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Agri Tech 25 > Hydralic Princables > Flashcards

Hydralic Princables Flashcards

1
Q

What does a steering orbital do

A

Allows for assistance in steering larger vehicles and allows a fixed steering system even if the machine is inoperable

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2
Q

How does a steering orbital spring back into place

A

Using leaf springs which also create steering resistance

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3
Q

What does open centre mean

A

It means always working

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4
Q

What is flow

A

Cause by difference in pressure at 2 points

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5
Q

What is velocity

A

It is average speed of which particles pass a point

Speed in a given direction

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6
Q

What is flow rate

A

Volume of liquid passing a point at a given time

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7
Q

What is laminar flow

A

Flow which is smooth and uninterrupted

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8
Q

What is turbulent flow

A

Flow which is irrational and causes heat to form

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9
Q

Does pressure drop after an orafice

A

Yes because the pressure is build up before the orafice, once it passes it drops down

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10
Q

How does Bernulies princable work

A

As pressure decreases above an object velocity will increase and pull it up

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11
Q

If on a hydraulic schematic an object is in a dotted box what does this mean

A

It is one component

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12
Q

What does a fluid conditioning device look like on a schematic

A

It is a square

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13
Q

What does a closed centre drawing look like

A

All ends are closed off nothing is working

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14
Q

What does an open centre drawing look like

A

It is like an open goal or a big h all working

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15
Q

What does a tandem drawing look like

A

It is a crying clown bottom 2 are connected and top 2 are capped off

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16
Q

What does a float centre drawing look like

A

It is a 4 all are allowed to connect other than the pump therefore making it float

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17
Q

What does a rotary device look like on a schematic

A

It is a circle

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18
Q

If the arrow points in on a rotary device what does this make it

A

A motor

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19
Q

What does it mean if there are 2 arrows on a rotary device

A

It means it is bidirectional

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20
Q

What would be written on a pump rating plate

A

Max discharge pressure PSI
flow output at max driven speed LPM
and displacement per pump shaft revolution CCM

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21
Q

What does a pump do

A

Convert mechanical energy into hydraulic energy

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22
Q

What does a hydraulic motor do

A

Convert hydraulic energy into mechanical energy

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23
Q

What is a positive output pump

A

A pump which has the same output as input

24
Q

What is a non positive output pump

A

It is a pump which can be stalled/ load can overcome the output and output will be slower/ not the same

25
Q

What is a variable pump

A
26
Q

What pump can be fixed and variable

A

A vane pump

27
Q

What is an open loop hydraulic circuit

A

It is from reservoir to reservoir

28
Q

What is a closed loop system

A

It has no reservoir the oil is always stuck in one system

29
Q

What is the minimum volumetric efficacy a pump should be giving out

A

60 percent

30
Q

What is a closed centre system

A
31
Q

What is cavitation

A

It is small pockets of nothing where molecules split and stretch causing pitting due to lack of oil

32
Q

What is aeration and how do you find it

A

It is when air gets into a system causing sponginess , foam and bubbling this can be found by finding the hole using oil and seeing it bubble

33
Q

What is swash plate cavitation

A

It is where demand exceeds supply and it runs the plate dry or low on oil causing lack of oil and therefore pitting on components

34
Q

How do you know how efficient a hydraulic pump is being

A

Check the rating if the spec is 20 gpm and the pump is giving out 16 it is 80 percent efficient

If it is low check filters and oil to perhaps improve efficacy

35
Q

What is a pressure control device and what does it do

A

It limits maximum pressure, provides redirection of pump flow when it must be maintained ( unloading )
It also provides redirection while not maintained ( off loading )
Alternate flow for pressure seqencing
Reduce or step down pressure for a sub circuit

36
Q

What is an example of a pressure control device

A

Relif valve / unloding valve / pressure seqencing valve / pressure reducing valve / counter balance valve

37
Q

What is cracking pressure

A

It is the pressure needed to overcome the spring to release oil

38
Q

What is a compound relief valve

A

2 relif valves in 1 one small one big to allow for surges

39
Q

What is a sequencing valve

A

It is a pressure relief valve which allows a next circuit to work after that one has pressurised

40
Q

What is a pressure reducing device

A

It is a device which always ensures pressure is correct for a component

41
Q

What is a counter balance valve

A

Allows rhe system to be smooth and predictable with unexpected loads, using a solenoid , it is variable

42
Q

Why would you use nitrogen in an accumulator

A

Because it is inert and safe

43
Q

What does an attenuator do

A

It reduces noise and pulses through a system

44
Q

What makes a cylinder non differential

A

It means it can put more force outward than inward due to surface area of cylinder

45
Q

What is the difference between a ram and cylinder

A

A ram is bigger than 50 percent of the housing

46
Q

How would you know a pilot check valve is broken

A

It will creep as valve should block flow until other is opened

47
Q

What is drift rate

A

It is how fast a cylinder will drop if left with load on it

48
Q

What is cycle time

A

It is how long it takes for a ram to power out and retract

49
Q

What is the iso number for hydraulic oil cleanliness

A
50
Q

What are 2 simple checks for a hydraulic front loader

A

Drift rate and cycle time

51
Q

What way do the arrows face on a oil cooler

A

Facing out

52
Q

When referring to a planetary gear transmission how could Infinitely variable gear range be achieved

A

By adding a hydraulic motor and pump

53
Q

How is direct drive achieved in a planetary carrier

A

Locking 2 components together

54
Q

How is reverse achieved in a planetary gear set

A

Holding the planetary carrier

55
Q

What is a hydraulic filter clearance

A

5 ųm

56
Q

What is a hydraulic system clearance

A

5 to 13 microns

57
Q

What can hydraulic injection cause

A

Gangrene

Agri Tech 25 (18 decks)

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