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Theory 4 > Hydraulics > Flashcards

Hydraulics Flashcards

1
Q

Fluid definition

A

• It is a substance that will readily take the shape of its container
• It is capable of transmitting power
• It can be a liquid or gas

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2
Q

Area

A

Area of piston face

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3
Q

Force

A

force acting on a piston / force transmitted by a piston

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4
Q

Pressure

A

pressure exerted on the system fluid

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5
Q

Equation

A

F = A x P

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6
Q

Name the Advantages of Hydraulics

A

It is reliable

Simple and easy to understand

Infinite speed range

Easily reversed

Ability to withstand overload

No spark risks

High torque at low speeds

1/12 size of equivalent electric motor

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7
Q

Name the Disadvantages for Hyrldraulics

A

• Fire risk with mineral oil systems
• Noise
• Risk of contamination
• Less efficient (85-95%)

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8
Q

Why should denso steel working mastic and pvc self adhesive tapes be stored on the upper deck?

A

Because when ignited they give off toxic gasses

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9
Q

Where is tape stored

A

Flammable store

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10
Q

Pipework sealing joints carry….

A

O rings

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11
Q

What are o rings wlmade from

A

Fluorocarbon elastomers

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12
Q

At what temperature does fluorocarbon give off a toxic gas?

A

Above 300’C

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13
Q

What is the gas that is given off by fluorocarbon at extreme temperatures?

A

Hydrogen Fluoride

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14
Q

Name all the fluorocarbon elastomer PPE

A

• PVC gauntlets
• Rubber boots
• PVC coveralls
• Full-face visor

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15
Q

Name the 2 types of Hydraulics fluod

A

Petroleum based
Synthetic Based

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16
Q

What is petroleum based hydraulic fluid?

A

Petroleum based oils are general purpose (inexpensive) mineral oils.

17
Q

What is synthetic based hydraulic fluid?

A

Synthetic oils are man-made, for specific purposes.

18
Q

Name the 3 oils used

A
  1. OM33
  2. OX30
  3. OX40
19
Q

What is OM33 used for?

A

Yellow / Orange colour

Used in T42s T22s and CVS

20
Q

What is OX30 used for?

A

Red

Used on subs

21
Q

What is OX40 used for?

A

Green

T23s T45s

22
Q

What is rust veto?

A

used during upkeep periods where hydraulic oil has been removed from a system.

Rust Veto is put in as a substitute for the hydraulic fluid to prevent corrosion.

23
Q

Name the requirement of hydraulic fluid

A

• The main requirement of a hydraulic fluid is for the transmission of power
• The fluid must flow easily through lines
• It must be as incompressible
• Lubrication is another important requirement
• Sealing Properties
• Cooling is another role for hydraulic fluid.

24
Q

The most common causes of contamination are…

A

· Airborne particles and moisture

· Construction dirt

· Dirt in new fluid

· Dirt produced by wearing in new system

· Dirt from human sources

25
Q

Name the methods of reducing contamination

A

• Good system design
• Filtration and filter maintenance
• Operation of filter and clogging indicators
• Good working practices
• Use of Guardian filter pack
• Caps should be fitted to open pipework
• Clean working area

26
Q

Draw the Hydraulic System

A

Draw the Hydraulic System

27
Q

The Hydraulic System will generally have 3 sets of pipework, name them

A

Pressure, Supply, Drain

28
Q

What does the drain leg do?

A

returns oil that has been used for Cooling, Sealing and Lubricating

29
Q

Name the types if hydraulic pump

A

Axial Piston
Positive displacement

30
Q

Name the types of Positive displacement pump

A

• Internal gearwheel type
• External gearwheel type
• Vane type
• Lobe type
• Radial piston type
• Axial Piston Pump (These types of pump use a Swash Plate)

31
Q

Where are axial piston pumps used

A

Stabiliser systems

CPP systems

Steering systems

32
Q

What does an actuator do?

A

Actuators convert hydraulic energy (system pressure) into mechanical motion

33
Q

Name the 2 types of Actuator

A

Linear, Rotary

34
Q

Name the 2 types of linear actuators

A

Single, Double Acting

35
Q

What is an accumulator

A

a device in which potential energy is held under pressure.

36
Q

Where are accumulators used?

A

They are useful in fluid power systems to store energy and to smooth out pulsations. They are used as a surge or pulsation dampener or absorber.

37
Q

Hydraulic System symbols

A

Hydraulic System Symbols

38
Q

Why are anti oxidants added to oil?

A

Prevents it turning thick, and sludgy

39
Q

Demulsibility Meaning

A

Ability to separate water

Theory 4 (4 decks)

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