Diesel generator repairs

Diesel Generator Repairs in Gauteng

Mr Generator provides professional diesel generator repairs in Gauteng for residential, commercial and industrial generator systems. We diagnose and repair diesel generator problems involving the engine, fuel system, cooling system, starting system, alternator, voltage regulation, electrical system and generator control panel.

If your diesel generator will not start, keeps shutting down, overheats, produces unstable voltage, struggles under load or has developed another fault, proper fault finding is important before replacing components.

Mr Generator provides diesel generator repair and technical services across Gauteng, including Johannesburg, Pretoria, Kempton Park and surrounding areas.

Contact Mr Generator |
WhatsApp 067 266 0757 |
Call 067 266 0757

Professional Diesel Generator Repairs

Diesel generators combine a diesel engine with an alternator and electrical control system. A fault in one part of the system can affect the operation of the complete generator.

Our diesel generator repair service focuses on identifying the cause of the problem and determining the appropriate repair or replacement of faulty components.

We can assist with diesel generator problems involving:

  • Starting and cranking problems
  • Engine faults
  • Fuel-system problems
  • Fuel delivery problems
  • Overheating
  • Cooling-system faults
  • Low or unstable voltage
  • Alternator faults
  • AVR and voltage-regulation problems
  • Battery and charging-system faults
  • Control-panel faults
  • Generator shutdowns and alarms
  • Electrical faults
  • Generator failure under load
  • Abnormal noise or vibration

Diesel Generator Problems We Repair

Diesel Generator Will Not Start

A diesel generator that does not start can have several possible causes. Problems may involve the battery, starter system, fuel supply, fuel delivery, engine controls or another component.

We diagnose the starting problem rather than assuming that one component is responsible.

Diesel Generator Starts and Then Stops

A generator that starts and shuts down may have a fuel-supply problem, protection alarm, sensor issue, overheating condition, low oil-pressure condition or another control-system fault.

Proper fault finding is required to identify the cause of repeated shutdowns.

Diesel Generator Overheating

Overheating can affect diesel generator reliability and may be caused by problems involving coolant, radiator performance, hoses, belts, airflow, water circulation or other cooling-system components.

The cooling system should be inspected before the generator is returned to normal operation.

Diesel Generator Producing Low Voltage

Low generator voltage can have several causes, including alternator problems, voltage-regulation faults, electrical connections or other generator-system issues.

Testing can help determine whether the problem is related to the alternator, AVR, wiring, control system or another component.

Diesel Generator Producing Unstable Voltage

Unstable voltage can affect equipment connected to the generator. Possible causes can include voltage-regulation problems, alternator faults, engine-speed problems or electrical-system issues.

Diesel Generator Losing Power Under Load

A generator that runs normally without load but struggles when electrical demand increases may have an engine, fuel, air, alternator or control-system problem.

Load-related testing can help identify problems that may not be obvious during a simple no-load run.

Diesel Generator Fuel System Repairs

The fuel system is essential to diesel-engine operation. Fuel restrictions, contaminated fuel, filter problems, fuel-delivery faults or other fuel-system issues can cause starting and performance problems.

Mr Generator can inspect diesel generator fuel-system problems and determine the appropriate repair or maintenance requirements.

Diesel Generator Engine Repairs

Diesel generator engine problems can affect starting, engine speed, power output and overall generator performance.

Depending on the fault, engine-related checks may include lubrication, cooling, fuel delivery, belts, hoses, engine operation and other relevant components.

Diesel Generator Alternator and AVR Repairs

The alternator produces the generator’s electrical output, while the voltage-regulation system helps control electrical voltage.

Alternator or AVR problems can result in low voltage, unstable voltage or failure to produce the required electrical output.

Mr Generator can investigate generator electrical-output problems and determine whether repair, component replacement or additional testing is required.

Diesel Generator Battery and Charging Problems

A reliable starting battery and charging system are important for standby generators. A weak battery or charging fault can leave a generator unable to start when backup power is required.

Battery condition, terminals, charging components and the starting system can be checked during generator diagnosis and maintenance.

Diesel Generator Control Panel Repairs

Modern diesel generators often use electronic control systems to monitor engine operation, electrical output, alarms and shutdown conditions.

Control-panel faults can result in warning alarms, unexpected shutdowns or incorrect generator operation. Fault finding should identify the actual cause before components are replaced.

Diesel Generator Electrical Repairs

Generator electrical problems can involve the alternator, AVR, wiring, connections, sensors, control systems and other electrical components.

Electrical testing and fault finding can help determine the source of a generator’s electrical problem.

