7 Most Common Zetor Tractor Problems: Their Causes And Solutions!

Several troubles may arise in the Zetor tractor. And those will eventually impact the overall performance of the tractor. A lack of proper knowledge about these troubles may increase the difficulty in dealing with them. That’s why a clear concept of those issues is necessary.

So what are the most common Zetor tractor problems? Issues like difficulty in starting, insufficient engine output, overheating of the engine, and failure of the starter motor may arise. You may also encounter issues like uneven speed, slow brake response, and battery charging difficulty.

In this article, we will discuss the 7 most common problems with this tractor. We will also enlighten you about their causes and solutions throughout the article. Thus, to learn more, keep reading!

Table: Problems And Quick Solutions

Below are the problems and their solutions for a quick look before going into a deep discussion.

1The engine doesn’t startRepair or replace the faulty fuel pump, spark plug, and fuel filter. Make sure to bleed the system properly
2Overheating of engineCheck and maintain the sufficient water level in the radiator. Also, stretch the V belt of the water pump
3Uneven speed of the tractorClean the dirty delivery and injector valves. Besides, remove the air bubbles that are trapped in the fuel
4Failure of the starter motorRemove dirt from collectors, and repair the damaged carbon brush. 
5Difficulty in battery chargingReplace the dead battery and repair or replace the faulty alternator. Additionally, fix the voltage regulating relay properly
6Slow response of the brakeRefill the brake fluid bowl with a sufficient level of brake fluid. Repair the damaged brake line
7Poor engine output Clean the dirty nozzle. And tighten all the seals and gaskets of the cylinder to prevent oil leakage

7 Most Common Zetor Tractor Problems: How to Fix Them 

Now let’s have a clear concept of the causes of those problems in detail, along with the solutions. 

1. The Engine Doesn’t Start

Sometimes, the engine doesn’t start because it doesn’t get enough fuel to burn. As a result, the tractor doesn’t get sufficient energy to begin immediately. 

When there is a problem with the injection pump, it won’t be able to supply adequate fuel to the engine. Also, insufficient fuel system bleeding might be responsible for this problem. 

Sometimes, the fuel filter or spark plug becomes contaminated with dirt, which may result in contaminating the fuel also. Eventually, this might cause issues with the starting of the tractor.


  • Check and clean the dirty fuel filter and spark plug
  • Repair or replace the damaged injection pump, spark plug, and fuel filter
  • Bleed the fuel system sufficiently

2. Overheating Of Engine

Overheating mainly occurs when the heat produced in the engine is unable to escape from the engine compartment. Generally, engine heat fails to escape due to the cooling system’s failure.

When the water level is insufficient in the radiator or the radiator is clogged with scale, it fails to transfer the heat outside. Besides, a loose water pump V-belt may also cause an overheating issue.

Moreover, with use for a prolonged period, the oil quality keeps degrading daily. This deteriorated condition of the oil is also responsible for the engine overheating. However, a damaged radiator may also lead to this issue.


  • Check the water level frequently and refill the radiator with water when needed
  • Clean the radiator and remove all the scale formation
  • If the radiator is faulty or leaking, repair it
  • You need to stretch out the loose v-belt of the water pump 
  • Change the degraded oil

3. Uneven Speed Of Tractors

When the speed of a tractor becomes uneven, it will operate sluggishly or roughly. If air enters the fuel tube, it will lean the fuel condition. The high amount of air in the fuel results in varying speeds of the tractor.

Sometimes, clogged injection and delivery valves also cause less fuel supply. As a result, the engine doesn’t get sufficient fuel, and the tractor runs unevenly.


  • Inspect the injection valve properly and clean the dirt
  • You also need to clean the dirty delivery valve
  • You have to remove the air bubbles from the fuel. For this, you must crank the engine after loosening the injector’s cap nut

4. Failure Of The Starter Motor

If the starter motor fails, you will not get any response after the ignition switch is activated. And, the starter will not engage instead of the clacks. Generally, a defective electromagnetic coil is primarily responsible for this starter motor issue.

Moreover, the collectors could be clogged with dirt, and also the carbon brush can become faulty. Both cases will hinder the proper electric connection in the motor. Hence, it will be responsible for the starter motor to fail.


  • Clean the collectors properly
  • If the carbon brush becomes damaged, you must repair or replace that
  • Repair the defective electromagnetic coil with the help of a professional workshop 

5. Difficulty In Battery Charging

Sometimes, even if you set the battery to charge for an adequate time, the battery won’t charge properly. If the battery is damaged or dead, it won’t receive any charge. Also, if the alternator’s drive belt spins or the alternator is defective, the battery won’t charge.

Additionally, misadjustment of the regulating relay for voltage will also arise. Because if the preset level is lower than sufficient, the battery will consume less voltage.


  • Inspect the battery and replace it if it is not in sound condition
  • You have to repair the defective alternator 
  • To prevent the alternator’s drive belt from spinning, you need to get a level of sag from the drive belt. You can achieve this by stretching the drive belt
  • Adjust the voltage-regulating relay at a proper level
  • Repair the defective voltage-regulating relay

6. Slow Response Of The Brake

You will get a slow response after depressing the brake pedal. Sometimes, the brake pedal may feel spongy or inefficient. If air somehow enters the brake line, it will hinder the flow of brake fluid. 

Generally, the metal brake line can get worn and corrode easily, which may cause leakages. These leakages of brake fluid will lower the brake fluid level than the sufficient level. 

As a result, the brake pedal won’t get adequate hydraulic pressure, and the pedals will feel spongy.


  • Ensure a sufficient level of brake fluid
  • Repair or replace the cracked or damaged brake line to prevent leakages of brake fluid
  • Flush brake fluid of the braking system 

7. Poor Engine Output 

If the compression pressure isn’t sufficient in the cylinder, the engine output also becomes insufficient. Loose valves, bolts, or defective cylinder gaskets may cause a lack of compression pressure.

Moreover, if any nozzle of the fuel injector gets clogged and the injectors or the injector pump is not correctly adjusted. These may also cause this problem.


  • Check if all the gaskets, seals, valves, and bolts of the cylinder are tight or not
  • Tighten all the seals, gaskets, and valves of the cylinder to maintain adequate compression pressure
  • Clean the dirty nozzle and replace it if it is already damaged
  • Adjust the injectors and injector pump in the correct position 


It’s mandatory to fix the tractor problems as soon as you detect them. Otherwise, though the issues are not very serious initially, they will cause severe issues in the tractor over time. Throughout the article, we discussed the problems of the Zetor tractor along with their solutions.

All engine problems, such as starter motor and hydraulic brake problems, are easily solvable. If you can’t fix them yourself, you should seek professional mechanics or workshops to help you fix them. Besides, a user manual of this tractor will help you to understand the fixing process better.

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