Generator brands · Engines
Kubota-Engined Generators Repaired and Serviced On Site
We repair, service and maintain generators with Kubota engines on site across Gauteng, from small home standby sets to the compact three-phase units behind shops, offices and telecom sites. These are small water-cooled diesels, usually inside a silent canopy, and their faults mostly come down to starting, fuel and heat. We find the cause, put it right and prove the set under load before we leave.
Established 2006
20 years of experience
24/7 operations
We Arrive Within 1–2 Hours
(usually within 1 hour)
Free callouts and quotations
One-year warranty
Qualified and certified technicians
We Service & Repair All Generator Brands
All generator makes and models
1 kVA–20,000 kVA capability
Compact sets
Where Kubota engines turn up
Kubota builds small industrial diesel engines, and generator builders choose them for compact sets because they run quietly, smoothly and economically. Builders such as Atlas Copco and Himoinsa have used Kubota engines in some of their smaller sets. Most Kubota-powered generators carry the set builder’s name on the canopy, so the Kubota name usually appears only on the engine itself, on the rocker cover or the engine plate.
These engines power sets from about 5 kVA up to roughly 40 kVA. You find them beside houses and townhouses, behind shops, surgeries and offices, and on telecom sites where small sets run unattended for long hours. In the same size range you will also meet Yanmar and Perkins 400-series engines, and compact sets such as Kipor’s that use their builder’s own engines.
The photo shows a compact silent diesel set with its door open: the kind of engine bay a Kubota engine sits in, not a Kubota engine itself.
- Water-cooled, two to four cylinders in line
- Mostly 1,500 rpm; some of the smallest sets run at 3,000 rpm
- Often packed tightly into a sound-proofed canopy
Reading a Kubota engine model
| Part of the model | What it tells you | Example |
|---|---|---|
| First letter Z, D or V | What it tells youCylinders: Z is two, D is three and V is four, all in line | ExampleZ482, D1105, V2203 |
| The digits | What it tells youRoughly the displacement in cubic centimetres | ExampleA D1105 is about 1.1 litres; a V3300 about 3.3 litres |
| T after the number | What it tells youA turbocharged version of the engine | ExampleV1505-T |
| Serial number | What it tells youThe exact build of that engine | ExampleOn the engine plate |
Two engines with the same model name can differ in fuel system and parts, so we record the serial number too.
What goes wrong on Kubota-engined sets
| Symptom | Likely causes | Repair route |
|---|---|---|
| Hard starting and white smoke on cold mornings | Likely causesA failed glow plug, glow relay or preheat timer, or a weak battery whose voltage collapses while cranking | Repair routeGenerator not starting |
| Fires while cranking, then dies as soon as the starter stops | Likely causesThe fuel stop solenoid or its supply: a solenoid that pulls in during cranking but cannot hold in afterwards cuts the fuel the moment cranking ends | Repair routeShutting down or tripping |
| Will not restart after running out of diesel | Likely causesAir in the filter, fuel lines and injection pump, which has to be bled out | Repair routeFuel system repairs |
| High-temperature shutdown inside a silent canopy | Likely causesDust-packed radiator, slipping fan belt, or hot outlet air being drawn back into the canopy | Repair routeOverheating |
| Oily black residue at the exhaust after long evening runs | Likely causesRunning far below rated load, so fuel is not burnt completely | Repair routeWet stacking |
Load shedding, light loads and hot canopies
Many small Kubota-engined sets were bought for the odd outage and end up running for hours a day during load shedding, often carrying only lights, a fridge and the television. Oil and filters reach their service hours far sooner than the calendar suggests, and an engine working at a small fraction of its rating never gets hot enough to burn its fuel completely: soot builds up, the oil is diluted and the set starts to smoke. A service, a proper run under load and, where the set is far bigger than the house needs, an honest look at kVA sizing usually put it right.
Heat is the other enemy. A compact canopy leaves little room around the radiator, and a set squeezed into a side passage can breathe its own hot air. A small sump and cooling system have less in reserve, so a clear inlet and outlet and a clean radiator core matter more here than on a large engine. Our generator repairs start from that cause, not the symptom.
What a Kubota engine service includes
A service follows the engine’s maintenance schedule, by running hours or by date, plus the checks a compact canopied set needs:
- Oil and filter changed, with the level set carefully in the small sump
- Fuel filter replaced, any water separator drained and the fuel system bled
- Air filter cleaned or replaced, and the intake checked for dust leaks
- Glow plugs and glow relay tested, ideally before the Highveld winter
- Fan belt, which also turns the water pump and charge alternator, checked and tensioned
- Coolant strength and level, hoses and the radiator core
- Valve clearances checked and adjusted at the interval the engine manual gives
- Battery, charger, and the controller’s alarms and shutdowns tested
- A run under load, with voltage and frequency checked
Parts are chosen from the engine model and serial number: genuine Kubota parts or quality-equivalent parts made to the same specification, and the quote says which. For sets that run most days, a maintenance plan keeps the hours in check.
Independent service
We Service & Repair All Generator Brands
Onsite Generator Repairs is an independent generator specialist. We repair, service and maintain Kubota equipment as part of our work on every make of generator.
Manufacturer warranty claims go through the manufacturer’s own network. If your generator is still under warranty, check the warranty terms before arranging work by anyone else.
Brand names and trademarks belong to their respective owners. Onsite Generator Repairs is an independent service and repair company.
Service areas
Where we work in Gauteng
FAQ
Frequently asked questions
Why does my Kubota generator need to “heat” before starting?
Most small Kubota engines have glow plugs that warm the combustion chambers so the first fuel ignites. An automatic set preheats by itself; on a key start, hold the preheat position for the time in the manual, longer on a cold morning. If preheating no longer helps, a glow plug or the glow relay has probably failed.
It starts, then dies as soon as I let go of the key. What is wrong?
Usually the fuel stop solenoid or its supply: it pulls in while the starter turns but cannot hold in afterwards. A genuine low oil pressure shutdown can look similar, so check the oil level with the engine stopped, then call us rather than trying again and again.
How often should a home generator with a Kubota engine be serviced?
At the running-hours interval in the engine manual, or once a year if the hours have not been reached. During heavy load shedding a home set can reach its hours within a few months, so go by the hour meter, not the calendar.
What should I send when I book?
A photo of the engine plate or model label, the set’s kVA rating, the hour-meter reading and, if the controller shows an alarm, a photo of the screen. That lets the technician bring the likely parts on the first visit.
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Who we work for
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- 24/7 operations
- We Arrive Within 1–2 Hours (usually within 1 hour)
- Free callouts and quotations