First Flashcards
Hydraulic systems convert the available power to blank power
Usable
Fluid acts as the carrier of hydraulic power through the system, but it also serves the important function of blank the hydraulic equipment
Lubricating
Before working on a system the most important requirement is
The first thing to do is to understand the operation of the basic machine or a piece of equipment on which the system is installed
What shows the general location purpose and appearance of these systems elements
Pictorial diagram
What shows both the positions of the elements in the circuit and how they operate
Cutaway diagram
So that you do not overlook an important detail and to help you reach the solution to the problem sooner what must you do
Get the overall view of the system
Valve symbols show connections, flow paths, and
Valve functions
Each major element in a hydraulic system has its blank that must be considered during installation
Own particular features
A blank should be used to connect the pump to the drive unit
Flexible coupling
Which procedures should be followed when starting a pump
?
Many people referred to blank as sandwich plates
Manifolds
When installing solenoids which of the following is not true
Clip off the solenoid leads
Inlet piping is extremely important the diameter of the pipe should not be smaller than the blank of the blank
Intake of the pump
The three principal considerations in selecting tubing are
Material, ID, and wall thickness
Lines should normally be kept as short and free of bends as possible. However, tubing should not be assembled in a straight line, a band helps eliminate what
Strain by absorbing vibration
What is a disadvantage of hose
It wears out more rapidly than either pipe or tubing
The lubricating properties of a fluid are largely dependent upon its
Viscosity
The primary function of a hydraulic fluid is to transmit efficiently the blank and blank applied at one point in the system to the point where they required mechanical action is produced
Force and energy
Before filling a system take precautionary steps to ensure the blank before installing the new fluid
Cleanliness of the system
How often you inspect, what you inspect, and what you inspect for depend on what
Type of system
Many companies find it best to completely recondition a system blank when it has run for two or more years or when it
Periodically and breakdown
When should you check and service hydraulic fluid
Every 1000 hours for contact to be sent for lab analysis
When working on hydraulic systems personal blank should never be sacrificed for production
Safety
One of the first things to do when the hydraulic system breaks down used to study the most recent history of its operation and performance the second step is to evaluate the symptoms to determine the blank of the present malfunction
Cause
Gauges are also equipped with the bases called blank which keep the needle from fluttering and absorb surges of pressure to protect the gauges
Snubbers
Flow meters are used for blank and monitoring purposes
Testing
The first step is to take out the blank blank for that machine and learn some thing about its operation
Maintenance folder
How do you determine a valve is bad
Test the circuit
Misalignment created by excessive blank blank causes the cylinder to bind and become inop
Sideloading
If the metering orifice is blocked or restricted, the fluid will not be allowed to pass freely through the valve, and the cylinder will not move or will move very slowly, what type of valve is this
Speed control valve
Fire resistant fluids the most popular types are water base fluids, emulsion fluids, and phosphate ester fluids
All the above
When installing a new cylinder do this before you connect the cylinder
Blow the pipe and fittings clean
Why is it difficult to troubleshoot a hydraulic pump or motor in service
Visual inspection’s water pump is an operation on limited because it is covered
What may cause other failures such as a fractured pressure ring
Pressure shocks
Excessive wear scratches or roughness mean that blank blank have been introduced into the pump
Solid contaminants
If contaminants are allowed to get into the pump their presents shows up very quickly because of why
Close tolerance between pump parts
When any type of gear pump all motor is being repaired it is a good general practice to replace what
Anti-friction bearings, shaft seals, and gaskets
Wear in a vane pump can be reduced to a minimum by using the proper
Fluid
In a variable displacement pump the circular ring movement is controlled by a pressure
Compensator
When it reinstalling sleeve bearings be sure to line up to lubrication
Grooves or slots
Name the two types of vein pumps
Constant displacement, variable displacement
The only control used with a constant displacement gear pump is an occasional
Relief valve
A variable displacement pump does not require a relief valve because the pump can
Shift to a no flow position
When troubleshooting a hydraulic pump, which of the following should you do last
Disassemble the pump and inspect the components
