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38 Cards in this Set
- Front
- Back
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Motor spools are used for what type of actuator? Why? |
Hydraulic. So they can safely decelerate |
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Cylinder spools are used for what type of actuator? Why? |
Cylinders. Holds load in neutral |
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What kind of force does a cylinder use? |
Linear |
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What kind of force does a motor use? |
Rotary |
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What are power logic valves and why are they good? |
Electronic valves. Faster, more efficient, no cylinder creep |
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What does load check valve do? |
Keeps load from falling |
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When does load check valve work? |
When load is first activated |
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What port is load check valve located in? |
Pump port |
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What do all DCVs' do? If it's excessive, can the cylinder drift? |
Leak internally and drift |
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If you have a cylinder drifting in neutral position, what is usually wrong? |
Cross port relief valve |
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Where should test equipment be installed? |
In the correct location |
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How do you know what the pressure ratings are? |
They are max system pressure |
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What does orbitrol steering valve control? |
Distance and speed of actuator |
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Where does fluid go in neutral postion? |
Tank |
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What happens if the OSV quits working? |
Goes through check valve and runs through gear rotor pump |
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What keeps a cylinder from getting damaged and prevents cavitation? |
Cylinder port relief valve |
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What is the difference between a cross port relief valve and a cylinder port valve? |
CPRV protects 2 circuits, CPV protects 1 |
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How can you actuate a DCV? |
Mechanical, electrical, pneumatic, hydraulically |
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What does a DCV do? |
Directs flow |
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Cross port relief valve- what are they for? |
Prevents overload damage and cavitation |
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At what temp do you want the oil in the system to be when you do inspection? |
Operating temperature. Cold fluid mask leaks |
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What are the lands for on a spool? |
Control fluid through ECV |
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What are metering notches for? |
Smoother DCV operation |
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What are the grooves for on the lands? |
Makes then hydroplane |
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What is pilot control? |
Small controls big |
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What else can you call the neutral position? |
Hold position |
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If you have a hydraulic problem, will it be obvious if the fluid is cold or hot? |
Hot |
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Detent |
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Lever actuated |
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Button actuated |
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Solenoid actuated |
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Pilot operated |
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Ball valve |
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Spring |
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Tandem |
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Open center actuator |
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Float center actuator |
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Closed center actuator |
