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FJT Genset We specialize in diesel generator sets for construction, marine, and mining applications.

🔧 The Silent Killer in Overseas Generator Maintenance: Small Oil LeaksFellow technicians and overseas generator operator...
24/06/2026

🔧 The Silent Killer in Overseas Generator Maintenance: Small Oil Leaks
Fellow technicians and overseas generator operators — I’m sure many of you can relate.
We’re never afraid of major breakdowns. What really hurts is those small, sneaky oil leaks that get ignored during busy on-site work. By the time the leak becomes serious and triggers an alarm, you’re facing project delays and long shipping waits for spare parts.
Recently, I came across a clean and professional repair case from a Cummins generator in an overseas project. It’s a very typical pulley oil seal failure and the repair process is highly reusable.
Case: Chongqing Cummins Diesel Generator
Root Cause: Aging and failure of the oil seal on the water pump accessory drive pulley, causing persistent oil seepage and leakage.
Repair Process (Clean & Professional):

Removed the engine fan guard and thoroughly cleaned all accumulated oil sludge from the front end to ensure clear visibility and prevent contamination of the new seal.
Removed the drive belt and generator, then used special tools to carefully remove the accessory pulley — avoiding any force that could damage the shaft or mating surfaces.
Carefully extracted the damaged old oil seal and replaced it with a genuine factory-spec seal.
Reassembled all accessories strictly according to standard torque and alignment procedures.
After full reassembly, started the unit and performed complete load testing with the control panel. Confirmed zero oil leakage at the seal area and stable operation across all conditions.

Overseas projects often face harsh conditions — high temperature, high humidity, and salt fog — which significantly accelerate rubber seal aging. These minor leaks occur much more frequently than in inland environments.
Important Reminder:
If your daily inspections only focus on oil pressure and water temperature, you might easily miss early signs in the front drive area.
Question for the group:
Have you encountered similar oil seal leaks on overseas projects?
What’s your best practice for preventing and catching these early-stage leaks?
Share your experience and tips in the comments 👇 Let’s learn from each other.

Need reliable generator spare parts, technical support, or new units?
👉 Official Website: www.generatorunit.com
📧 Email: [email protected]

🔧 Classic “High Temperature + Power Loss” Generator Fault – Worth Learning FromJust saw a very well-handled repair case ...
23/06/2026

🔧 Classic “High Temperature + Power Loss” Generator Fault – Worth Learning From
Just saw a very well-handled repair case from a fellow technician. Sharing it with all the generator maintenance and operations guys in the group.
Unit: Yuchai 300kW Diesel Generator (420 series)
Symptoms:
Overheating – water temperature above 90°C
Poor load capacity + heavy black smoke under load
Troubleshooting Steps:
Started with the cooling system. Found the radiator and intercooler heavily clogged with dust and oil residue. After thorough cleaning, they tested again. At 70kW it was acceptable, but adding another 30kW (total 244A) caused struggling and black smoke again.
Further inspection revealed a severely clogged air filter, causing high intake resistance and incomplete combustion.
After replacing the air filter with a new one and retesting:
Final Result:
Combined load ~260A
Water temperature stabilized at a healthy 66°C
All parameters normal — overheating and black smoke completely resolved
Key Takeaway:
In dusty environments, radiator/intercooler blockage and air filter clogging often occur together and compound each other. Don’t only focus on oil and fuel filters — regular cleaning of the air filter and intercooler is critical.
Question for the group:
For generators running in high-dust conditions, how often do you inspect and clean the air filter and intercooler?
Any practical tricks to check intake restriction without full disassembly?
Share your experience in the comments 👇
Need reliable generator solutions, spare parts, or technical support?
👉 Official Website: www.generatorunit.com
📧 Email: [email protected]

22/06/2026

🔥 Old-School Salt Water Load Test on a 600V Methanol Generator – Still Works Great!
A fellow technician shared this interesting test recently, and I thought it was worth sharing with all the generator guys.
The unit was a 600V methanol-fueled generator — not the standard 380V. Regular load banks couldn’t match the voltage, so the team used a classic method: Salt Water Resistive Load Testing.
How they did it:

Filled a large tank with water and added 9 big bags of coarse salt
Welded three large steel plates as electrodes
Used a crane to lower the plates into the salt water — the deeper they went, the higher the load

