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6 Month 3 > Hydraulic Troubleshooting > Flashcards

Hydraulic Troubleshooting Flashcards

(50 cards)

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1
Q

To what type of energy does a hydraulic system convert electrical energy?

Chemical
Heat
Static
Usable

A

Usable 

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2
Q

What is the function of a control valve in a hydraulic system?

Directs fluid
Regulates pressure
Regulates flow
All of the above

A

All of the above

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3
Q

The hydraulic fluid in a system must be able to transmit power, and

Compensate for wear
Lubricate the system
Provide a breaking force
Reduce fluid consumption

A

Lubricate the system 

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4
Q

Before working on a hydraulic system, the most important requirement is to

Be able to read schematic diagrams
Be able to repair all components
Have worked on the system previously
Understand the systems operation

A

Understand the systems operation 

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5
Q

If a hydraulic system is to function properly, it must

Be free of return lines
Be simple in construction
Have all components installed correctly
Have an oversized pump

A

Have all components installed correctly

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6
Q

Which of the following types of drawings illustrate the general location and appearance of a systems elements?

Cutaway
Pictorial
Schematic
All of the above

A

Pictorial

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7
Q

What type of drawing illustrates the elements that make up a hydraulic system?

Cutaway
Line drawing
Schematic
All of the above

A

Schematic 

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8
Q

On a schematic, drawing hydraulic components are represented by

Color coding
Cross-section drawings
Symbols
Trademarks

A

Symbols 

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9
Q

The first thing you do when you read a schematic of a hydraulic system is to

Count the number of components
Identify the easiest components
Locate all actuators
Obtain an overall view of the system

A

Obtain an overall view of the system


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10
Q

A schematic drawing of a hydraulic control valve illustrates fluid flow, and

Fluid temperature
Fluid pressure
Port size
Valve function

A

Valve function 

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11
Q

When installing hydraulic components, you should follow the installation techniques that

Are required for each component
Are the fastest
Relate to other components
Require the least number of tools

A

Are required for each component

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12
Q

In order to provide proper alignment between a hydraulic pump and the driving motor or you should always

Allow some end thrust on the pump
Mount the motor horizontally
Provide a flexible coupling
Use an oversized motor shaft 

A

Provide a flexible coupling 

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13
Q

Which of these procedures should be followed, when starting a newly installed pump

First run the pump without priming
Jog the drive motor
Pump into a charged system
Use hydraulic pipe dope for all connections

A

Jog the drive motor 

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14
Q

A stack of hydraulic control valves held together by bolts is called a

Manifold
Power pack
Reservoir
Solenoid

A

Manifold 

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15
Q

Which of the following statements about installing solenoid valves is not true?

Be sure the seals are clean
Check the valve, action mechanically
Clip off the leads of the valve
Is first turn on electric power 

A

Clip off the leads at the valve 

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16
Q

Pump suction, or inlet pipes should always be equal to, or larger than the

Pump intake
Return lines
Suction strainer
Suction filter

A

Pump intake

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17
Q

Which of the following must be considered when selecting hydraulic tubing?

Material
Tube ID
Wall thickness,
All of the above 

A

All of the above

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18
Q

Which of the following should be avoided when assembling tubing

Additional supports
Straight line connections
Tube Bends
All of the above

A

Straight line connections 

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19
Q

The disadvantage of using hydraulic hose and hydraulic system is that it

Always has a restricted opening
Is more difficult to install
Is not always available
Wears is out more quickly than tubing

A

Wears out more quickly than tubing

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20
Q

Which of the following best describes most seals used in hydraulic components?

Pre-energized
Preformed
Pre-lubricated
Prepackaged

A

Preformed

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21
Q

What is the primary function of a hydraulic fluid?

Absorb shock
Create pressure
Lubricate the system
Transmit force and energy

Study These Flashcards
A

Transmit force and energy

22
Q

The lubricating capability of a hydraulic fluid is dependent, mostly upon It’s

Antifoam agents
Rust inhibitor’s
Temperature stability
Viscosity

23
Q

Which of the following items affects hydraulic fluid viscosity the most?

