6 Common John Deere 3039r Problems + Troubleshooting

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John Deere 3039r problems are no different from the problems of other JD tractors. The JD series come with similar problems and might all require different troubleshooting processes.

You might encounter different problems with the John Deere 3039r tractors, such as engine problems, transmission problems, fuel consumption, emission of black smoke and others that we will discuss in this article.

I will also show you the different John Deere 3039r troubleshooting means for each problem and the permanent solutions.

Let’s get started!

Top 6 Problems with John Deere 3039r and Solutions

Some customers have come out with some prevalent John Deere 3039r problems worth discussing. I’ve listed 6 fundamental ones. 

Let’s discuss this further-

1. Loose Blades

Photo by Lee Cannon via Flickr

If the mower blades of your JD mower are too relaxed to function, you can’t fashion the entire lawn with uniformity. To chop off your mower grass, a sharp mower blade with proper settings is compulsory. 

The experts have noted many explanations for why your mower blade can be loose. 

It can be due to the damaged bypass lock or if they’re unlocked accidentally. As an amateur, these issues may appear very sensitive. But the solutions down below will make things simpler for you- 

Park your John Deere 3039r on the straight ground and release the battery connection to prevent accidental activation. 

Customize the cutting length of your mower to 3″. If you want to function under the deck of the mower, this particular height is adequate enough. 

Ensure that you fix the blades in such a way that it faces you. According to the professionals, the length between the mower’s deck and the ground has to be 3″. If not, then you have to fix the settings.

Fixing the screw and bolt levels is also essential.

See Also: John Deere 3033r Problems

2. Transmission Failure

If you inquire of me about the most significant problem with respect to the John Deere 3039r lawnmower, I’ll tell you it’s the Transmission failure. 

Transmission failure is associated with mechanical power changing into fluid power. 

The hydrostatic power of JD 3039r helps the mower to change fluid power into shaft power. Unlike essential lawnmowers, this piece can assist you with unexpected working hours.

Still, there is the likelihood of transmission failure with your JD 3039r if you’re not troubleshooting the problem. A good session of maintenance every month is crucial for avoiding transmission failure. 

3. Overheating Engine

There’s no question that your John Deere 3039 lawnmower functions hard in scorching heat to mow your lawn evenly. Hot summers in union with long working hours can result in engine overheating problems. 

There are some situations under which your lawnmower’s engine can get too hot. If your engine is repeatedly overheating, the elements of your engine can combust, widen or get weakened. 

The explanation behind the engine overheating problem is put down below:

Dirty Lawn Mower Engine: There’s no substitute for a clean engine to protect your mower’s condition. An untidy engine can obstruct the air intake, fuel filters and hoses. 

So, tidying up your mower engine utilizing a gentle brush is a must. Tidying up your engine utilizing a soft-bristled brush will enable the air to come inside. And by this, you can prevent your engine from heating.  

Low Oil Levels: Evening the oil levels of your mower can protect your mower from numerous upcoming difficulties. Low oil levels are equally deadly the way utilizing a bad-grade oil is.

Always examine the oil levels before turning on your mower engine. And never have your engine half-filled with leftover oil for months. Before replenishing the engine with oil, allow it to relax for a while.

Air Penetrating the Fuel Filter: If your engine oil is stirring up with the air from the outside, it’s a problem for the engine’s condition. Fuel in combustion with the air can overheat your engine and damage its elements of it. 

You are also required to examine if your mower’s fuel filter or cylinder hoses are okay or not. A dirty filter can cause harm to the fuel. So, giving it constant attention is necessary. 

Cooling Fins or Shrouds Becoming Weary: If your mower heats up repeatedly, it can dissipate heat and dislocate the actual position of your mower.

Preserving the perfect stance of these elements is a must for maintaining the coolness of your engine while it overheats. Else, the adversities can singe or dissolve the other components of your mower. 

4. Black Smoke

If your mower exudes excess black smoke, it is possibly taking too much fuel, much more than it has to. Yes. The mower professionals understand this problem to be “the mower running rich”. 

This difficulty impacts your mower’s operation and makes you waste plenty of money on purchasing fuel. This problem occurs when your mower’s carburetor gets overrun with fuel, or the fuel filter has any leakage. 

A regular repair session is the only way to protect your mower from emitting black smoke. You also have to confirm that you’re cleaning the mower engine and its carburetor on time.

5. Issues with the Electrical System

One of the most prevalent problems with the John Deere mowers is that they occasionally show electrical problems. The problem mainly pertains to the battery. 

Nonetheless, it’s nothing to be bothered about. 

This issue arises when your mower’s battery is ineffective in serving you with potential energy. Electrical turbulence may also happen because of ignition power problems. 

Changing your old battery with a different one will quickly get you rid of the complication. And if that doesn’t solve the problem, your engine has broken down. 

You can also carry it to a mechanic who can examine and tell you about the issue. It’s never a big deal to ask for professional help.  

6. Abnormal Fuel Consumption

Do you feel your mower is consuming more fuel than it usually does? 

There might be something improper with your John Deere’s carburetor. Accidental leakage or clogged carburetor is the reason behind such difficulty. 

A jammed carburetor is behind the fuel overflow from the carburetor bowl vents and wetting spark plugs. The Ethanol fuels utilized these days tend to draw moisture from the outside.