They even joked that the salt concentration was strong enough to pickle vegetables! 😂
Safety was taken very seriously because methanol is highly flammable. The generator started smoothly on the first try. Voltage stayed stable at 600V / 50Hz. They gradually increased the load until reaching full capacity. The unit ran smoothly and passed the test on the first run.
It’s impressive how these traditional “low-tech” methods can still solve real problems when specialized equipment isn’t available.
Question for the generator community:
Have you ever used the salt water load bank method? Especially on high-voltage or special fuel generators — what safety tips do you recommend?
Share your experiences in the comments 👇

Need reliable generator solutions, spare parts, or technical support?
👉 Official Website: www.generatorunit.com
📧 Email: [email protected]

🔥 Old-School Salt Water Load Test on a 600V Methanol Generator – Still Works Great!A fellow technician shared this inter...
22/06/2026

🔥 Old-School Salt Water Load Test on a 600V Methanol Generator – Still Works Great!
A fellow technician shared this interesting test recently, and I thought it was worth sharing with all the generator guys.
The unit was a 600V methanol-fueled generator — not the standard 380V. Regular load banks couldn’t match the voltage, so the team used a classic method: Salt Water Resistive Load Testing.
How they did it:
Filled a large tank with water and added 9 big bags of coarse salt
Welded three large steel plates as electrodes
Used a crane to lower the plates into the salt water — the deeper they went, the higher the load
They even joked that the salt concentration was strong enough to pickle vegetables! 😂
Safety was taken very seriously because methanol is highly flammable. The generator started smoothly on the first try. Voltage stayed stable at 600V / 50Hz. They gradually increased the load until reaching full capacity. The unit ran smoothly and passed the test on the first run.
It’s impressive how these traditional “low-tech” methods can still solve real problems when specialized equipment isn’t available.
Question for the generator community: Have you ever used the salt water load bank method? Especially on high-voltage or special fuel generators — what safety tips do you recommend?
Share your experiences in the comments 👇
Need reliable generator solutions, spare parts, or technical support? 👉 Official Website: www.generatorunit.com
📧 Email: [email protected]

🔥 Just Tested a 1650kW Cummins KTA50-G16A Beast!Today we brought out the big one — a 1650kW Cummins KTA50-G16A diesel ge...
15/06/2026

🔥 Just Tested a 1650kW Cummins KTA50-G16A Beast!
Today we brought out the big one — a 1650kW Cummins KTA50-G16A diesel generator. When this monster sits in the workshop, you can feel the power.
V16 cylinder, 50-liter displacement, legendary PT fuel pump, six oil filters, four air filters, and dual redundant starters — everything built for true heavy-duty performance. A complete unit like this easily costs close to $400,000+.
We spent yesterday preparing all the wiring, actuators, shutdown solenoid, and speed sensors. We even made a direct starter jumper cable. The fuel lines are massive — one barrel of diesel doesn’t last long at full load.
When we hit the starter, it fired up smoothly on the first try.
Idle oil pressure was rock solid at 10.6 bar.
Under full load, the engine ran extremely stable with deep, powerful sound and zero shaking.
First-run test passed with flying colors. Ready for shipping and final auto-start control panel installation at the project site.
After so many years in this industry, working on these massive engines never gets old. There’s something special about that heavy, solid diesel power.
Who else works with big generators? What’s the largest unit you’ve ever tested or operated? Share in the comments 👇
Need a reliable high-power generator solution?
👉 Visit our website: www.generatorunit.com
📧 Email: [email protected]

A 300kW Yuchai diesel generator came in with a weird issue.The client said the unit had no power and was blowing heavy b...
12/06/2026

A 300kW Yuchai diesel generator came in with a weird issue.
The client said the unit had no power and was blowing heavy black smoke even at only 100A load. Normally this machine handles 400A smoothly.
We checked all the usual suspects first: fresh engine oil, brand new air filter, diesel filter — everything was clean. No blockages.
After staring at the engine for a while, I suspected the turbocharger. Opened it up… blades looked perfect, clearance was normal. Nothing obviously wrong.
Then I gave the impeller a light spin by hand — it was stuck and sluggish.
I manually rotated it a few times to loosen it up, reinstalled everything, and fired the unit again.
Result?
✅ Pulled straight up to 380A with zero black smoke
✅ Full power restored
✅ Ran perfectly smooth
Just a small stuck turbo impeller was killing the whole performance.
After doing this job for years, I’m still amazed at how a tiny issue can choke a powerful machine. Sometimes the simplest fix makes the biggest difference.
Have you ever encountered a strange generator fault that turned out to be something tiny?
Drop your stories or tag a friend who runs generators in their factory or project site 👇
I’m always happy to help with troubleshooting or maintenance.
👉 Official Website: www.generatorunit.com
📧 Email: [email protected]

