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TROUBLESHOOTING & REPAIR

ENGINE THROTTLE ADJUSTMENT TEST (continued)

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6.If either of the readings is incorrect, adjust the throttle as follows:

Adjust HIGH IDLE: Use the 8mm wrench to loosen the locking nut. See Figure F.8 for location of the adjusting screw and locking nut. Avoid breaking the seal. There should be enough play to allow adjustment without disturbing the seal. Turn the threaded screw counter-clockwise to increase the HIGH IDLE speed. Adjust the speed until the tach reads between 1780 and 1810 RPM. Retighten the locking nut.

Adjust LOW IDLE: First make sure there is no load on the machine. Set the IDLE switch to AUTO and wait for the engine to change to low idle speed.

Use the 7/16" wrench to loosen the solenoid lever arm locking nut. See Figure F.9. Adjust the threaded solenoid lever arm shaft, to change the amount of throw in the lever arm, until the tach reads between 1350 and 1400 RPM. Retighten the locking nut.

Frequency Counter Method

1.Plug the frequency counter into one of the 115 VAC auxiliary receptacles.

2.Start the engine and check the frequency counter. At HIGH IDLE (1800 RPM), the counter should read 60 Hz. At LOW IDLE (1400 RPM), the counter should read 47 Hz. Note that these are median measurements; hertz readings may vary slightly above or below.

3.If either of the readings is incorrect, adjust the throttle as follows:

Adjust HIGH IDLE: Use the 8mm wrench to loosen the locking nut. See Figure F.8 for location of the adjusting screw and locking nut. Avoid breaking the seal. There should be enough play to allow adjustment without disturbing the seal. Turn the threaded screw counter-clockwise to increase the HIGH IDLE speed. Adjust the speed until the fre- quency reads 60 Hz. Retighten the locking nut.

Adjust LOW IDLE: First make sure there is no load on the machine. Set the IDLE switch to AUTO and wait for the engine to change to low idle speed. Use the 7/16" wrench to loosen the solenoid lever arm locking nut. See Figure F.9. Adjust the threaded solenoid lever arm shaft, to change the amount of throw in the lever arm, until the frequency reads 47 Hz. Retighten the locking nut.

Oscilloscope Method

1.Connect the oscilloscope to the 115 VAC receptacle, according to the manufacturer’s instructions. At HIGH IDLE (1800 RPM), the waveform should exhibit a period of 16.6 milliseconds. At LOW IDLE (1400 RPM), the waveform should exhibit a period of 21.4 milliseconds. Refer to the NORMAL OPEN

CIRCUIT VOLTAGE WAVEFORM (115 VAC SUPPLY) HIGH IDLE - NO LOAD in this section of the manual.

2.If either of these periods is incorrect, adjust the throttle as follows:

Adjust HIGH IDLE: Use the 8mm wrench to loosen the locking nut. See Figure F.8 for location of the adjusting screw and locking nut. Avoid breaking the seal. There should be enough play to allow adjustment without disturbing the seal. Turn the threaded screw counter-clockwise to increase the HIGH IDLE speed. Adjust the speed until the peri- od is 16.6 milliseconds. Retighten the lock- ing nut.

Adjust LOW IDLE: First make sure there is no load on the machine. Set the IDLE switch to AUTO and wait for the engine to change to low idle speed. Use the 7/16" wrench to loosen the solenoid lever arm locking nut. See Figure F.9. Adjust the threaded solenoid lever arm shaft, to change the amount of throw in the lever arm, until the period is 21.4 milliseconds. Retighten the locking nut.

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Lincoln Electric SVM128-A service manual Frequency Counter Method, Oscilloscope Method
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SVM128-A specifications

The Lincoln Electric SVM128-A is a cutting-edge welding machine designed to meet the demands of both professional welders and DIY enthusiasts. This versatile welding power source brings together advanced technology and robust design, making it a reliable choice for various welding applications.

One of the standout features of the SVM128-A is its capability to perform multiple welding processes. It supports MIG, TIG, and stick welding, allowing users to tackle a wide range of projects with ease. This multi-functionality makes it ideal for professionals working in different industries, as well as for hobbyists who enjoy diverse welding tasks.

The SVM128-A is equipped with inverter technology, which enhances its performance by providing a more stable arc and improved energy efficiency. This technological advancement contributes to lower operational costs and allows for a more consistent weld quality across different materials and thicknesses. Additionally, the inverter technology enables the machine to be lightweight and portable, making it convenient for jobs that require mobility.

Another prominent characteristic of the SVM128-A is its user-friendly interface. The machine features intuitive controls and a digital display that allows operators to easily set the desired welding parameters. This simplified setup helps reduce the learning curve for new users while also offering precise control for experienced professionals.

The Lincoln Electric SVM128-A is designed with durability in mind. Its robust construction ensures that it can withstand the rigors of frequent use in demanding environments. The machine is also equipped with various safety features, including thermal overload protection and a duty cycle rating that prevents overheating, ultimately extending its lifespan.

For optimal performance, the SVM128-A provides adjustable output options, allowing users to customize the welding parameters based on their specific needs. This flexibility makes it suitable for welding various metals, including steel, aluminum, and stainless steel.

In summary, the Lincoln Electric SVM128-A combines versatility, advanced technology, and a user-friendly design. With its capability to perform multiple welding processes, lightweight construction, and durable features, it stands out as an excellent option for anyone looking to achieve high-quality welds. Whether for professional or personal use, the SVM128-A is poised to deliver reliable performance and exceptional results.
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