Eight Troubleshooting Steps Every Mechanic Should Know: 2026 Mining Industry Guide

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 Eight Troubleshooting Steps Every Mechanic Should Know: 2026 Mining Industry Guide

Machine troubleshooting is a fundamental skill that every mechanic must master, whether they are a beginner or an experienced professional. Without a systematic method, the process of identifying a failure can take a long time, increase repair costs, and even result in an incorrect diagnosis.

In the field, many mechanics immediately replace components without conducting a proper analysis. However, correct troubleshooting is not about guessing. It is a logical and step-by-step thinking process used to accurately identify the root cause of a problem.

By following the correct troubleshooting steps, the repair process becomes more efficient, working time can be reduced, and the risk of mistakes can be minimized. This is what distinguishes a professional mechanic from an ordinary mechanic.

In this article, I will discuss eight systematic and practical machine troubleshooting steps that can be applied in the workplace. This method can be used for various types of machinery, including heavy equipment, operational vehicles, and industrial units.

To improve your diagnostic skills and work more effectively in the field, understand and apply the following steps in the correct order.

In the mining industry, especially in the Plant Department, troubleshooting skills are extremely important. This article discusses eight troubleshooting steps commonly used in the mining industry.

Before discussing troubleshooting in greater detail, we first need to understand what troubleshooting means.

Troubleshooting is the process of finding and identifying a problem. Its purpose is to ensure that the same problem does not happen again.

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Eight Troubleshooting Steps Every Mechanic Should Know

1. Troubleshooting Chart

This is the process of collecting initial data. Information is gathered about the type of failure, when the failure occurred, and how many failures have been reported.

The troubleshooting chart helps mechanics organize information before beginning the inspection process.

Important information that should be included includes:

• The reported symptom

• The time the failure occurred

• The machine’s operating condition

• The number of similar failures

• Previous repair history

• Components or systems that may be related to the problem

By using a troubleshooting chart, the inspection process becomes more structured and easier to follow.

2. Possible Causes

Before carrying out an inspection, analyze similar failures that have occurred previously.

A single symptom may have several possible causes. Therefore, mechanics should not immediately conclude that one specific component is damaged.

For example, an engine that cannot start may be caused by:

• A weak battery

• Loose or damaged cables

• A faulty starter motor

• Insufficient fuel supply

• Air inside the fuel system

• A damaged sensor

• An electrical-system problem

List all possible causes and arrange them from the easiest to inspect to the most difficult.

Previous failure reports, maintenance records, fault-code history, and repair reports can help identify the most likely cause.

3. Observation and Diagnosis

When a failure is reported, the mechanic should not immediately dismantle the machine.

First, ask for specific information about the problem.

Questions that can be asked include:

• What problem occurred?

• When did the problem begin?

• Did it happen suddenly or gradually?

• Did the problem occur when the machine was cold or hot?

• Was the machine operating under load?

• Were there any warning lights or fault codes?

• Was there any unusual sound, vibration, smoke, smell, or leakage?

• Has the same problem happened before?

After interviewing the operator, carry out a visual inspection.

Check for:

• Loose cables

• Damaged connectors

• Oil or fuel leaks

• Broken hoses

• Low fluid levels

• Loose bolts

• Damaged sensors

• Blocked filters

• Unusual sounds

• Abnormal exhaust smoke

Observation and preliminary diagnosis can often identify simple problems without immediately dismantling major components.

4. Data Collection

Collect specific data about the failure.

Identify what kind of problem occurred, when it happened, under what operating condition it appeared, and whether the same problem had occurred previously.

The more accurate the data collected, the easier it will be to determine the root cause.

Data that may need to be collected includes:

• Engine speed

• Battery voltage

• Fuel pressure

• Engine oil pressure

• Coolant temperature

• Hydraulic pressure

• Transmission pressure

• Sensor voltage

• Fault codes

• Machine operating hours

• Maintenance history

• Previous repair history

• Oil-analysis results

• Abnormal sound or vibration

• Machine cycle time

The collected data should be compared with the manufacturer’s specifications.

Measurements should also be taken under the same conditions in which the failure occurs.

For example, if a hydraulic system becomes weak after the oil becomes hot, the system should be tested when the hydraulic oil has reached its normal operating temperature.

5. Data Analysis

After the data has been collected, analyze the report carefully.

Observe the type of repair that has previously been performed and compare the new findings with previous failures.

