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P.M.
Proactive Maintenance basics
Question | Answer |
---|---|
In a hydraulic system filters can be located? | Anywhere they are needed to guard against expensive downtime, for safety or to ensure proper operation of Servo or Proportional valves. |
Oil contamination can come from four sources what are they? | New oil, ingressed, internally generated, and improper maintenance proceedures. |
Typically a cooler in a hydraulic system has an avererage Delta T temperature drop across the cooler of about 10 degrees. What could cause an increase in temperature across the cooler? | External restri8ction to air flow, internally blocked cooler cores, High Ambient temperatures, High pressure internal leakage. |
The purpose of oil in the hydraulic system is to? | Seal cool Lubricate and transmit power. |
when getting an oil sample from an active machine the sample should be taken where? | Ahead of the return filter. |
When cleaning a suction screen inlet filter the technician should? | Clean with ispropyl Alcohol use an ultrasonic cleaning machine and use compressed air to blow from the inside out to remove dirt and cleaning agents left in the screen. |
When should filters and oil be changed in a hydraulic system? | According to the operators manual maintenance schedule, or oil sample analysis to determine if the cleanliness and/or additive package compoents of the oil are breaking down, or in severe duty applications as often as needed. |
the Beta ratio tells the capability of? | A filters ability to remove contamination from the oil stream. The higher the number the more efficient the filter. |
Cavitation in a pump causes? | Fluid voids that implode breaking away surface material creating premature failure. |
Some Internal leakage in a hydraulic system is acceptable and used for? | Sealing, Cooling, Lubrication. |
In a hydraulic system is External leakage acceptable? | No! |
Water, Dirt, Varnish, Foul smelling oil, Foam or discolored oil in a reservoir indicates the need to? | Sample the oil to see what is in it, Change filters, check the machine for faulty hydraulic components and Drain, Flush and Refill the tank. |
In a catastrophic failure fragments can? | Migrate to other components causing sever parrallel damage throughout the system. |
An intermittant Failure can cause? | Erratic operation causing the machine to become unreliable. |
A Degradation failure is? | Progressive wear over time creating high pressure leaks causing the operating temperature of the fluid to increase. |