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
