Yanmar’s small and medium-sized diesel engines are technologically advanced, backed by over a century of R&D experience.
Yanmar engine sets are typically compact, powerful, and suitable for installation in space-constrained locations.
Our Yanmar generator sets, assembled using ELECPRIME generators, combine the high power, low fuel consumption, and high durability of Yanmar engines, making them a top choice for primary/standby power.
To help you better understand ELECPRIME Yanmar generator sets, we have compiled this FAQ guide, hoping to assist you in selecting the right Yanmar generator.
Thank you!

What are the warranty and after-sales service terms for ELECPRIME Yanmar generator sets?

1. ELECPRIME Yanmar generators come with a 2-year or 2000-hour warranty.
2. ELECPRIME provides on-site or remote video installation guidance for your Yanmar generator set.
3. ELECPRIME provides a detailed user manual for your Yanmar generator set.
4. In case of malfunction during the warranty period, ELECPRIME will inspect the generator and provide free genuine Yanmar parts.
5. ELECPRIME will regularly follow up on your usage and maintenance, providing suggestions to prevent unnecessary malfunctions.

What are the emission standards for Yanmar diesel engines?

Yanmar’s small and medium-sized generator sets have mature emission technology, generally meeting EPA Tier 3 and EPA Tier 4 emission standards. Yanmar engines use multi-stage fuel injection technology, which not only improves combustion efficiency but also reduces emissions and fuel consumption. Yanmar’s exhaust gas treatment system is advanced, including an exhaust gas recirculation system, diesel catalytic converter, particulate filter, and catalytic reduction system, keeping its emission control at the forefront of the industry.

How to maintain a Yanmar diesel engine?

1. Regularly check the engine oil and coolant levels, as well as the fuel system, for leaks, etc.
2. Change the engine oil, oil filter, and fuel filter approximately every 300 hours, and clean the air filter.
3. Check the fuel injection and cooling systems approximately every 500 hours, and inspect belts, etc.
4. Replace the air filter approximately every 1000 hours and check valve clearances.
5. Change the coolant approximately every 3000 hours and check the water pump and cylinder pressure, etc.

What is the maximum power of a Yanmar engine?

Yanmar engines are used in small industrial engine sets, construction machinery, marine applications, and automotive air conditioning systems. Their most advantageous power range is typically 5kW-75kW. Compared to other brands, Yanmar engines are technologically advanced within this power range. Yanmar engines feature a reasonable and compact parts arrangement, resulting in a smaller size, lower vibration, and lower noise compared to diesel engines with similar power outputs. Market-proven fuel consumption is also lower than the industry average, making them suitable for long-term operation.

What are the advantages of Yanmar engines compared to other brands (such as Cummins and Perkins)?

Yanmar has long focused on small and medium-power diesel engine technology. Within the 100kW range, their fuel economy and overall structure are superior to Cummins and Perkins, and their operating noise is also lower. Yanmar engines are manufactured with high precision, resulting in a higher price for the same power output compared to Cummins and Perkins. Cummins is more geared towards heavy-duty industrial applications, with advantages in high power output and heavy-load capacity. Perkins, on the other hand, offers more balanced power output, with lower fuel consumption and noise than Cummins but higher than Yanmar.

Are Yanmar engines suitable for high-temperature/high-altitude environments?

With proper configuration and selection, Yanmar engines can adapt to any harsh environment. Equipped with a highly efficient cooling system, a specially designed fan, and a unique fuel injection system, Yanmar engines are frequently used in the interiors of buses, yachts, and other vehicles with poor ventilation. However, they can still maintain a constant operating temperature, demonstrating their exceptional heat dissipation capabilities. Yanmar engines’ electronic fuel injection system and unique mechanism allow them to easily handle high-altitude operating environments.

What is the noise level of a Yanmar diesel engine?

Typically, an Open Type Yanmar generator produces 80-85 dB(A) noise at 7 meters, while a Soundproof/Silent Yanmar generator produces 65-75 dB(A). With a super-silent enclosure, the noise level is 50-65 dB(A). At 1500/1800 rpm, the noise level is normal. However, if it needs to be used as a power source for other purposes besides electricity, the noise will increase significantly at speeds typically 2000-3000 rpm.

What is the service life of a Yanmar engine?

1. For Yanmar industrial generator sets, as primary power, it can typically operate for 30,000-40,000 hours. As backup power, its service life can reach 20-25 years.
2. For Yanmar marine generator sets, where load variations are typically small and operation is stable, it can typically operate for around 40,000 hours.
3. Used in Yanmar vehicle-mounted generator sets or yachts, Yanmar engines, in addition to providing electricity, also need to power the compressor and propeller. Installation space is limited and ventilation is poor, resulting in a typical lifespan of around 20,000 hours.
4. Used as a power source for construction machinery (such as excavators), due to frequent start-stop cycles and large operational fluctuations, the typical lifespan is 10,000-20,000 hours.

