John Deere x739 is a great lawn tractor however, like other tractors it is not free of problems.
So, we have researched through all online forums, customer reviews, watched videos and compiled a list of common John Deere X739 problems.
Read on to learn what these problems are and how you can fix them.
John Deere X739 Problems
1. Belt Keep Slipping
This is one of the most common problems in John Deere X739. In this problem, the mower belt keeps slipping.
These are some reasons why your X739 mower belt slips.
One of the most common reasons is that the sheave, or pulley, on which the belt runs is dirty. Another common reason is a worn belt.
If there is no tension on the belt, it can also cause slipping.
All of these problems can be fixed by following the proper troubleshooting steps.
The first step in troubleshooting the John Deere X739 mower belt slipping is to check the sheave or pulley; if this is dirty, clean it.
To clean the sheave, remove it from the mower and scrub it with a brush. Be sure to clean any other pulleys the belt runs on, as they can also be dirty.
Once the sheave is clean, replace it on the mower and see if the problem persists. If it does, move on to the next step.
The next step is to inspect the belt for wear. If the belt is worn, it will need to be replaced. To replace the belt, remove it from the mower and install a new one.
The final step is to check and adjust the tension on the belt. The belt should be tight enough that there is no slack but not so tight that it causes undue strain on the motor.
2. Leaving Uncut Grass
This is another common problem in John Deere X739, which many owners complain about.
If your John Deere X739 mower is leaving uncut grass, the first thing you should check is the cutting deck. If it is clogged, you’ll need to clean it out. Another possibility is that the blade is damaged and needs to be replaced.
Also, a possibility is that the mower deck is too low from the ground; if that’s the case, you’ll need to level it.
In the end, you should check the mower’s bagger; if it is too full, it can also cause uncut grass. In this case, you’ll need to empty it.
If none of these things seems to be the issue, you may be just going too fast; therefore, try using a mower at a slower speed.
3. Mower Vibrating Excessively
If your John Deere X739 mower vibrates, it could be due to several issues.
One possibility is that there is debris on the mower deck or in the sheaves. This can cause the blades to become unbalanced and create a vibration.
Another possibility is that the mower belt or pulleys are damaged. If this is the case, you will need to replace the damaged parts.
Also, if the belt or pulleys are not adjustable, you will need to inspect them and make any necessary adjustments.
In the end, if the blades are not balanced correctly, this can also cause a vibration. You can also fix this issue by balancing the blades.
4. Cutting Unevenly
If your John Deere X739 mower is cutting your grass unevenly, it could be due to insufficient tire pressure or the wrong rollers and the mower deck position is not levelled.
You can also check to see if the blade is bent or worn, as this can also cause uneven cuts. Luckily, all of these issues are relatively easy to fix.
Level the mower deck, adjust the tire pressure and move the rollers to the correct position.
If necessary, sharpen or replace the blade.
5. Tractor Engine Not Starting
If your John Deere X739 engine is not starting, the most common reason is that there is no fuel in the fuel tank.
Make sure to fill it with fresh gasoline before starting the engine again.
Another possibility is that you are using the wrong grade of gasoline.
Be sure to use quality gasoline in your John Deere X739 engine to avoid this issue. If you are using old gas, this could also be causing your engine not to start.
Drain the gasoline and fill it with fresh gas to see if it solves the problem.
Another possible reason why the engine is not starting could be because the fuel system is clogged. A professional mechanic can repair this.
You should also check the spark plug wire if the spark plug wire is faulty; this can also prevent the engine from starting. So, if that’s the case, you will need to replace the wire.
Dirty fuel filters are also responsible for the problem. This will need to be replaced with a new fuel filter. Finally, if the brake pedal is not depressed, this can also prevent the engine from starting.
Press the brake pedal down firmly to see if this solves the problem. If none of these solutions works, then it is likely that the carburetor needs to be adjusted.
A professional mechanic will be able to do this for you.
6. Engine Running Rough
When the engine of a John Deere X739 lawn tractor is running rough, it is usually due to one of four issues: cooling fins that are blocked, damaged electrical contacts, an incorrect ignition adjustment, or a choke cable that sticks.
To fix the problem, clean or wash the cooling fins, check and restore any damaged connections, inspect the spark plug and ignition system, repair or replace the choke cable, or clean or change the air filter element.
If the problem persists, it is advisable to take the lawn tractor to a qualified John Deere dealer or service centre for further diagnosis and assistance.
7. Engine Overheats
Engine overheating is one of the most common problems experienced by John Deere X739 owners.
There are many reasons why an engine may overheat, but the most common cause is excessive load. Reducing the loads on the engine will help to prevent overheating.
