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Heavy Equipment Technician Period 3 Alberta > 190303E > Flashcards

190303E Flashcards

1
Q

What type of braking system is a hydraulic retarder?

A

It is a supplementary or auxiliary braking system

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2
Q

Can a hydraulic retarder stop a machine?

A

No it can only help to slow down the vehicle or piece of equipment

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3
Q

Where are three locations a hydraulic retarder can be located?

A

At the end put between the transmission and the torque converter.
At the output of the transmission.
And in a remote location or driveline

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4
Q

What are some basic components of a hydraulic retarder?

A

Rotor, housing (stator), oil pump, oil cooler, control valve, wet brake and an accumulator

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5
Q

What type of vanes can a rotor have?

A

Straight or angled

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6
Q

What is the purpose of the retarder housing?

A

It encloses the retarder rotor providing a place for oil

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7
Q

Where does the hydraulic retarder get its oil from?

A

The same oil circuit as the torque converter and transmission or another source

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8
Q

At what temperature does oil burn off additives?

A

121 degrees Celsius or 250 degrees Fahrenheit

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9
Q

What is another type of oil cooler other than oil to coolant type?

A

Oil to air cooler

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10
Q

Retarder’s are controlled by three methods they are?

A

Manual operator control, air over hydraulic controls, electronic control

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11
Q

What switches and sensors are involved in an automatic control valve and circuit?

A

Ignition switch, mode selection switch or lever, clutch position switch and transmission and gear indicator, a fuel control position indicator (throttle position sensor)

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12
Q

If the ignition is off can the hydraulic retarder activate?

A

No it cannot

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13
Q

True or false. Are all hydraulic retarders modulated?

A

Some are not modulated they are either on or off

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14
Q

If a hydraulic retarder can be modulated by the operator. Is it done manually, pneumatically or either?

A

It can be modulated manually or pneumatically.

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15
Q

When is a wet brake system activated?

A

While the hydraulic retarder is Filling with oil. It is released once the hydraulic retarder is operational.

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16
Q

Why are hydraulic accumulator is used more on hwy or trucking applications?

A

Because in Offroad equipment we have a larger hydraulic pumps

17
Q

Does a air accumulator have springs?

A

No it does not

18
Q

How is an air accumulator triggered?

A

With a solenoid

19
Q

How much oil is left in the retarder housing when the retarder is not in use?

A

Just enough to lubricate moving parts.

20
Q

Can a hydraulic retarder be used in conjunction with an engine or exhaust brake?

A

Yes all three can be used at the same time

21
Q

Out of the three auxiliary braking systems, which is activated first?

A

The engine or exhaust break will be activated first. On long downhill grades the hydraulic retarder will be activated

22
Q

What is the energy conversion in a hydraulic retarder?

A

Kinetic energy by moving the vehicle is turned into heat energy from turbulence in the oil

23
Q

When does the rotor turn freely?

A

When the vehicle or piece of equipment is moving

24
Q

Is friction inside the hydraulic retarder higher or lower when oil is added?

A

The more oil added the more friction is created, slowing the output down

25
Q

What can happen if the retarder oil temperature rises higher than 135°C?

A

If the temperature rises above 135°C it can cause damage to the retarder. To avoid this you must apply the service brake or put the transmission in a lower speed

26
Q

What is required on a torque converter if the retarder is mounted in between the crankshaft flange and the flywheel?

A

The torque converter must have a lock up clutch

27
Q

How much torque is the torque converter multiplying when the retarder is activated?

A

The torque converter should not be multiplying torque

28
Q

When is the retarder most efficient?

A

When it is connected directly to the driveshaft

29
Q

When is a synchronizing valves used with a retarder?

A

When there is two transmissions on a piece of equipment. The synchronizing valve will prevent engagement of one transmission until the other transmission is in the right relation

30
Q

What happens when a hydraulic retarder is too small for its application?

A

It will create too much heat and deteriorate the oil quality.

31
Q

In what type of working condition should you increase oil change intervals?

A

When the equipment is working in mountainous terrain’s and carrying heavy loads

32
Q

The powertrain ECM needs what inputs?

A

Throttle position sensor,retarder oil temperature sensor, output shaft speed sensor, retarder enabled device, break application pressure sensor

33
Q

Which outputs are controlled by the powertrain ECM?

A

Retarder control valve solenoid? Warning light, brake lights, over temperature light

34
Q

What tools can help you troubleshoot and diagnose hydraulic retarder electrical faults?

A

A scan tool, Digital multimeter, a fault code light system

35
Q

Why should you check the magnetic plug or filter elements?

A

If you find different metals on the magnet or in the filter it can help you troubleshoot the retarder

36
Q

What could be the problem if you find shiny steel particles on the magnetic plug?

A

Possibly a pump failure or the pump is wearing

37
Q

What could be a problem if you find aluminum particles inside the filter element?

A

It could be the retarder rotor wearing

38
Q

What could be a problem if you find rubber particles inside the filter element?

A

You could have a seal or hose failure

39
Q

If you find iron or steel chips on the magnetic plug or inside the filter elements what could be the problem?

A

There are broken components

Heavy Equipment Technician Period 3 Alberta (15 decks)

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