Hydraulic Troubleshooting Flashcards
To what type of energy does a hydraulic system convert electrical energy?
Chemical
Heat
Static
Usable
Usable 
What is the function of a control valve in a hydraulic system?
Directs fluid
Regulates pressure
Regulates flow
All of the above
All of the above
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
Lubricate the system 
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
Understand the systems operation 
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
Have all components installed correctly
Which of the following types of drawings illustrate the general location and appearance of a systems elements?
Cutaway
Pictorial
Schematic
All of the above
Pictorial
What type of drawing illustrates the elements that make up a hydraulic system?
Cutaway
Line drawing
Schematic
All of the above
Schematic 
On a schematic, drawing hydraulic components are represented by
Color coding
Cross-section drawings
Symbols
Trademarks
Symbols 
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
Obtain an overall view of the system

A schematic drawing of a hydraulic control valve illustrates fluid flow, and
Fluid temperature
Fluid pressure
Port size
Valve function
Valve function 
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
Are required for each component
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 
Provide a flexible coupling 
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
Jog the drive motor 
A stack of hydraulic control valves held together by bolts is called a
Manifold
Power pack
Reservoir
Solenoid
Manifold 
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 
Clip off the leads at the valve 
Pump suction, or inlet pipes should always be equal to, or larger than the
Pump intake
Return lines
Suction strainer
Suction filter
Pump intake
Which of the following must be considered when selecting hydraulic tubing?
Material
Tube ID
Wall thickness,
All of the above 
All of the above
Which of the following should be avoided when assembling tubing
Additional supports
Straight line connections
Tube Bends
All of the above
Straight line connections 
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
Wears out more quickly than tubing
Which of the following best describes most seals used in hydraulic components?
Pre-energized
Preformed
Pre-lubricated
Prepackaged
Preformed
What is the primary function of a hydraulic fluid?
Absorb shock
Create pressure
Lubricate the system
Transmit force and energy
Transmit force and energy
The lubricating capability of a hydraulic fluid is dependent, mostly upon It’s
Antifoam agents
Rust inhibitor’s
Temperature stability
Viscosity
Viscosity
Which of the following items affects hydraulic fluid viscosity the most?
Additives
Operating speed
Temperature
Viscosity index
Temperature
When you select a hydraulic fluid, always make sure it is
Compatible with the system
Fire resistant
Free of additives
Nontoxic
Compatible with the system
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

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
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
After how many operating hours should the fluid in a hydraulic system be sent out for laboratory analysis?
100
500
1000
1500
1000

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
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
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
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
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
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
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
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
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 
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 
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
Which of the following tells how directional control valves should always be reassembled?
Carefully
Connected to the pump
Quickly
All of the above
Carefully 
Cylinder rod misalignment is usually caused by
A pivot-mounted cylinder
Excessive pressure
Insufficient pressure
Side loading
Side loading
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 
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
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
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

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 
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

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

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
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 