🔧 On-Site Generator Repair: From No Power to Running Perfectly!Hey everyone, fellow technicians and business owners!Toda...
11/06/2026

🔧 On-Site Generator Repair: From No Power to Running Perfectly!
Hey everyone, fellow technicians and business owners!
Today I went to a client’s site to fix a diesel generator that started normally but had zero power output. The customer had already replaced the fuses and checked the AVR (Automatic Voltage Regulator), which showed clear burn marks.
I installed a brand-new AVR and double-checked all wiring. Started the unit again… still no voltage.
So I pulled out my multimeter and performed a full excitation circuit test. I even did a 24V external excitation test to confirm. That’s when we found the real problem — the excitation coil was completely open circuit (broken).
Once the root cause was identified, I replaced the entire full copper brushless alternator. After proper installation and wiring, we fired it up again:
✅ Engine speed stable at 1500 RPM
✅ Voltage and frequency back to normal
✅ Generator producing clean, stable power!
This is why proper troubleshooting matters. You have to go step by step instead of just replacing parts blindly.
Another “dead” generator brought back to life — and another happy client whose business can keep running smoothly.
Have you ever dealt with a generator that starts but doesn’t generate power? Drop your experience or questions in the comments below 👇
Need generator repair, maintenance, or a reliable new unit?
Feel free to message me or check our solutions here:
👉 Official Website: www.generatorunit.com
📧 Email: [email protected]

10/06/2026

Wind power can save fuel at sea — but marine power cannot rely on wind alone.

In this animation, we explain how a marine diesel generator set works together with wind power in a hybrid power system.

The logic is simple:

Wind power helps reduce fuel consumption.
The genset keeps voltage and frequency stable.
The PMS control system decides how much power each source should provide.

When wind is strong, the system uses more wind power.
When wind drops, the genset automatically fills the power gap.
When power changes suddenly, the control system keeps the marine load stable.

This is not just “connecting two power sources together.”
It is about synchronization, power sharing, and protection.

Wind saves fuel.
Genset stabilizes power.
PMS controls the system.

05/06/2026

Have You Ever Seen a Generator with Manual Throttle Lever?
This “old warrior” is already over 60 years old… yet it can still roar and generate power steadily!
This is the SDEC POWER Classic 4135 Diesel Generator Set.
Born in the 1960s, it was a milestone in China’s independent industrial development — one of the first fully domestically developed mid-to-high power diesel engines. At that time, it filled a critical gap in China’s power generation equipment and delivered reliable electricity to factories, mines, infrastructure projects, and rural grids across the country.
Back then, there was no electronic control, no automatic throttle, and no smart screens.
Only a simple manual throttle lever — pulled by hand, relying entirely on the experienced master’s skill and intuition.
Today, we brought this legend back to life at the exhibition. The moment the manual throttle was slowly pulled, and the deep, powerful rumble of the engine filled the hall… many veteran engineers got tears in their eyes.
This isn’t just an old generator.
It’s a living witness to China’s power industry — from nothing to something, from weak to strong.
A piece of industrial memory built with the sweat and dedication of generations of pioneers.
The SDEC 4135 series represents more than history — it carries a spirit:
Reliable. Tough. Built to last.
We pay tribute to all the predecessors who fought for China’s power industry!
And to every old machine that is still standing strong.
Manual throttle operation video is posted below — feel the history!
Comment below:
What’s the oldest generator you’ve ever seen or operated? Tell us the year!
👉 More classic power stories and modern SDEC generators coming soon.

03/06/2026

🔥 Shanghai Power Show!
This massive vertical remote radiator immediately stands out with serious presence!
Featuring 6 high-volume axial fans in a vertical layout, complete with a built-in maintenance ladder, heavy-duty industrial construction — this is clearly a hardcore cooling solution built for real high-power generators.
So what problems does it solve?

Cooling for large diesel generator sets
Insufficient heat dissipation in high-temperature environments (45°C+)
Projects with limited engine room space that need the radiator installed outdoors

This is a true “heavy-duty power carrier” cooling system — far beyond those small ordinary radiators.
After seeing it in person, it reinforced one clear truth:
Choose the right cooling system, and your generator can truly run reliably for the long term.
👉 More live shots and professional configurations coming soon!

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