Data analysis may include comparing:

• Actual test results with manufacturer specifications

• Current conditions with previous inspection results

• The affected machine with similar machines

• Current symptoms with known failure patterns

• Fault codes with physical inspection results

• Oil-analysis results with component condition

The purpose of data analysis is to eliminate possible causes that are not supported by evidence.

For example, if battery voltage is normal but the starter motor rotates slowly, the problem may be caused by excessive resistance in the cable or a faulty starter motor.

If hydraulic pressure is normal but the movement is slow, the problem may be related to insufficient hydraulic flow or internal leakage.

Good data analysis prevents mechanics from replacing components unnecessarily.

6. Suspected Cause

After collecting and analyzing the data, the mechanic will be able to determine the most likely cause of the failure.

The suspected cause must then be verified through appropriate testing.

Verification may include:

• Pressure testing

• Flow testing

• Electrical testing

• Voltage-drop testing

• Sensor testing

• Compression testing

• Leakage testing

• Case-drain testing

• Functional testing

• Component isolation

• Comparing the suspected component with a known-good component

For example, if a hydraulic pump is suspected, do not immediately replace it. Confirm its condition by performing a pressure test, flow test, cycle-time test, and case-drain test.

If a sensor is suspected, compare the sensor reading with an external measuring instrument.

The purpose of verification is to prove whether the suspected cause is correct.

7. Conclusion

After identifying the cause of the failure, a conclusion can be made.

The conclusion helps determine the repair steps that need to be taken.

A good troubleshooting conclusion should explain:

• The original problem

• The inspection that was performed

• The test results

• The confirmed cause

• The damaged component or system

• The recommended repair

• The preventive action required

The conclusion should not only state that a component is damaged. It should also explain why the component failed.

For example:

“The engine could not start because the starter motor did not receive sufficient voltage during cranking. Battery voltage was normal, but voltage-drop testing showed excessive resistance at the positive cable terminal due to corrosion.”

A clear conclusion makes the repair process easier to understand and document.

8. Corrective and Preventive Action

Before carrying out the repair, the proposed corrective action should be discussed with the team.

The maintenance team should determine the best repair action and consider whether the same failure could happen again after the repair.

Corrective actions may include:

• Repairing damaged wiring

• Replacing a faulty component

• Cleaning electrical connections

• Replacing blocked filters

• Adjusting system pressure

• Repairing internal leakage

• Flushing a contaminated system

• Calibrating sensors or injectors

• Updating software

• Improving component installation procedures

After the repair has been completed, conduct a functional test.

Make sure that:

• The original problem has disappeared

• No new fault codes are present

• The machine operates normally

• System pressure is within specification

• Temperature is stable

• No leakage is present

• The repaired component functions correctly

Preventive action should also be implemented to prevent the same failure from recurring.

Preventive actions may include:

• Improving preventive-maintenance schedules

• Performing regular inspections

• Monitoring oil-analysis results

• Improving contamination control

• Training operators

• Improving maintenance procedures

• Recording repair history

• Monitoring machine-performance data

Troubleshooting is not complete until the repair has been tested and the possibility of repeated failure has been minimized.

Troubleshooting Chart and How to Read It

What Is a Troubleshooting Chart?

A troubleshooting chart is a guide that helps mechanics solve problems in machinery or equipment.

It contains structured steps for diagnosing and resolving a problem.

A troubleshooting chart helps mechanics perform inspections in a logical order instead of checking components randomly.

Components of a Troubleshooting Chart

Question

This is the initial information collected from the operator or equipment user regarding the symptoms of the problem.

Examples of questions include:

• What problem occurred?

• When did it happen?

• Was the machine under load?

• Was the engine hot or cold?

• Did a warning code appear?

• Was there any unusual sound or vibration?

Check Item

This is a list of components or systems that need to be inspected.

The purpose is to identify the cause of the problem.

Check items may include:

• Battery condition

• Cable connections

• Fuel pressure

• Air-filter condition

• Hydraulic pressure

• Sensor signals

• Oil condition

• Coolant level

• Wiring continuity

• Starter-motor operation

Corrective Action

This section contains the recommended repair steps based on the inspection results.

Corrective actions may include:

• Charging or replacing the battery

• Repairing damaged wiring

• Replacing a blocked filter

• Repairing the starter motor

• Calibrating the fuel-injection system

• Replacing a damaged sensor

• Cleaning electrical terminals

• Repairing a leaking hose

Troubleshooting Case Examples

Case 1: The Engine Cannot Be Started

Potential Causes

• The battery is weak or damaged.

• The connecting cables are loose, corroded, damaged, or broken.

• The starter system is faulty.