And the metal in touch with the air gets rotted easily. As an outcome, surprising damage happens inside the fuel tank and hoses. The condition can come under constraints if you utilize a fuel stabilizer for your carburetor. 

Aside from unwanted Ethanol deposits, you can also regulate unusual fuel deposits.

See Also: 12 Common Cub Cadet Intellipower Problems

Troubleshooting John Deere 3039r Problems

Firstly, let us talk about the critical features of maintaining the optimal performance of the John Deere 3039r tractors. John Deere 3039r is the first-class mower if you are capable of dealing with its slight problems.

Regular maintenance has no substitute for dealing with the difficulties a mower shows. Rubbing off the dirt and debris solves half of the issues with your John Deere 3039r tractor.

Now, let us check out those troubleshooting tips, shall we?

The engine can not crank

John Deere 3039r engine not cranking could be because:

  1. You used the wrong type of fuel.
  2. Inadequate high-pressure fuel pump – check and refit.
  3. Improper fuel injection pump timing – you’ll need to adjust it.

Engine deficient output 

  • Improper valve gap.
  • Inappropriate valve clearances. 
  • Slackened or damaged wiring – Inspect all wiring. 
  • Bleed air from the fuel system.

Diesel engine stalling

  • Air present in fuel supply system – Bleed air. 
  • Piston seizing. Inspect and change it.

Hard shifting transmission

  • Front bearing retainer relaxed or cracked – Tighten or change the retainer.

The steering wheel turns around without opposition

  • Minimal oil grade – You need to add some more oil. 
  • Possibly malfunctioning steering hydraulic cylinder – Repair. 
  • Pump steering broke – Change pump.

Motor not starting

  • Starter motor spins engine too slowly – Change or repair. 
  • Fuel pipes are corrupted – You should do some washing and cleaning. 
  • There is grime in the fuel filter – Put a new filter element. 
  • Piston rings are bad – they’ll require some repairs.

The steering wheel is hard to turn

  • Poor oil index. 
  • Steering pump malfunction. 
  • Steering pump damaged – Fix tie-rod. 
  • Hydraulic connection leaking – It is essential to rectify the defect. 
  • Power steering pump damage – Inspect the steering pump. 
  • The power steering is old – Needs repair.

The diesel engine starts hard

  • Air or water in the fuel system. 
  • The battery is out of power – Recharge or change the battery. 
  • The cold start system was utilized wrongly. 
  • Defect or wear of piston rings. 
  • Broken down injector Body or Cup. 
  • Water in fuel. 
  • Crankcase oil too massive – Utilize oil of proper thickness.

Diesel is challenging to start 

  • Restricted fuel lines. 
  • Air leaking on the suction side of the system. 
  • Constraint in the exhaust pipe. 
  • Sluggish starter speed. 
  • Diesel injection nozzles bias or sticking. 
  • Filter blocked. 
  • Inappropriate timing.

Steering not functioning on my tractor

  • Air is present in the hydraulic system – Must eliminate the air. 
  • Hydraulic oil low level in the tank – Fill up the oil. 
  • The steering cylinder has issues- Rectify it.

The engine doesn’t start

  • Valve timing is inappropriate – Adjust valve timing. 
  • Poor compression. 
  • Wear cylinder bores – You must repair them. 
  • Leakage between seats and valves – Repair the leakage.

The diesel engine knocks

  • There is a little remnant of engine oil – Put some more oil. 
  • There is a low temperature of the coolant.

The front axle is cracking

  • Faulty gear – Change gears. 
  • Roller bearings have defects – Change the replacement.

Diesel starting is very difficult

  • The injection nozzle is jammed – Assess the nozzle. 
  • The high-pressure fuel pump has a problem – Overhaul the high-pressure fuel pump.

Differential lock assembly breaks down

  • Diaphragm crack or wear of discs friction clutch – Replace old components.

The engine does not start

  • Most likely dirt in the fuel system. 
  • Injection pump to missed adjustments.

Engine frequently overheats

  • Absence of coolant in the cooling system – Fill the cooling system to the right level. 
  • Insufficient oil – Change the oil to the proper grade. 
  • Oil level is insufficient – Top up to level. 
  • Overloaded – Lessen the load. 
  • Going out of engine oil – Put some more engine oil. 
  • Crushed or misadjusted fan belt – Fix or replace.
  • Crunch in the rear axle housing
  • These sounds warn about the destruction of bearings.

Diesel excessive white smoke at idle

  • If the white smoke is evident from the exhaust pipe – Change the piston rings immediately. 
  • Air filter shut off – Tidy up or change as per maintenance schedule.

Frequently Asked Questions

How much horsepower does a John Deere 3039r have?

A John Deere 3039r has 38.2 horsepower.

How much can a John Deere 3039r lift?

A John Deere 3039r can lift 995 kg.

Is the John Deere 3039r a 4WD?

Yes, the John Deere 3039r is a 4WD.

How much does a John Deere 3039r weigh?

A John Deere 3039r weighs from 2900 to 3570 pounds.

Does a John Deere 3039r have PTO?

Yes, it does.

See Also: John Deere 2032r Problems


Every landscaper’s vision is to acquire a lawnmower that levels out every inch of their lawn grass. And John Deere 3039r is just about the right mower that satisfies the desires of every landscaper.

However, John Deere 3039r problems like loose blades, transmission failure, overheating engine, and the rest can make owning it a pain. But these problems will no longer come to be an impediment to your mowing once you know how to deal with them.