A substance that will readily take the shape of its container
Capable of transmitting power
Can be liquid or gas
1 of 19
What is the equation triangle for hydraulic multiplication ?
/\
/ F \
/----\
/A / P\
2 of 19
List 8 advantages of hydraulic systems.
1.Relaible 2.Simple and easy to understand 3.Infinite speed range 4.Easily reversed 5.Ability to withstand overload 6.No spark risk 7. High torque at low speeds 8.1/12th the size of equivalent electric motor
3 of 19
List 4 disadvantages of hydraulic systems.
1.Fire risk of mineral oil
2.Noise
3.Risk of contamination
4.Less efficient(85-95%)
4 of 19
What PPE should be worn when working around fluorocarbon elastomers ?
PVC Gauntlet gloves
Rubber boots
PVC Coveralls
Full face visor
5 of 19
What are the two types of hydraulic fluid and there uses ?
Petroleum based: General purpose and inexpensive
Synthetic based: Made for a specific purpose and expensive
6 of 19
What are the three oils in use and what colour are they ?
What are the 3 other properties hydraulic fluid must have ?
Lubricating
Sealing
Cooling
8 of 19
What are the 5 most common causes of contamination in hydraulic fluid ?
Airborne particles and moisture
Construction dirt
Dirt in new fluid
Dirt produced by wearing in new systems
Dirt from human sources
9 of 19
List 7 methods of reducing contamination.
1. Good design 2. Filtration and filter maintenance
3. Operation of filter and clogging indicator 4. Good working practices 5. Guardian filter pack 6.Caps on open ended pipes 7. Clean working area
10 of 19
What 3 sets of pipe work are used in hydraulic systems ?
Pressure supply
Pressure return
Pressure drain
11 of 19
What kind of pumps are used/Required in a hydraulic system ?
Hydraulic systems require high pressure positive displacement pumps.
12 of 19
List 6 types of pump that can be used in a hydraulic system.
External gear pump
Internal gear pump
Vane pump
Lobe pump
single piston pump
multi piston pump
13 of 19
List 4 advantages of a multi piston pump.
Highly efficient
Have a wide range of capacities
Variable output
Large HP applications
14 of 19
What is the purpose of the drain leg ?
Allows the oil used for cooling and sealing to return to the tank.
15 of 19
What is the purpose of an accumulator ?
It is used to retain energy and smooth out pulsations.
16 of 19
What is connected to a shaft to control the pistons in an axial piston pump ?
A swash plate is used to control the pistons on an axial piston pump.
17 of 19
How is a variable flow and bi directional flow achieved in an axial pump ?
Variable/bi directional flow is achieved by changing the angle of the swash plate.
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What equipment uses a variable/ bi directional flow axial pump ?
Stabiliser systems
CPP Systems
Steering systems
19 of 19
Other cards in this set
Card 2
Front
What is the equation triangle for hydraulic multiplication ?
Back
/\
/ F \
/----\
/A / P\
Card 3
Front
List 8 advantages of hydraulic systems.
Back
Card 4
Front
List 4 disadvantages of hydraulic systems.
Back
Card 5
Front
What PPE should be worn when working around fluorocarbon elastomers ?
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