John Deere 4120 is a heavyset public utility tractor from their 4000 Twenty Compact Series . It practice a John Deere 2.4L 4 - cylinder diesel railway locomotive . It is a true machine with loaders too , for daily usage .
However , the most common trouble with this one are the cold starting issues , ignition issues , hydrostatic problems , smoking from the exhaust fumes , failure under load and sensor issues .
In this article , I have done mass of inquiry and accumulated info about all these job . You will also find full proof fixes here regarding these issues .
Problems and Solutions at a Glance :
5 Most Common Problems with John Deere 4120 and Their Possible Solutions:
Many mutual John Deere 4120 job are deal with by the possessor . Here are some of the problems and how to solve them .
1. Cold Start Issues
The JD 4120 has problem start when the temperature drops below 30 degrees Fahrenheit . You may have changed the filters , added algicide and additives for anti - gelling , and did necessary troubleshooting .
But even change the battery and servicing the luminescence plugs often will not work out the takings . If it does set about , it make a lot of white smoke and stumble around before finally settling down and course smoothly .
unluckily , this is how the 4 - piston chamber JD behaves in the wintertime . Other issues can be the PTO yield , bottom rubber switch etc . In which casing they will need to be supervene upon .
Install an intake warmer rather of a glow plug for the winter problem . Turn the keystone in for 15 seconds to warm the air . to boot , change by reversal on the tractor while hold the key in place and keep holding it until the engine idles smoothly .
Before it idle smoothly , there is a stuttering menstruation of roughly 10 to 15 seconds . Additionally , if you ’ll somewhat increase the accelerator like a shot before starting , the tractor will go smooth faster .
2. Hydrostatic Problems
The hydrostatic problems manifest as a tiny “ tug ” . The “ jolt ” happen more frequently as the tractor becomes hotter . It feels like a abbreviated lock and dismissal of the wheels . You may line up lousy engine vegetable oil .
However , interchange the filter and oils , and clean the suction filter with the tractor ’s gearbox and hydraulic oil out may not figure out the matter .
You will experience it in both the 2 - wheel drive and 4 - bicycle drives . It befall whether or not the PTO is activated . And whether or not the loader is being utilized ( or installed ) .
You may also get a Throttle Sensor Error 08 code . Additionally , you may get an out - of - range or uncalibrated potential difference sign , want of an anti - stall feature , or performance release etc .
The military issue may be brakes and pasture brake sensors . Or a solenoid heating up . The issue in short stops the hydraulic flow that drive the wheels .
turn off the Loadmatch to see if it solves your issuing . Next , check the LVA14167 inline oil filter from the oil cooler . Inspect the concealment for harm .
Check the suck line to the two hydraulic pump . If there is any evidence of oil at the rubber tube near the pumps or at the filter end , you might be sucking aura into the hydrostatic charge pump .
supersede the caoutchouc tube ’s clinch with untarnished worm / screw clamps . Then see to it to see that the multiplex connect the two pump is firmly fasten to each ticker . call for the dealer to chequer the MFWD sensor if nothing else work .
Your front axle may also be the issue . at long last , control for confused power train . The detector for the hind end and foot pedal may also be the emergence .
3. Fuel Injector Issues
You may point out fleshy exhaust system fastball coming out . There may be a lack of fire on all cylinders . A malfunctioning fuel injector and some form of news leak may be the subject .
replace the fuel injector is the fix to this job . The fuel injectors can get damaged due to unsound fuel getting past the filter .
4. Failure Under Load
On a 4120 , when you turn the lading switch to “ on , ” the drive wo n’t move the tractor unless the tractor is running at 1500 + revolutions per minute . It happens due to consignment match .
The error computer code 01 may dash on the dashboard . The tractor will refuse to move forward or backward . This may be a problem with the potentiometer for the forward foot pedal .
It could be broken or need to be reset . Additionally , if you ’ve been drive through bushes , something might have enamor on a wire under the tractor and take out it free . Wires are n’t always tied down and tucked off properly .
There ’s piddling you’re able to do about the loadmatch . It ’s just by blueprint of this tractor . Troubleshoot the PTO hold , front and back pedals , solenoid , atomic number 8 - rings , wires etc . Replace if necessary .
Load match is a good governor that is controlled by the CPU and a estimable anti - theft feature . Its caper is to keep the revolutions per minute from stopping . Do n’t use it in any other gear than A or B , and only at high RPMS ( 2000 or up ) .
5. Sensor Problems
A openhanded sign of sorry sensors is that the tractor is hard to start when it ’s cold . The locomotive engine will pop out and then break . It will start up again , but you will have to crank it a lot .
to boot , when driving with or without loadmatch on , the engine rev up and down by about 300 rev . This may be due to the MFWD hurrying sensor .
The job can be either with the fuel shut - off solenoid or with the wires that go to it . The tractor will just block suddenly without a change of RPMSs .
Before it will move again , you may have to take your whole foot off the pedal point . This seems to find with or without a load .
There are error code for the forward and countermand pedal detector being above or below normal or out of range / out of standardisation . It indicate a foot lever was short to ground or eminent .
The instrument accountant ( also call the dashboard or ICC ) can find wrongdoing . let in the transmission system control unit ( TCU ) as well . All of them have screens on the fascia .
If the seat sensor was break , the tractor would blockade and not move until the hydro pedal was eject all the way . Most likely , there would n’t be an error computer code .
Conduct tests to find each specific sensing element . Replace when damage .
What Majority of the Users Feel?
The John Deere 4120 is a reliable car . This framework does n’t have any sort of emission controls though . It get the best use from early leap to early winter by the user .
Everyone finds it simple and well-fixed to expend . The 4120 is better for snow in narrow-minded position , but only for weak snow . It does great with a 400X dockhand with 73 - in dense - duty bucket with cut boundary .
Overall , this is a tractor that everyone ’s slaked with .
Frequently Asked Questions
What is a effective back hoe to use with the JD 4120 ?
485 Backhoe with 18″ bucketful .
Which JD apply is best on a 4120 for implement ?
JD skid steer attachment attack aircraft carrier .
How many HP is a John Deere 4120 ?
43.1 HP .
Final Thoughts
After research , I can say that the JD 4120 is a satisfactory tractor overall . It does add up with some problem but these are not extremely specific . Generalized problems materialise with any tractor . And this one seems to be worth the bargain !
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