Hoses Flashcards
When does the service life of the hose begin
When the hose is installed into the system
The outer layer of hydraulic hose protects against what
Abrasions and UV rays
Before putting into service what do you test hydraulic hose to
Twice the rated working pressure for 5 mins
Contamination causes what percentage of hydraulic failures
80%
Downside to a meter out hydraulic circuit is what
Pressure intensification
A filter 5A-10 will remove what percentage of contaminants
90% of contaminants that are 5 microns or larger
Max leakage for a crew type hydraulic pump
50ml per day
Water liquid contaminants in a hydraulic system
100PPM preferred
500PPM max
What do you see when you have to much water in your hydraulic fluid
Emulsification
Most common type of hydraulic fluid
Petroleum based
Hose life of standard hydraulic hoses exposed to the sun and rain
5 years
Functions of unloader in hydraulic system
Unload pump to the reservoir at a low pressure or pressure much less then relief valve when pump flow is not needed.
2 basic types of hydraulic unloaders
Vented and remote
Two uses for hydraulic unloaders
Limit max pressure and unload pump at a set pressure
What percentage working pressure do you test a temporary hose to
110% of maximum pressure the hose will be subjected to during temporary use
