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my stuff > Hydraulic Accessories Fluids And Seals > Flashcards

Hydraulic Accessories Fluids And Seals Flashcards

1
Q

Why should a dynamic seal have leakage

A

For lubrication

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2
Q

How can you determine the proper torque setting when your assembling a hydraulic system

A

Service manual

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3
Q

What type of sealant should be used on tapered pipe thread in a hydraulic system

A

Liquid PTFE

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4
Q

When static O-ring gaskets are used, what percentage must they protect.

A

10%

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5
Q

What size of micron particles do the most damage in a hydraulic system

A

4,6,14

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6
Q

What method is used to ensure you have achieved the target cleanliness code in a hydraulic system

A

Use of a particle counter

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7
Q

What filter has to be rated at the relief pressure of the system.

A

Pressure line filter

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8
Q

What is the recommended micron sized filter for reservoir filters

A

3

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9
Q

What is the efficiency of a filter with the beta ratio of 10

A

90%

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10
Q

What is the main purpose of the accumulator

A

To store pressurized hydraulic fluid

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11
Q

What extra safely precaution must he used when working on a system with an accumulator

A

Depressurization completely and block out accumulator

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12
Q

What type of gas could be used in a a gas accumulator

A

Nitrogen

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13
Q

What is the main disadvantage of a gas or spring type accumulator

A

Can not maintain a constant pressure as they discharge

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14
Q

What component in a reservoir reduces turbulence, AIDS in cooling and allows settle of dirt

A

Baffle

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15
Q

What condition can occurs if a strainer on a pump becomes clogged

A

Cavitation

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16
Q

What site is an open circuit reservoir compared to the capacity of the pump

A

2-3 times larger

17
Q

viscosity index (VI) of oil is defined as?

A

Stability of an oil viscosity over a temperature range

18
Q

Under what condition do you need a heater in a reservoir

A

When temp is to cold for fluid flow

19
Q

In addition to transmitting power what (4) things must hydraulic fluids do

A

Lubricate
cool
seal
flush

20
Q

What is the main cause of oxidation in hydraulic fluid

A

Heat

21
Q

List the 4 harmful products of oxidation in hydraulic fluid

A

Varnish
Gum
Sludge
Acid

22
Q

In an open circuit how much larger must the reservoir be compared to the size of the pump.

A

2 to 3 times larger

23
Q

What is a breather used for

A

It allows air flow in and out of the reservoir

24
Q

A inlet filter of a size of 100 micron is used for what?

A

100 micron filter is used to remove large contaminants

25
Q

In a water cooler (shell and tube heat exchanger) the symbols for cooling, heating or a combination of the two look like what?

A

Arrows point outward for cooling

In-ward for heating

And the same direction for heat and cooling

26
Q

Is a closed reservoir that’s sealed from the atmospheres pressure, below or above atmospheric pressure

A

Above 1-3psi

27
Q

What micron sizes do the most damage in a hydraulic system

A

25/22/19

4,6,14

4u 6u 14u

# of Microns in a milliner sample 
- lower is cleaner
28
Q

What is the main cause of cavitation

A

Reduced inlet flow

29
Q

You have installed a flow meter in the return line of a circuit you notice the flow fluctuating as you actuate the DCV

This is due to

A

Measuring return flow of cylinder

30
Q

Which control system for the proportional DCV uses a linear displacement transducer to compare the actual position of the actuator to the set position

A

Closed outer loop

31
Q

What are the four basic test instruments required for trouble shooting a hydraulic system

A

Pressure gauge
Flow meter
Tachometer
Thermometer

32
Q

To the set the speed of an actuator in a proportional DCV, what would you adjust on the amplifier card.

A

Ramp function

33
Q

If you adjust load sensing compensator on a pump what will you effect

A

Stand by pressure

34
Q

If you adjust the pressure limiting compensator on a pump what do you effect

A

Max operating pressure

35
Q

In the circus you have installed a set of pilot to open check valves to lock a horizontal cylinder

While testing the cylinder becomes hydraulically locked

A

The ratio of the pilot to open check is less than the ratio of the cylinder

36
Q

Hydraulic cylinder load won’t move, what is the cause of this.

A

Relief valve is set to low

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