Additives
Operating speed
Temperature
Viscosity index

24
Q

When you select a hydraulic fluid, always make sure it is

Compatible with the system
Fire resistant
Free of additives
Nontoxic

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A

Compatible with the system

25
Before filling a hydraulic system with hydraulic fluid, always make sure of the Amount of cooling required Reservoir capacity limits System being clean, Total system capacity
System being clean 
26
The interval of time between inspections on a specific hydraulic system, depends on the Number of lubrication points Other systems in the plant Physical size of the system Type of system 
Type of system
27
Because inspections are made to locate trouble before a breakdown occurs they are classified as  Periodic maintenance Preventative maintenance Repair maintenance Routine maintenance
Preventative maintenance
28
After how many operating hours should the fluid in a hydraulic system be sent out for laboratory analysis? 100 500 1000 1500
1000 
29
In many cases repair maintenance can be scheduled for a later time. Under what conditions should this procedure not be followed? When safety hazards exist When it occurs at the beginning of a production run When it occurs near the end of the shift When the department is on overtime
When safety hazards exist
30
When should hydraulic systems elements be reconditioned? Continuously Periodically and whenever they break down Whenever the fluids changed Whenever the filters are changed
Periodically and whenever they break down
31
Troubleshooting is best described as a means of determining trouble in a system by Low pressure cycling Means of logical sequence Observing a duplicate system Replacing the logical, faulty components
Means of logical sequence
32
Prior to troubleshooting a hydraulic system you should first evaluate the systems and then Determine the cause Order the necessary spare parts Repair of the problems as quickly as possible Take the machine out of production
Determine the cause
33
The best way to protect a pressure gauge from surges is by Disconnecting the gauge Installing a shut off valve Installing a plug valve Using a snubber with the gauge
Using a snubber with the gauge
34
When Are fluid flow meters or gauges most commonly used in a hydraulic system? During high pressure periods During installation During testing Whenever practical
During testing
35
Which of the following documents is most helpful in solving a hydraulic system problem? Maintenance record Manufactures part list Operators manual Work repair order
Maintenance record
36
The best way to determine if a valve is the cause of a system of function is to Inspect it for wear Replace the solenoid replace the valve Test the circuit
Test the circuit
37
whenever a valve is disassembled for inspection or repair. You should always. Coat it with preservative Hone out of the cylinder Replace the seals Rewire the solenoid
Replace the seals 
38
Which of the following causes sludge formation A bent valve stem A jammed valve Spool Low fluid viscosity Overheating of hydraulic fluid
Overheating of hydraulic fluid 
39
Which of the following could cause solenoid coil burnout in a directional control valve? Bent valve linkage Contaminants in the valve Excessive current flow All of the above
All of the above
40
Which of the following tells how directional control valves should always be reassembled? Carefully Connected to the pump Quickly All of the above
Carefully 
41
Cylinder rod misalignment is usually caused by A pivot-mounted cylinder Excessive pressure Insufficient pressure Side loading
Side loading
42
A probable cause of and unmovable or slow moving cylinder may be A blocked speed control valve An incorrect type of pump An oversized cylinder Excessive system piping
A blocked speed control valve 
43
Which of the following hydraulic fluids is suitable for fire resistant applications? Water-based fluids Emulsions Phosphate esters All of the above
All of the above
44
Before connecting a cylinder to the hydraulic system, you should first Clean the piping system Fill the cylinder with fluid Fill the reservoir Vent the pump
Clean the piping system
45
Which of the following items is essential to proper cylinder performance? Accurate mounting Piston rod boots Speed control valves All of the above
Accurate mounting 
46
Visual inspection of an operating hydraulic pump, or motor is limited because The high pressure is too dangerous The parts are moving too fast You cannot see the internal parts You cannot view the pump or motor from enough different angles
You cannot see the internal parts 
47
Broken pump rotors, fractured teeth, or vanes and repeated seal blowout are usually caused by. Excessive pump speed Insufficient lubrication Pressure shocks Relief valve set to low
Pressure shocks 
48
Excessive wear and roughness in a gear pump are indications of An undersized pump Poor manufacturing techniques Solid contaminants in the system Too large driving motor
Solid contaminants in the system 
49
It is important to keep all contaminants out of piston pumps because of the pumps Close-tolerance construction Inlet port sizes Soft iron pistons Speed of operation
Close, tolerance, construction
50
It is good and maintenance practice to replace which of the following when a hydraulic pump is repaired? Anti-friction bearings gaskets and seals Anti-friction bearings, gears and gaskets Gaskets shafts, and shaft seals Gears, gaskets, shafts, and relief valve
Anti-friction bearings gaskets and seals 

6 Month 3 (20 decks)

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