Diesel Generator Brands We Work On

Mr Generator can work on a range of diesel generator systems. Depending on the generator model, fault and availability of suitable components, brands may include:

  • Cummins
  • Perkins
  • Caterpillar
  • FG Wilson
  • Volvo Penta
  • John Deere
  • Doosan

Brand and model support can vary. Contact Mr Generator with the generator make, model and fault description so that the requirements can be assessed before work is undertaken.

Diesel Generator Servicing and Preventative Maintenance

Regular maintenance can help identify developing problems before they result in an unexpected generator failure.

Our Generator Servicing & Maintenance in Gauteng page explains our preventative maintenance services in more detail.

Generator maintenance may include:

  • Engine inspection
  • Oil and filter maintenance
  • Cooling-system checks
  • Fuel-system inspection
  • Battery and charging-system checks
  • Alternator inspection
  • Electrical checks
  • Control-panel checks
  • Operational testing
  • Load testing where required

Diesel Generator Load Testing

A generator can sometimes appear to operate normally without a significant electrical load. Load testing provides a way of assessing generator performance under controlled load conditions.

For more information about our broader generator services, visit our
Generator Services in Gauteng page.

Commercial and Industrial Diesel Generator Repairs

Diesel generators are widely used for backup power in commercial and industrial environments. A generator failure can affect business operations, equipment and essential services.

Mr Generator provides diesel generator repair support for suitable applications including:

  • Factories
  • Warehouses
  • Workshops
  • Office buildings
  • Retail premises
  • Industrial facilities
  • Commercial properties
  • Residential backup-power systems

Diesel Generator Repairs Across Gauteng

Mr Generator provides diesel generator repair services across Gauteng, including Johannesburg, Pretoria, Kempton Park and surrounding areas, subject to technician availability and the requirements of the job.

Diesel Generator Repairs in Johannesburg

We provide diesel generator fault finding, repairs, servicing and maintenance support in Johannesburg and surrounding areas.

Diesel Generator Repairs in Pretoria

Mr Generator provides diesel generator repair and maintenance support in Pretoria and surrounding areas for suitable residential, commercial and industrial applications.

Diesel Generator Repairs in Kempton Park

We also provide diesel generator repair and servicing support in Kempton Park and surrounding areas.

When Should You Call a Diesel Generator Technician?

It is advisable to have a generator inspected when you notice a change in its normal operation.

  • The generator will not start
  • The generator starts and shuts down
  • The engine overheats
  • Voltage is low or unstable
  • The generator struggles under load
  • The generator produces unusual noise or vibration
  • Warning alarms appear
  • The battery repeatedly goes flat
  • The generator is using fuel differently from normal
  • The generator has not been serviced for an extended period

Frequently Asked Questions About Diesel Generator Repairs

Why won’t my diesel generator start?

A diesel generator may fail to start because of battery, starting-system, fuel-system, control-system or engine-related problems. Proper diagnosis is needed to identify the actual cause.

Why does my diesel generator start and then stop?

Repeated shutdowns can be caused by fuel problems, protection alarms, sensor faults, overheating, low oil pressure or control-system problems. The generator should be diagnosed to identify the cause.

Why is my diesel generator producing low voltage?

Low voltage can be caused by alternator, AVR, engine-speed, wiring, connection or control-system problems. Testing is required to identify the specific fault.

Do you repair Cummins diesel generators?

Mr Generator works on a range of diesel generator systems. Contact us with the Cummins generator model and fault details so that the specific repair requirements can be assessed.

Do you repair Perkins diesel generators?

Perkins-powered generator systems can be assessed for diesel-engine, fuel, cooling, electrical and generator-system faults. Contact Mr Generator with the model and problem details.

Do you repair commercial and industrial diesel generators?

Yes. Mr Generator provides diesel generator repair and maintenance support for suitable commercial and industrial applications.

Can you service a diesel generator as well as repair it?

Yes. Mr Generator provides both diesel generator repairs and preventative servicing. Visit our generator servicing and maintenance page for more information.

Contact Mr Generator for Diesel Generator Repairs

If your diesel generator is not starting, overheating, producing unstable voltage, shutting down or struggling under load, contact Mr Generator for generator repair and fault-finding assistance.

Phone: 067 266 0757

WhatsApp: WhatsApp Mr Generator

Website: Mr Generator

Contact Mr Generator for diesel generator repairs, servicing and maintenance in Gauteng.

Generator Safety

Generator repairs, electrical work and generator installations should be performed appropriately for the specific equipment and installation. For official electricity-related information in South Africa, you can also refer to Eskom.