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electrical and steering > retarders > Flashcards

retarders Flashcards

1
Q

hydraulic retarders are used to

A

reduce the speed of equipment through the use of hydrodynamic breaking

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2
Q

hydraulic retarders can be activated on a downhill grade to prevent

A

the engine from overspeeding and reduce the use of the service breaks

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3
Q

a hydraulic retarder is only a supplementary breaking system and will only

A

slow the machine not stop the machine

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4
Q

hydraulic retarders are identified by

A

where they are put in the machine

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5
Q

what are the three locations for hydraulic retarders

A

input - output - driveline

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6
Q

input retarders

A

located between the torque converter and the transmission

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7
Q

output retarders

A

installed on the transmission output shaft

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8
Q

output retarders will exert force

A

directly on the drive line and will act independently of changes in engine rpm or transmission gear selection

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9
Q

what are some output retarders equipped with a multi disc clutch pack

A

to eliminate the time delay for the retarder to fill with oil before breaking can begin

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10
Q

equipment hydraulic retarders is less effective at

A

low speeds

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11
Q

remote mount retarders

A

installed on the drive line

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12
Q

what are the components that make up a retarder

A

rotor - housing ( stator ) - oil pump ( supply circuit ) - cooler - control valve - wet brake - accumulator

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13
Q

what component is located between the housing and the stator of a retarder that has bent or angled vanes

A

retarder rotor

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14
Q

what is another name for the housing on a retarder

A

stator

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15
Q

why is it important to cool the oil of a hydraulic retarder

A

because the sheering of the oil during hard applications can cause the temperature to rise very fast

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16
Q

what are the three hydraulic retarder control methods

A

manual operator - air over hydraulic - electronic

17
Q

what are the basic switches for an automatic control circuit in a hydraulic retarder

A

ignition - mode selection switch or lever - clutch position switch and trans gear indicator - fuel control position indicator ( throttle position sensor )

18
Q

what will extend the service life of the hydraulic retarder and maintain oil quality

A

being able to modulate retarder control

19
Q

what is a wet break

A

a multi disc clutch pack used to start the retarding process

20
Q

wet breaks can also be applied when

A

the vehicle is traveling very slow

21
Q

why do some retarders use accumulators

A

as a fast fill method

22
Q

why do off road equipment seldom use accumulators

A

because the charging pumps are large enough for a fast fill without an accumulator

23
Q

the hydraulic retarder turns kinetic energy into

A

heat energy from sheering the oil

24
Q

the hydraulic retarder control circuit will allow the operator to

A

apply the service breaks at the same time to maximise breaking effort and safely stop the machine

25
Q

when the hydraulic retarder has been mounted between the engine crankshaft flange and the flywheel what must be required

A

a lock up clutch

26
Q

when is a retarder most efficient

A

when it is connected directly to the driveshaft

27
Q

what is the purpose of a synchronizing valve

A

to prevent engagement of scraper transmission until they are in the correct relation

28
Q

if the hydraulic retarder is to small for the application

A

excessive heat will be generated and oil will deteriorate very quickly

29
Q

what are some computer controlled inputs that may be controlled by the power train ECM

A

throttle position sensor - retarder oil temp sensors - shaft speed sensor - retarder enable device - brake application pressure sensor

30
Q

computer controlled outputs that may be controlled by the power train ECM are

A

retarder control valve solenoid - warning lights - brake lights - over temperature light

31
Q

shiny steel particles found during T/S

A

possible pump wear or failure

32
Q

aluminium particles found during T/S

A

retarder rotor wear

33
Q

rubber particles found during T/S

A

seal or hose failure

34
Q

iron or steel chips found during T/S

A

broken components

35
Q

if unusual particles are found during inspection of mag screen or filter

A

all oil circuits and components must be thoroughly flushed and cleaned before returning the retarder to work

electrical and steering (8 decks)

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