John Deere 1025R Problems: Basic Troubleshooting Guide

The John Deere 1025R is a popular choice among small-scale farmers looking for a reliable utility tractor. Like most utility vehicles from John Deere, the 1025R is relatively easy to maintain and doesn’t put off major problems. Yet, there are instances when your tractor might require troubleshooting. Fixing 1025R’s issues starts with identifying the problem.

The most common John Deere 1025R problems include transmission and hydraulic failures that could lead to poor performance and sluggish operation. Brakes and steering problems usually happen due to poor maintenance. Electrical system problems are rare and generally linked to a defective battery. 

Here a quick over of typical issues and possible fixes with the JD 1025R model:

ProblemPossible Cause(s)
Engine not startingFaulty fuel injectors
Engine stallingLow coolant temperature
Engine overheatingDirty radiator fins
Engine knockingDirty or faulty fuel injectors
High fuel consumptionStale or wrong fuel
Gray or black smoke from the exhaustClogged fuel injectors
White smoke from the exhaustCoolant leaking into the engine
Low oil pressureLow oil level
High oil consumptionOil leak
Poor hydraulic performanceAir inside the system
Slow operationIncorrect oil type
Battery not chargingDefective battery
Starter not workingDefective starter or loose wires
Starter turning slowlyBattery not charged

John Deere 1025R Engine Problems

Engine Not Starting

The first thing to do if the engine doesn’t start is to check the transmission gear. Make sure the lever is in the neutral position – this operating error is more frequent than you think. If the lever is in the neutral position, the most likely culprits are the fuel injectors or the fuse.

Dirty or faulty fuel injectors must be cleaned or replaced; however, you should only clean or replace them yourself if you’re a trained mechanic. Otherwise, have the tractor serviced professionally.

If you suspect a blown fuse, you can check and replace it yourself.

Another potential problem could be a cold start, which could happen if you’re trying to start the tractor on a colder day.

How to replace a blown fuse

  1. Park the tractor, turn the ignition off, remove the key, and engage the parking brake.
  2. Open the hood and locate the fuse panel. A diagram on the side of the hood shows the location of each fuse.
  3. Locate the power outlet fuse. Pull it out of the panel and inspect it. If it is blown or damaged, replace it with a new fuse.

Engine Stalling

Engine stalling happens when your tractor’s engine suddenly stops operating as you’re riding in your tractor. Fuel starvation is one of the most common causes. If the fuel tank is full, you should check the fuel pump and make sure it works properly.

Low coolant temperature is another possible cause. Replacing a fuel pump or coolant requires servicing. Another potential culprit is a dirty fuel filter.

How to replace the fuel filter

  1. Park your vehicle on an even surface and allow the engine to cool. You should replace the filter when the fuel level in the tank is low.
  2. Raise the hood and remove the side panel.
  3. Place a drain pan under the tractor. With a pair of pliers, turn the fuel shut-off valve to the closed position, then remove the old fuel filter.
  4. Place the new filter in the old one’s position, reattach the fuel filter bowl and tighten the collar.
  5. Turn the fuel shut-off valve to the open position. You can now replace the side panel and close the tractor hood.


Engine overheating usually happens because of dirt accumulation on the hood screen or radiator fins or because the coolant level is low. You can fix both issues easily by cleaning the radiator fins and hood screen and by replenishing the coolant.

If cleaning the dirt and adding more coolant doesn’t solve the issue, the problem could be a coolant leak, broken fuel pump, or low coolant temperature. All these problems require professional servicing.

Engine Knocking

In general, engine knocking occurs when the peak combustion process doesn’t happen at the optimum moment. A clogged air intake valve could be one of the reasons this happens, and a quick fix is to clean the valve.

However, more often than not, an engine knocking on a John Deere 1025R signals a more serious problem.

The first thing to check is the fuel injectors. Clean them if dirty and adjust them if necessary. If the fuel injectors are broken, the tractor needs servicing. Other possible causes include a low coolant temperature or a faulty fuel pump – both of which require a mechanic’s assistance.

High Fuel Consumption

High fuel consumption can happen for a variety of reasons, some of which are benign. One of the most common is operating the tractor at too fast ground speed for the conditions. Thus, the first thing to do if you notice that your JD 1025R consumes more fuel is to slow down and make sure the speed matches the type of terrain you’re working on.

Stale fuel or improper fuel are other causes that are easy to fix. If you’ve hibernated the tractor without draining the fuel in the tank, you may notice a higher fuel consumption when you first start it at the beginning of the season.

Drain the stale fuel and replace it with fresh diesel. Sometimes, the tractor could run on improper fuel, but the consumption goes up. Drain the fuel and replace it with the right fuel type.

A plugged air intake system could also increase fuel consumption; all you have to do is to replace the air filter.

