HYDRAULICS AND SYSTEM TROUBLESHOOTING · PDF fileTrainin wwNTTIncco HYDRAULICS AND SYSTEM...
Transcript of HYDRAULICS AND SYSTEM TROUBLESHOOTING · PDF fileTrainin wwNTTIncco HYDRAULICS AND SYSTEM...
800.922.2820 | www.NTTInc.comTraining
HYDRAULICS AND SYSTEM TROUBLESHOOTINGLearn the basic hydraulic components, how they work, and their function in a hydraulic circuit. You will be able to understand and interpret hydraulic schematics, and implement safe work practices.
The extreme flexibility of hydraulic elements can create a number of problems. Participants learn how fluids must be positively confined through the entire system and prevented from going anywhere except where we want them to go.
There is no magical way to troubleshoot a hydraulic system; it is the logical analysis of basic facts and principles. Through the hands-on hydraulic trainers you will construct, operate and troubleshoot systems using common hydraulic components.
COURSE AGENDA HYDRAULIC PRINCIPLES• Pressure and force• Advantages and disadvantages• Physicalpropertiesofliquids• Measurement and scales• Pascal’s Law• Horsepowerandtorque
HYDRAULIC PUMPS• Positive-displacementofpumps• Increasing/decreasing volume• Gear/van piston/screw pumps• Troubleshootingcavitation,entrainedair,effects
of varnish and sludge
FLOW, PRESSURE AND DIRECTIONAL CONTROL VALVES• Flowcontrols,actuatorspeed,andorifices• Hydraulic circuit/placement• Relief/sequence/counterbalancevalves• Pressure-reducing valves• 3-positiondirectionalvalvesymbols• Solenoids-controlled, pilot-operated valves• Measuring surge pressure
HYDRAULIC CYLINDERS• Singleanddoubleactingcylinders• Seals• Cylindertypesandconstruction• Flowrequiredbycylinders• Regenerativecircuit• Troubleshootingcylinders
CLASS FORMAT:Lab + classroomTheparticipantisableto“learn-by-doing”inthecourse;this knowledge can be transferred to the workplace.
STANDARD CLASS SIZE:NTTrecommendsaclassof12participantstoobtainthe best results.
NTT TO PROVIDE:• 4-days(32contacthours)ofon-siteinstruction• Textbooks and lab manuals, • Classroom consumables• Completioncertificates• Shipping, instructor fees and travel expenses
CLIENT TO PROVIDE:• Classroom,witheasyaccess,of750squarefeet
or greater• Projectionscreen,whiteboardand/orflipchart(s)• Adockfacilityoraforklifttounloadthetrainingequipment
• Apalletjacktomovethecratesaroundaftertheyhave been unloaded may also be needed
• Theequipmentshouldbeplacedinthetrainingroomfor the NTT instructor to test and set up prior to the start of training
SHIPPING:3 crates: •2crates@38”x52”x81”(1,150lbs.each)•1crate@38x58x57(750lbs.,cavitationunit)
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HYDRAULICS AND SYSTEM TROUBLESHOOTING
COURSE AGENDA, continued
HYDRAULIC MOTORS• Speedandtorque• Types and sizing of hydraulic motors• Hydraulic motors in circuits• Hydrostatictransmission• Applicationsofrotaryactuators
ACCUMULATORS• Applications,sizing,andcharging• Installationandoperatinginstructions• Gas precharge pressure
HYDRAULIC FLUIDS• Propertiesandtypesfluids• Fire-resistant/biodegradablefluids• Fluid storage and handling
FLUID CONDUCTORS• Hydraulicfluidconductors• Steel pipes and tubes• Flexible hose• Fluidvelocities• Friction/restrictionsinfluidlines
RESERVOIRS, HEAT EXCHANGERS AND FILTERS• Contaminationcontrol• Detection
TROUBLESHOOTING—BASIC REQUIREMENTS• Componentfunctionandoperation• Hydraulic symbols
PRINCIPLES OF MOTION AND FORCE• Movementandspeed—flowrate• Flow pressure
SOME GENERALIZATIONS• New vs. old systems• The major cause of failure• Diagnosticequipment
NOISY PUMPS OR CAVITATION AND AERATION• Low pressure/entrained air• Vacuum, foaming, and air leaks
LOW, ERRATIC OR NO PRESSURE• Wrongrotationofpump• Relief valve or compensator• Low reservoir level
CONTAMINATION IN VALVES NO MOVEMENT OF ACTUATOR• Malfunctioningpumps• Lack of pilot pressure• Incorrectplumbingconnections• Solenoid problems• Wrong temperature or motor speed
NOISE CONTROL• Lowernoisegeneration• Isolatingnoise
CYLINDER & CIRCUIT PROBLEMS• Erraticorjerkmotion• Blown rod seals, cylinders, or plumbing• Cylinderdrift
SOLENOID FAILURE• Coil burnout• Mechanicaldestruction• Life expectancy
LEAKAGE CONTROL• Flaretypefittings• Straight and tapered threads• O-ring failures
TROUBLESHOOTING GUIDE• Test set up and procedures• Fixed displacement motor• Variable displacement pump
800.922.2820 | www.NTTInc.comTraining
HYDRAULICS AND SYSTEM TROUBLESHOOTING
COURSE AGENDA, continued
HANDS-ON LAB EXERCISES• NTTtrainerfamiliarization• Flow control types• Meter-inflowcontrol• Meter-outflowcontrol• Bleed-offflowcontrol• Two-speed control• Sequencingcircuit• Sequencingwithflowcontrol• Remotepilotofsequencevalve• Pressurereducingwithsequencing• Pilot-operated relief• Regeneration• Differentialvolume
UsingNTT’sspeciallydevelopedhands-ontrainingstations,participantsbuildandoperatenofewerthan14differentcircuits.
Participantsseefirst-handhowproblemssuchascavitation,aeration,erraticpressure,lossofpressureorflowshortencomponentlifeandinfluencesystemfailures.