B says that an Allison Hydro transmission oil pump is driven at any time the transmission output shaft is turned.

Tech A

Tech A says that when the lock-up clutch is engaged on a torque converter the coupling ratio between the impeller and turbine has to be 1:1. Tech B says at the fluid coupling point in a torque converter the impeller and turbine must be rotating at exactly the same speed.

Tech A only

Tech A says that when ut s necessary to rebuild a torque converter stator assembly it should be removed first. Tech B says that racked stator vanes can be TIG welded.

Tech A only

Tech A says that there are six separate clutches in an Allison four-speed transmission. Tech B says that there are six separate clutches in an Allison five-speed transmission

Tech B

What drives the oil pump in a typical Allison hydromechanical transmission

Torque converter rear hub

What will result in a simple planetary gearset whenever the carrier is the input mechanism?

Torque increases

What does the number of clutch plates and friction disc used in a clutch pack depend on

Transmission size and rating and transmission application

What components are locked to the front cover of a torque converter during the lock-up phase and not otherwise?

Turbine

What is the output or driven member of a torque converter assembly

Turbine

How is the power take-off gear in a Allison hydromechanical transmission driven?

Turbine in the torque converter

In what phase of torque operation will torque be multiplied?

Vortex Flow

which of the following statements is correct concerning modulator pressure

affects both upshifts and downshift, directlu related to accelerator position and sourced from main pressure

when should governor pressure be at its highest

at the highest road speed

what regulates converter-in pressure in the torque converter used in an Allison hydro trans

converter pressure regulator valve

which of the following can increase the retarding efficiency of an input retarded on an Allison hydro trans during braking

downshifting

what running conditions would product the highest modulator pressure

engine idling

How many planetary gearset are there in an Allison 5-speed hydro trans

four

what type of chassis auxiliary braking devices can be integrated into an Allison automatic trans

input retarder

If only the first speed clutch is applied in a Allison hydro transmission what would the output ratio

neutral

what type of valve is used in an Allison hydro trans to ensure that the control system upstream from the valve has sufficient pressure during shifts to execute its automatic functions

priority valve

What statement is true of an Allison hydromechanical transmission

some models are designed to start in second gear

How many planetary gearsets are their in an Allison 4-speed hydro trans

three

what is used to avoid shift shock in Allison hydro trans

trimmer valve