An improper valve clearance, faulty injectors, pump, or fuel solenoid are other possible causes. Adjusting the valve clearance and repairing faulty parts require professional assistance.

Exhaust Emitting Gray Or Black Smoke

Smoke coming out of the exhaust is always a cause for concern. If its color is black or gray, the most likely problem is insufficient fuel reaching the engine due to clogged injectors. Stale or improper fuel can also cause black or gray smoke.

To troubleshoot the problem, start by draining the fuel and filling the tank with fresh diesel. If the problem persists, you must clean the fuel injectors or replace them.

Exhaust Emitting White Smoke

White smoke is another problem that can be caused by stale or improper fuel. However, the most probable cause is coolant leaking out of the system. A lack of coolant can produce greater engine damage, so you have to deal with this issue promptly.

Low Oil Pressure

Low oil pressure is one of the problems that are easy to fix, but that can lead to severe engine damage if not dealt with promptly. When the oil pressure is low, the liquid will no longer flow freely around the engine parts. The various metal components will come into contact, and the resulting friction can cause breakages.

The most common cause for low oil pressure is insufficient oil in the tank. Add more oil to fix the problem. A plugged oil filter can also restrict the flow. An oil filter that needs cleaning must be replaced.

How to replace the oil filter 

  1. Bring the tractor to an even surface. Let the engine run for a few minutes to heat the oil.
  2. Place a drain pan under the tractor. Raise the hood and remove the side panel, then drain the oil in the pan.
  3. Remove the oil filter by gripping it with a pair of pliers and turning left.
  4. Take the new oil filter and smear it with some clean oil. Install the new oil filter by screwing it in place.
  5. Wipe away any loose dirt around the filter. Fill the oil tank with new oil up to the proper oil capacity. You can now close the oil tank, reinstall the side panel and close the hood.

Engine Consuming Too Much Oil

There are two main reasons why your JD tractor may be consuming too much oil: using improper oil or oil leaks.

According to John Deere 1025R’s user manual, you should use Plus-50 II or Torq-Gard Supreme oil. If you don’t have John Deere oil, you can use any type of DH-1 or DH-2 oil (JASO specification). If you are not sure about the type of oil in your tractor, drain it and replace it with one of the oil types above.

Oil system leaks can happen anywhere in the system and require you to have the tractor serviced by a trained mechanic.

Hydraulic Problems On The 1025R

Poor Hydraulic Performance

In hydraulic systems, the vehicle’s performance is closely linked to the pressure of the hydraulic fluid. If this pressure is altered, the tractor’s performance drops.

A loss of pressure is normal in all hydraulic systems and is generally caused by fluid consumption. However, the pressure can also rise if the pressure relief valve is faulty.

You can fix a low hydraulic pressure by replacing the hydraulic oil. If the pressure is too high, check the pressure relief valve and repair it if faulty.

Slow Operation

Sluggish operation is another problem linked to a faulty hydraulic system, usually caused by trapped water. Water in the hydraulic system alters the hydraulic fluid’s density and pressure, but there is an easy way to deal with it. Simply drain the hydraulic oil and replace it. If the problem arises again, call in a mechanic.

JD 1025R Troubleshooting Electrical System

Battery Not Charging

Battery problems can happen in all vehicles and are generally a cinch to deal with. The most likely cause is a defective battery that must be replaced. Other potential problems include loose or corroded connections or a faulty alternator.

How to check the battery

You can check the battery with a multimeter.

  1. Access the battery under the hood, at the right-hand side near the back.
  2. Disconnect the cables by removing the clamps holding them in place.
  3. Set the multimeter to voltage (or use a voltmeter instead).
  4. Touch the positive battery terminal with the multimeter’s red probe and the negative terminal with the black probe.
  5. If the reading is 12.6 volts, the battery works as it should, and the problem could be the connections or alternator. If the reading is below 12 volts, you have to replace the battery.

Starter Not Working

If the battery works properly, but the starter is not working, the most likely problem is a defective starter motor that needs replacement. Corroded battery connections are another potential culprit.

How to clean battery connectors 

  1. Access the battery as explained above, disconnect it and pull it out of its slot.
  2. Prepare a cleaning paste by mixing baking soda with a small quantity of water.
  3. Apply the cleaning paste to the corroded terminals and scrub with a toothbrush. Clean the wire connectors in the same way.
  4. Wipe off excess paste with a paper towel or a clean rag.
  5. Let the terminals and connectors dry properly before reinstalling the battery.

Starter Turning Slowly

A starter turning slowly is another problem linked to the battery. In addition to loose or corroded connections, this issue could be the result of a defective battery. Check the battery as explained above and replace it if needed.


The John Deere 1025R is a quality utility tractor that can provide long years of use. Like all vehicles, though, it can sometimes have problems. We hope this guide can help you with troubleshooting and resolving issues on the JD 1025R without too much hassle.