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14 Cards in this Set
- Front
- Back
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Which two electrical lockouts must you perform before you work on a hydraulic system |
Pump power supply Control power supply |
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What safety precaution must you take before working on a hydraulic system that supports a suspended load |
Lower the load onto mechanical supports |
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What precaution must you take before working on a system with an accumulator |
Drain the accumulator, bleed down, depressurize |
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How can you be sure that the system is safe to work on after you have depressurized it, installed all the lockouts and supported all the suspended loads |
Attempt to cycle the system |
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What is the procedure for safely undoing a bolted hydraulic flange |
Undo the bolts that are away from the side at which you are standing |
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Why should lines between the valves and the actuators be as short as possible |
For quick accurate control |
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What is the basic cause of aeration |
Air leaks |
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What is the basic cause of cavitation |
Reduced inlet flow |
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What should you do to fix a cylinder that is squealing and has jerky operation |
Bleed the air off at the fittings and then tighten them securely |
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Why are pinhole leaks in a hydraulic system dangerous |
A jet of high pressure oil can enter your blood stream |
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What safety precaution must you take before manually overriding a directional control valve |
Ensure that you and others are in a safe position and no damage can be done to the equipment |
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When you first start up a system after you have installed a relief valve, the pressure adjustment screw should be turned |
All the way out |
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What are the four basic test instruments that you need to troubleshoot systems |
Pressure gauge Tachometer Flow meter Thermometer |
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How can an electric particle counter be used to trouble shoot a system |
To detect component wear |
