Hydraulics 1

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The difference between an unbalanced vane pump and a balanced vane pump is the

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Cavitation could occur when

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A pneumatic accumulator is pre-charged with

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An open center system can best be described as one in which

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A four connection (four way) spool valve is used in conjunction with a

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Viscosity can best be describe by

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The inlet hole size of a hydraulic pump should

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The force developed by a cylinder is calculated by

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The most likely cause of a decreased hydraulic actuator speed would be

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Hose #SAE100R2AT-8. The dash number used for sizing hydraulic hose refers to its inner diameter in

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When making up a hose that requires the end to be skived to install the replaceable fitting, the amount skived is

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When flow and pressure testing a piece of equipment, the flow rate is best defined as

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A cylinder tends to creep down when stopped in mid-stroke. The control valve checked out as operational and there is no external leakage. The next thing to check for would be

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Before a hydraulic system is ready to be worked on, the mechanic must

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To detect pin-hole leaks in hydraulic lines, you should

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When the fluid in a hydraulic system appears gray and milky, the problem is likely to be

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When replacing a hydraulic pump you should

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Hydraulics is defined as the use of

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Tubing is sized or gauged by its

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Upon inspection of a failed hose, it is found that the inner core is cracked and the hose is hard and stiff. The probable cause of failure would be

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A truck owner complains that his power steering works fine but is overheating. The oil level is correct and the fluid appears clean and clear. What would you do next?

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One of the basic principles which makes hydraulic action almost instantaneous is that liquid is:

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A double acting cylinder is a device that converts fluid power into

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Hydraulic pumps are rated in terms of

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The pressure setting of the relief valve is controlled by a

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Directional control valves

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A hydraulic motor is driven

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The most frequent cause of hydraulic pump failure is the use of dirty or poor quality oil.

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CAVITATION is the mixing of water and oil.

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Water in hydraulic oil will give the oil a clear look.

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A plugged reservoir air vent may cause the hydraulic pump to make a noise.

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An orifice creates a pressure drop in the hydraulic circuit.

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If the down stream side of an orifice is blocked, the pressure will equalize on each side of the orifice.

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Slight leakage at a dynamic seal is permissible for seal lubrication.

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Air in the system will cause the system to operate slowly.

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Low oil level could cause foaming of oil in the hydraulic system.

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Dirt in the relief valves will cause high oil pressure.

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One disadvantage of an engineered hydraulic system is that it is subject to leaks from high pressure and from shock loading.

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An accumulator may be used in a system to store energy.

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A good safety practice to follow when you begin any troubleshooting or service work on a hydraulic system is to have a container to catch hydraulic fluid.

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If you are working on equipment manufactured by Caterpillar, it is valid to assume that the hydraulic components will be standard Caterpillar components.

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On a troubleshooting job, why would it be important to take mechanical drawings for a piece of equipment as well as the hydraulic schematic?

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Cause of a power source problem might well be the fault of

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When using the flow meter to test the pump, connect the outlet port of the tester to the pressure line.

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Most flow meters test for

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Flow meters have a load valve on them. Before starting the equipment to run tests, the load valve should be

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On most pumps, satisfactory pump flow at maximum pressure should be at least as high as

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If a load drops when the control valve is in neutral position, it might be caused by

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The most reliable source of information regarding the tests and specifications for a given piece of equipment is the

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If a pump is cavitating, it may be an indication of

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Hydraulics 1
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