John Deere manufactures one of the best tractors around the globe. The people love the quality of their tractors.
It is because they simultaneously provide the users with the best comfort and performance. The John Deere 9670 STS is also one of their best-selling tractors, as most users reported.
However, some of the users faced issues with this unit. So, this article will help you troubleshoot all the John Deere 9670 STS problems.
How to Fix John Deere 9670 STS Problems
1. Oil-Leaking Problem
Most of John Deere’s 9670 STS users found oil leaking problems soon after buying it. This problem is caused if the use of the wrong type of oil.
This problem can be fixed by replacing the engine’s seals with new ones from the nearest customer service center.
However, replacing the seals will cost a lot. Hence, to save money, you must claim the tractor’s warranty, and the company will provide you with their service for free.
2. Water Pump Problem
The John Deere 9670 STS users also ran into problems with the water pump. The users experienced that the water pump starts leaking after some time. Therefore, this problem needs to be fixed as soon as possible.
If the leakage worsens, the water can mix with the engine oil, which will cost you a lot to improve. Thus, this problem can be fixed easily by repairing or replacing the water pump from the nearest customer service center.
3. Low-Voltage Problem
The voltage problem is also one of the most common problems that the users of John Deere 9670 reported. This problem is very frustrating for daily drivers.
Therefore, the reason contributing to this problem must be addressed as soon as possible.
However, this problem can be easily fixed by inspecting the battery and the main power cable connected to the battery.
You should start the inspection from the battery health, and if the battery health is weak, replace the battery from the nearest auto zone.
On the other hand, if the battery is not the case and you are still stuck in this problem, then to fix this problem, all you need to do is to check the main power cable of the tractor.
It is because if the main power cable is defective, then this problem can show up. Therefore, replace the main power cable to fix this problem.
4. Faulty Crankshaft Position Sensor
The crankshaft position sensor is placed on the side of the engine block near the crankshaft pulley. It relays information about the crankshaft’s position to the engine control module (ECM).
If this sensor is not working correctly, it can cause the engine to misfire or run rough.
Most John Deere 9670 STS problems results from a faulty crankshaft position sensor. This is a common problem on these engines, and it is usually first noticed when the engine starts to run rough or misfire.
If you suspect that your John Deere 9670 STS has a bad crankshaft position sensor, you can check the engine code. If the code reads “P0335,” the sensor is not working correctly.
5. Faulty Fuel Injector
Another common problem with the John Deere 9670 STS is a faulty fuel injector. This can lead the engine to run rough or misfire.
If you suspect that your John Deere 9670 STS has a bad fuel injector, you can check the engine code. If the code reads “P0302,” the injector is not working correctly.
To fix this, you will need to replace the faulty injector.
6. Engine-Starting Problem
Many John Deere 9670 STS consumers also face the engine starting problem. The users experienced this problem soon after buying it.
This problem can be fixed by checking the tractor’s wiring, battery, and fuel lines.
You need to start the inspection from the battery of the tractor and if the battery health is weak, then replace it as soon as possible.
On the other hand, if the battery is not the case, then inspect the wiring. After checking the wiring.
if you find any problem with the wiring, then replace it from the service center. Moreover, you can also run into this problem if the fuel lines of the tractor are blocked.
Therefore, clean the fuel lines and the filter as well. By doing this, the problem will be fixed.
7. Fuel-Consumption Problem
Aside from the engine starting problem, you can also run into the fuel consumption problem, as reported by many consumers of this unit.
The users mentioned that the tractor starts draining a lot of petrol after some time. Therefore, this problem should be fixed as soon as possible.
You can fix this problem quickly by inspecting the fuel filter, fuel lines, air filter, oil type, fuel type, and the plugs of the tractor. First, start the fuel filter inspection; if it is clogged, replace it with the nearest authorized dealership.
On the other hand, if you are still stuck in this problem and the tractors’ fuel consumption did not improve, then all you need to do is to inspect the fuel lines.
If the fuel lines leak or block, the tractors’ fuel consumption can be disturbed. However, if this is the case, clean the fuel lines, and the problem will be fixed.
Moreover, you can also face this problem if the air filter or the plugs are dirty. For this reason, all you need to do is to replace them.
Furthermore, using the wrong oil and fuel type can also cause this problem. Thus, using the correct type will fix this problem.
8. Faulty Ignition Coil
The ignition coil is located under the cowling on the side of the engine. It provides the spark that ignites the fuel in the cylinders. If this coil is not working correctly, it can cause the engine to misfire or run rough.
To identify if this is the problem, check the spark plugs. If they are black and sooty, the ignition coil is likely not providing enough sparks.
9. Loose or Damaged Spark Plug Wires
The spark plug wires connect to the ignition coil. If these wires are loose or damaged, it can cause the engine to misfire. To check if this is the problem, inspect the spark plug wires for any damage or looseness.
Spark plugs are located in the cylinders and provide the spark that ignites the fuel. Over time, they can become damaged or worn, which can cause the engine to misfire. Inspect the spark plugs and replace them if necessary.
10. Dirty Fuel Injectors
The fuel injectors usually spray fuel into the cylinders. If they are dirty or clogged, it can cause the engine to run rough.
To clean the fuel injectors, remove them, soak them in a water solution, and clean them overnight.
11. Fuel Pump Issues
The fuel pump delivers fuel from the tank to the engine. If it is not working correctly, the engine will not run. First, check the fuel filter to check if the fuel pump is the problem.
If it is clogged, it could be preventing fuel from reaching the engine. Check the fuel pump itself if the filter is not the problem.
12. Faulty Mass Air Flow Sensor
The mass air flow sensor is located on the air intake duct after the air filter.
It works to record the amount of air flowing into the engine so that the fuel injection system can deliver the correct fuel. If this sensor is not working correctly, it can cause the engine to run rough.
To test if this is the problem, remove the mass air flow sensor and clean it with a cloth. If this does not solve the problem, consider replacing the sensor.
13. Oxygen Sensor Issues
The oxygen sensor is in the exhaust system and measures the amount of oxygen in the exhaust gas. The engine computer uses this information to adjust the fuel mixture.
If the oxygen sensor is not working correctly, it can cause the engine to run rich or lean. To test if this is the problem, remove the oxygen sensor and clean it with a cloth. If this does not solve the problem, then replace the sensor.
14. Bad Catalytic Converter
The catalytic converter is located in the exhaust system and helps to reduce emissions. If it is damaged or not working correctly, it can cause the engine to run rough.
To test if this is the problem, remove the catalytic converter and inspect it for damage. If it is damaged, then replace it.
These are some potential causes of engine problems for a John Deere 9670 STS. If you still have trouble after trying these solutions, bring your tractor to a qualified service technician for further diagnosis and repair.