Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
20 Cards in this Set
- Front
- Back
|
What condition can occur if the inlet strainer on a pump clogs |
Cavitation |
|
|
Under what conditions do you need a heater in a reservoir |
When the reservoir is exposed to temperatures too cold for the fluid to flow |
|
|
In addition to transmitting power, what four things must hydraulic fluids do? |
Lubricate Cool Seal Flush |
|
|
What is the main cause of oxidation in hydraulic fluid |
Heat |
|
|
List four harmful products of oxidation in hydraulic fluid |
Varnish Gum Sludge Acid |
|
|
How can you keep the contaminants in new oil out of a hydraulic system |
Use a filter cart to install the oil |
|
|
Name three ways contaminants which can get into a hydraulic system |
New oil Rod seals Shaft seals Loose fittings Reservoir breather |
|
|
What information does the code 18/16/14 give you |
18/16/14 represents a standardized ISO code for the number of particles at a given size |
|
|
Why should you use a strainer instead of a filter on the pump inlet |
A strainer offers less resistance to flow |
|
|
What is the purpose of a bypass on a filter |
To allow oil flow even when the filter is plugged |
|
|
How can you tell when you need to change a filter |
When the indicator shows that it is operating on bypass after warm-up |
|
|
What are the four locations for filters in a hydraulic system |
Pump inlet Pressure line immediately after the pump Return line Off-line |
|
|
Which type of filter should you use for the reservoir breather |
A three micron filter with a moisture trap |
|
|
Besides efficiency, which four specifications do you need when selecting filters |
Pressure rating Flow capacity Dirt holding capacity Fluid compatibility |
|
|
Is new oil clean enough to use in hydraulic system or do you have to filter it before you install it? |
Filter it before you install it |
|
|
What is a major source of built in contamination |
Tapered thread pipe fittings |
|
|
What causes generated contamination |
Moving parts in the system |
|
|
What three particle sizes are measured for ISO contamination level specifications |
4 microns 6 microns 14 microns |
|
|
Between petroleum-based fluids and non-petroleum based fluids , which type of fluid requires the highest cleanliness level |
Non petroleum based fluids |
|
|
Which filter in the system has to be rated at the relief pressure of the system |
The pressure line filter |