Another common cause of engine overheating is a blockage in the air inlet or cooling fins. This can be caused by debris build-up, which can be removed by cleaning the affected components.
If the engine oil level is low or too high, this can also lead to overheating. The oil level should be checked and adjusted as needed. Also, low-quality engine oil can cause overheating, so it is essential to use high-quality oil.
Finally, if the crankshaft to main bearing clearance is too large, this can also cause overheating. The clearance should be checked and adjusted as needed.
If the engine is overheating due to too fast of an idle speed, the idle speed can be adjusted as needed.
8. Engine Backfires
There are many reasons why your John Deere X739 engine might backfire, but one of the most common is a problem with the spark plugs.
If the plugs are old or worn out, they may not be firing correctly, and this can cause the engine to misfire.
Another possibility is that the choke is not adjusted correctly. This can allow too much air into the engine, causing it to backfire.
Another common cause of engine backfires is a problem with the carburettor. If the carburetor is not adjusted correctly, it can cause the engine to run too lean or too rich.
This can lead to backfires as well. Additionally, if there is an ignition coil problem, this can also cause backfires.
Other potential causes of backfires include sticking valves, incorrect valve clearance, and a problem with the flywheel key.
If you are having trouble diagnosing the cause of your engine backfiring, it is best to take it to a qualified John Deere dealer or service centre for diagnosis and repair.
9. Engine Losing Power
If your John Deere X739 engine is losing power, there are a few potential causes. One possibility is that the oil level is too high.
Remove any excess oil and see if the problem persists.
Another possibility is a defective fuel pump. Inspect and repair the fuel pump as needed. Additionally, a defective governor can cause power loss.
Checking and adjusting the governor may fix the issue. Finally, check the carburetor float adjustment. If it is off, it can cause power loss.
Test engine compression, to be sure.
10. Hard Steering
One common issue owners of the John Deere X739 have reported is stiff steering, particularly when turning at low speeds.
The most likely culprit for this problem is air in the hydraulic steering system. When there is air in the system, it causes the steering to feel “spongy” and makes it hard to turn.
You can fix this problem by bleeding the air out of the system.
Another potential cause of hard steering is a clogged steering filter. If the filter is blocked, it can restrict fluid flow to the steering system and make it harder to turn.
To solve this, you should clean the steering filter or replace it if you think it is necessary.
Another possibility is that there is not enough steering oil in the system. The oil level should be checked and topped off as needed.
If the problem persists, it may be due to a defective or worn hydrostatic steering unit. This will need to be inspected and replaced as necessary.
Also a faulty steering pump can also cause hard steering. The pump may need to be replaced or repaired. Additionally, the steering pump control valve may be stuck or faulty. Servicing or replacing the flow control valve should fix the problem.
In some cases, stiff steering may also be caused by incorrect tire pressure or toe-in. The tires should be inflated to the correct pressure, and the toe-in should be checked and adjusted as needed.
If there is a leakage in the steering cylinder, it can also cause hard steering. In this case, the piston seals will need to be replaced, or the piston rod may be damaged.
11. Tractor Pulling to Left or Right
One of the most common problems with John Deere X739 is that sometimes it pulls to the left and sometimes to the right.
This can be extremely frustrating, especially when trying to plough a straight line.
To fix this problem, the first thing you should check is your hydrostatic steering unit. If this unit is damaged or worn, it can cause your tractor to pull to one side.
You’ll need to either repair or replace the steering unit to fix the problem.
Another possibility is a faulty steering cylinder. If your tractor’s steering cylinder is damaged, it will need to be replaced.
You can also try adjusting the hydraulic pressure to see if that makes a difference.
If your tractor is still pulling to one side, the problem is likely with the front wheel bearings.
These bearings can become worn over time, causing your tractor to pull to one side. You’ll need to replace the bearings or adjust them properly to fix the problem.
Also, uneven tire pressure can cause your tractor to pull to one side. Make sure that all of your tires are inflated to the correct pressure and that they’re all the same size.
This will help ensure that your tractor travels in a straight line.
Conclusion
No doubt John Deere X739 is a great tractor; however, it has some problems you should be aware of before buying it.
We have outlined the most common problems of John Deere X739 that most people face. Follow are the common problems with John Deere X739:
- Belt keeps slipping.
- Leaving uncut grass.
- Mower vibrates excessively.
- Cutting unevenly.
- Tractor Engine not starting.
- Tractor Engine running rough.
- Tractor Engine overheats.
- Tractor Engine backfires.
- Tractor Engine loses power.
- Hard steering.
- Tractor pulling to left or right.
I’m David man behind Lawn Mowerly; I’ve been dealing with lawnmowers and Tractors with my father since I was a kid. I know every make and model and what each one is capable of and love helping people find the perfect lawn mower for their needs.