• The starter relay is damaged.

• The fuel supply is insufficient.

• Air is trapped inside the fuel system.

• The engine-speed sensor is not functioning.

• The neutral-safety system is not operating correctly.

Solutions

• Check the battery condition and recharge or replace it if necessary.

• Perform a battery load test.

• Make sure all cable connections are properly installed.

• Check for corrosion or physical damage to the cables.

• Measure the voltage drop during cranking.

• Check the starter relay and starter motor.

• Confirm that fuel is reaching the engine.

• Bleed air from the fuel system if necessary.

• Read active and stored fault codes.

• Repair or replace the starter component only after the failure has been confirmed.

Case 2: Black Smoke From the Exhaust

Potential Causes

• Insufficient air is entering the combustion chamber.

• Excessive fuel is being injected.

• The fuel-injection system is damaged or inaccurate.

• The air filter is blocked.

• The turbocharger is not operating properly.

• Boost pressure is too low.

• The injector is damaged.

• The engine is operating under excessive load.

• The exhaust system is restricted.

Solutions

• Clean or replace the blocked air filter.

• Inspect the intake hoses and clamps.

• Check the turbocharger condition.

• Measure the boost pressure.

• Verify fuel-system performance, including injector pressure.

• Test the injectors.

• Calibrate or repair the fuel-injection system according to the technical manual.

• Check whether the machine is being operated under excessive load.

• Inspect the exhaust system for restrictions.

Case 3: Abnormal Engine Vibration or Engine Hunting

Potential Causes

• Air is trapped inside the fuel system.

• The fuel supply is restricted.

• The fuel is contaminated.

• The engine-speed sensor is damaged.

• Fuel pressure is unstable.

• The governor is not operating properly.

• The injectors are unbalanced.

• There is a problem in the electronic-control system.

• Electrical connections are loose.

Solutions

• Bleed or remove air from the fuel system.

• Check the fuel-filter condition.

• Inspect the fuel lines for leaks.

• Check fuel quality.

• Measure the fuel-supply pressure.

• Inspect and replace the engine-speed sensor if it is proven to be faulty.

• Check active and stored fault codes.

• Perform an injector balance test.

• Inspect the governor or electronic-control system.

Conclusion

Troubleshooting ability is a critical competency for every mechanic and technician.

By following systematic troubleshooting steps, technical problems can be solved more quickly and accurately.

Mechanics should also learn how to use a troubleshooting chart to improve diagnostic efficiency.

In addition, regular maintenance must be performed to minimize the risk of machine failure.

The eight troubleshooting steps are:

1. Prepare a troubleshooting chart.

2. Identify all possible causes.

3. Perform observation and diagnosis.

4. Collect accurate data.

5. Analyze the data.

6. Determine and verify the suspected cause.

7. Draw a conclusion.

8. Perform corrective and preventive action.

Correct troubleshooting is not about guessing which component is damaged.

It is a process of collecting evidence, performing measurements, analyzing results, confirming the root cause, and implementing corrective action.

A professional mechanic does not only repair the machine. A professional mechanic also makes sure that the same failure does not happen again.

Frequently Asked Questions

What is troubleshooting in the mining industry?

Troubleshooting is a systematic process used to find, analyze, and repair problems in machinery or systems so that the same failure does not occur again.

Why is troubleshooting important in the Plant Department?

Troubleshooting is important because heavy-equipment downtime directly affects production, operating costs, equipment availability, and workplace safety.

What is a troubleshooting chart?

A troubleshooting chart is a step-by-step guide used to diagnose problems based on symptoms, inspection points, possible causes, and recommended corrective actions.

What is the first step in the troubleshooting process?

The first step is to collect initial information regarding the type of failure, the time it occurred, and the condition of the equipment when the problem appeared.

What are the common causes of an engine that cannot be started?

Common causes include a weak battery, damaged cables, a faulty starter system, insufficient fuel supply, air in the fuel system, or sensor problems.

Why does an engine produce black smoke?

Black smoke is commonly caused by incomplete combustion due to excessive fuel, insufficient air, low boost pressure, blocked air filters, or problems in the fuel-injection system.

What is engine hunting?

Engine hunting is a condition in which the engine speed fluctuates or becomes unstable. It may be caused by problems in the fuel system, air inside the fuel lines, sensor failure, injector imbalance, or governor problems.

How can repeated failures be prevented?

Repeated failures can be prevented through regular maintenance, root-cause analysis, proper repair procedures, condition monitoring, oil analysis, operator training, and preventive action after the repair.