Before running
- Visible fuel, oil or coolant leaks
- Fuel level
- Oil level
- Coolant level
- Alarms already on the controller
Diesel maintenance
Diesel Generator Maintenance Checklist
This is a general maintenance guide for diesel generator sets. It is not a manufacturer instruction, and it is not the same list as a petrol service. Diesel maintenance is about fuel that can hold water and dirt, a battery that must crank a compression engine, and a cooling system that has to survive loaded running. Daily checks below are what an operator can look at. They are not a repair procedure.
- Diesel fuel, water and filters
- Not a petrol checklist
- The engine manual still sets the interval
- Onsite across Gauteng
Readiness, not only an oil change
What belongs on a diesel maintenance list?
Before a run, look for leaks, check fuel, oil and coolant levels, and read any alarm already on the controller. Those are observations. They do not include opening a hot radiator or bridging a shutdown.
Periodic work adds oil and filters, the water separator where the engine has one, air filter, belts, hoses, battery, charger and terminals. Fuel condition matters more on diesel than on many petrol sets: water, dirt and aged diesel block filters and upset injectors.
Voltage, frequency and how the set behaves under load are the output checks. A load bank test is booked when a start in the plant room is not enough to prove capacity. Intervals for all of this are explained on the service intervals page, and they still come from the engine schedule.
Diesel-specific attention
Fuel, control and output
Diesel condition
Water, dirt and microbial growth show up as blocked filters, hard starting and smoke. The tank and the separator are part of maintenance, not only the spin-on filter.
Lift pump and injector symptoms
A set that cranks and starves, or that smokes and runs rough, is noted. Those symptoms are diagnosed. They are not adjusted with an injection calibration during a checklist visit.
Controller and ATS
Alarms, service hours and whether the set is left in automatic. An ATS test belongs on a standby set that has one, done as a controlled check.
Load and output
Voltage and frequency at run, and load behaviour if the site can apply load safely. A no-load idle does not prove a diesel that must carry a building.
Diesel maintenance checks
Operator checks are visual and level checks. Filter changes, electrical tests and anything under the cooling cap are for the service visit.
Periodic engine checks
- Engine oil
- Oil filters
- Fuel filters
- Water separator where fitted
- Air filter
- Belts and hoses
- Coolant and radiator
- Battery, charger and terminals
Fuel system
- Diesel condition
- Water or contamination
- Tank condition
- Fuel lines
- Lift-pump symptoms if it starves
- Injector symptoms if it smokes or runs rough
Control and output
- Controller alarms
- Hour reading
- Automatic mode if it is a standby set
- ATS operation where fitted
- Voltage and frequency
- Load performance, or a load-bank test when capacity is the question
Related Pages
Diesel repairs, servicing and intervals
- Diesel Generator RepairsWhen maintenance finds a fault
- Generator MaintenanceOngoing readiness
- Generator ServicingThe scheduled service visit
- Service IntervalsHours and calendar limits
- Load Testing GuideWhy a loaded test is different
- Service ChecklistThe general, not diesel-only, list
- Industrial Generator RepairsLarger diesel plant on a programme
- Contaminated DieselChecking stored fuel condition
Google reviews of ProService Generator Repairs
Google Review
Affordable and highly competent servicing for our FAW diesel generator. They carry the right FAW spares, meaning our breakdown was resolved in just a few hours.
Google Review
Very discreet and professional service for our property in Waterkloof. They managed the oil change and load test with zero mess or disruption.
Common Questions
Questions about diesel generator maintenance
How is this different from the general service checklist?
The general list covers diesel and petrol service scope. This list stays on diesel fuel, water separation, and the way a diesel standby set is kept ready.
Does this replace the manufacturer schedule?
No. It is a general guide. Intervals and capacities come from that engine’s schedule.
What can I check myself?
Levels, obvious leaks and whether an alarm is already showing, with the engine stopped. Not the cooling cap when it is hot, and not the fuel-injection system.
How often is this list done?
Some items are before a run. Others follow the hour or calendar interval for that engine. There is no single diesel interval on this page.
Should water in the fuel be drained?
Where a separator is fitted, water is part of maintenance. How it is drained depends on that separator. It is not a reason to open high-pressure lines.
Does maintenance include injector replacement?
No. Rough running or smoke is reported and diagnosed. Injector work is a separate decision.
Is a load bank test part of maintenance?
It is used when you need to know the set can carry a defined load. It is not bundled into every oil change.
What should I record?
The hour reading, the date, and any alarm. Those three make the next interval meaningful.
Still unsure what the fault is? Call or WhatsApp 082 057 4605 for onsite diagnosis.
Service Areas
Onsite visits across Gauteng
Technicians travel to the generator. These are the main Gauteng areas. Suburb pages sit under each region.
What to send before we attend
ProService Generator Repairs confirms an onsite visit from these details. Send what you have. A missing model number does not stop the booking.
- Location
- The suburb or site, so the visit can be booked in the right area.
- Make and model
- The generator brand and model, if they are known.
- kVA
- The size printed on the data plate.
- Fuel type
- Diesel, petrol, LPG, natural gas, or dual-fuel.
- Controller model
- The module name on the panel, when it is visible.
- Fault or alarm
- What the set does, and any text on the screen.
- Photos
- The generator, the data plate, and the controller or alarm. Send these on WhatsApp.
Book a Visit
Book diesel maintenance
Send the kVA, the hour reading and whether it is standby or running most days.
- Call
- 082 057 4605
- Message us on WhatsApp