How to diagnose common faults in Yanmar diesel engines?

1. Unable to start or difficult to start: Check battery voltage and wiring, check for oil leaks, check for proper air intake, and check if the starter motor is working properly.
2. Insufficient power: Check for a clogged air filter, check the fuel injection system, and observe the exhaust smoke color.
3. Engine overheating: Check if the coolant needs changing, check if the water pump is working properly, check if the fan is working properly, and check the thermostat.
4. Abnormal vibration: Check for loose screws, check the coupling installation, check piston ignition, and check for damaged bearings.

What load can a Yanmar diesel generator set operate under?

The most economical operating load for a Yanmar generator is 70%-80%. Under this condition, fuel efficiency is highest, wear and tear on the generator set is minimal, and operation is most stable. Because of Yanmar’s stringent manufacturing standards, it can also operate at 80%-100% load for extended periods, but maintenance intervals should be shortened. Operating below 30% load for extended periods is not recommended, as it can lead to engine carbon buildup, increased fuel consumption, and ultimately shorten the generator set’s lifespan.

What is the fuel consumption of a Yanmar generator set?

The average fuel consumption rate of a Yanmar generator set is approximately 200-230 g/kWh. Compared to similar generator sets, its efficiency is excellent. Fuel efficiency is typically highest at 70%-80% load. Loads that are too low or too high will result in decreased fuel efficiency and increased fuel consumption.
ELECPRIME Yanmar generator sets use high-precision original Yanmar engines, ensuring accurate fuel injection, high combustion efficiency, and economic durability. ELECPRIME focuses on Yanmar small and medium-sized generator sets, making it the best partner for your electricity needs.

What industries and applications are Yanmar generator sets suitable for?

Yanmar generator sets are widely used in temporary power supply for construction projects, main/backup power for commercial and industrial applications, auxiliary power generation for yachts and ships, air conditioning systems in buses and daily power supply for RVs, power sources for agricultural machinery and irrigation systems, and power sources for remote areas, due to their small size, portability, quick start-up, and strong power. Yanmar generator sets have received widespread recognition and praise in various application areas.

How do Yanmar generator sets perform when operating under low or high voltage?

Yanmar generator sets typically experience voltage fluctuations of around 5%, and short-term fluctuations of up to 10% are acceptable. However, prolonged operation under either low or high voltage conditions is not recommended. Prolonged low-voltage operation can lead to increased load current, higher load equipment temperature, motor overheating, poor insulation, increased susceptibility to short circuits, and a shortened generator lifespan. Prolonged high-voltage operation can damage the motor’s insulation windings and burn out the load equipment and the motor. ELECPRIME Yanmar generator sets are equipped with a high-precision voltage regulation system to ensure stable voltage during operation.

How to choose a Yanmar generator set that suits your needs (domestic or industrial)?

1. Determine the characteristics of your load: stable or inductive.
2. Calculate the maximum power required for the total load.
3. Reserve an additional 20%-30% power capacity to avoid overload.
4. Determine the operating time and the intended use of the Yanmar generator set (primary or standby).
5. Considering the operating environment of the Yanmar generator set, 50% of the power capacity should be reserved for harsh environments.
6. Calculate fuel consumption and equip with a fuel tank of corresponding capacity.

What voltage levels and frequencies does the Yanmar generator set support?

The ELECPRIME Yanmar generator set 50Hz supports 220V/single-phase, 230V/single-phase, 380V/three-phase, 400V/three-phase, and 415V/three-phase voltages and frequencies, typically suitable for Southeast Asia, the Middle East, Europe, Africa, and parts of Oceania. It supports 60Hz, 120V/single-phase, 240V/single-phase, 208V/three-phase, and 480V/three-phase voltages and frequencies, typically suitable for the United States, Canada, and parts of South America.

Can Yanmar generator sets be customized in terms of appearance or rated power?

ELECPRIME supports any form of customization, including appearance, power configuration, rated voltage, and frequency. You can configure your Yanmar generator with a soundproof enclosure, rain shelter, mobile trailer, etc. You can also configure the exterior with steel structure, aluminum alloy, or stainless steel rain cover, or apply anti-corrosion materials for humid environments. Because Yanmar generator sets have a wide power range, you can configure different power levels to suit your specific load requirements.

Do Yanmar generator sets come with an automatic start control system?

All ELECPRIME Yanmar generators are equipped with an automatic control system, enabling automatic start, automatic stop, remote start, fault protection, manual/automatic mode switching, voltage, frequency, and current monitoring, oil pressure monitoring, high water temperature protection, fault alarms, and other functions. They also feature an ATS (Automatic Start System) and intelligent digital control module, commonly used for precise power supply or critical load power supply.