Structured Flashcards
Explain Hall effect steering angle sensor and how to test it
Use a multimeter to test resistance, when angle changes resistance should change
What are inputs for auto guidance
Wheel speed, wheel angle, steering wheel angle, satellite signal strength
Describe hydralic system and reason for filter
N/a
How could you identify a pnumatic system air leak
Pressure gauge, measure pressure at different points in system, soapy water, listen to it
ISO number for oil cleanliness, what factors can allow contaminants in a system
Iso4406, contaminants can enter through scvs, or servicing
Precautions when working on a pneumatic system
Wear ppe, work in clean and safe environment, any pressure needed to be relieved
Precautions for working on pneumatics
High pressure air can be fatal wear ppe like glasses and rubber gloves
Precautions when working on a hydraulic circuit
Clean and controlled environment, with ppe, check for leaks check for wear and cavitation and discolouration
Given fault on a pc pump
(Pressure compensating)
The load sensing valve is not operating correctly as a result of it not pressure compensating, due to faults ls valve or compensating valve
Identifying a worn wheel bearing, what action should be taken
Possibly noise, excessive play off the floor, notify customer and quote repair and inform service manager
Action to be taken before commencing work
Carry out risk assessment, consider surroundings and ensure least risk as possible
Effects of opening a hydraulic system, also effects of low oil.
Containments may enter when cap open, or opening pipes for example. Containments can cause damage to components with fine tolerances.
Low oil can cause damage and cavitation
Cause of metal turning blue
Frictions plates worn or burnt out caused by heat damage
Faults within a transmission electrical system and components
Speed sensors, pressure sensor, temp sensors, controllers
Any component could have fault, high resistance/ error code
Oil is vital component
Fault for low oil in an engine
Components can create excessive heat, galleries will become blocked due to material breaking etc shell bearings breaking up
Target fuel pressure vs actual fuel pressure and consequences of a larger difference
Target is the aimed pressure calculated by the ecu, the actual is what is measured by the rail pressure sensor.
If there is a large difference it may indicate a fault sensor or relief valve stuck open or blocked filter. Or leak
Can cause running issues
Why could a con rod be bent
Hydrolock from excess fuel leaking from injector seal.
Debris from air intake/ water in intake
Incorrect valve timing
Incorrect ignition timing
Overloaded engine
Good practice to confirm fault
Tech should ask customer for info, replicate condition, allowing more efficient fault finding
Explain operation of 2 stoke oil
Total loss lubrication system. Also explains the non need for additives in a 2 stoke
Good practice for fitting filters
Put correct lube on seal, tighten to correct specification
What is the maximum voltage drop
0.25 volts,
How to test starting voltage
Volt drop pos, volt drop neg, current draw when starting
How to test can circuit
60 ohms down each wire
120 ohms at terminator
2 together are 5 volts
What should you take to tractor which isn’t starting
Battery and starter motor, multimeter, amp clamp battery tester
What would a 3 volt drop mean over a cable
The cable has a poor connection/ some additional resistance in the cable
Good practice for testing hydraulic systems
Check manual and service advisor for specifics, and ppe
How to check a hydraulic pump
Use a flow meter/ gauges depending on what pump your testing, specifics will be listed on service advisor.
Service advisor will show what temp to carry out test
Aiming for over 60 percent efficient
How would you hand over a machine
Clean with correct documents, customer has signed as proof of competence and you have shown then how to use it if they ask
How to diagnose faulty torque converter
What would you check on safety equipment
Safe working load
What do you need to work at height
Harness
How to dispose of coshh items
Can only be disposed using a contractor
What should you do if your under a machine
Remove key and leave a note
Loler inspection of axel stands
12 months
Loler equipment of a human lifting device
6 months
How to remove coolant cap
Slowly and ensure engine is cool
How is a grinder speed rated
M/s and rpm
Where to store grinder discs
Secure dry location
What direction does a reamer turn
Clockwise
How does a electronic compression test work
It uses the starter motor volt drop across different cylinder to calculate if one has lower resistance then others
How long to wait to report an accident
7 days
What are nitrile gloves used for
To protect from dermatitis
First thing to do to a machine
Carry out risk assessment
What is a current check
POS to neg
What is the max drop for volt drop
0.25
7 steps to diagnostics
Know the system.
Ask the operator.
Inspect the machine.
Operate the machine.
List probable causes.
Reach a conclusion.
Test your conclusion
Emulsified
Milky oil
How to tell if a coolant system has failed
Poor starting, white smoke overheating
What is an inductive sensor
Ac sine wave as speed increases wave increases
Satellite knowledge
Longitude, latitude , time and wheel angle sensor , steering wheel angle sensor
