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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 10mm wrench to loosen the locking nut. See Figure F.8 for location of the adjusting screw and locking nut. Turn the threaded screw counter-clock- wise 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 collar, 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 10mm wrench to loosen the locking nut. See Figure F.8 for location of the adjusting screw and lock- ing nut. Turn the threaded screw counter- clockwise to increase the HIGH IDLE speed. Adjust the speed until the frequency 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 col- lar, 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 10mm wrench to loosen the locking nut. See Figure F.8 for location of the adjusting screw and lock- ing nut. Turn the threaded screw counter- clockwise to increase the HIGH IDLE speed. Adjust the speed until the period is 16.6 mil- liseconds. 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 col- lar, to change the amount of throw in the lever arm, until the period is 21.4 millisec- onds. Retighten the locking nut.

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CLASSIC II

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Lincoln Electric SVM125-A service manual Frequency Counter Method, Oscilloscope Method

SVM125-A specifications

The Lincoln Electric SVM125-A is a versatile and highly efficient welding machine that has gained significant recognition in the welding industry. Designed for both professionals and enthusiasts, this machine combines advanced technology with user-friendly features to deliver outstanding performance in a range of welding applications.

One of the standout features of the SVM125-A is its Inverter Technology. This cutting-edge technology allows for lightweight and compact design, making the machine highly portable. The inverter technology also provides a steady arc, which is crucial for achieving clean, high-quality welds. With a duty cycle of 125 amps at a 60% duty cycle, this welding machine can handle a variety of materials and thicknesses, from thin sheet metal to heavier structural components.

The SVM125-A supports multiple welding processes, including MIG, stick, and TIG welding. This versatility makes it an ideal choice for diverse welding tasks, whether you're working in a fabrication shop, doing repair work, or engaged in hobbyist projects. The machine features easy switch functionality, allowing users to quickly shift between welding processes without complicated setup.

Another notable characteristic is the machine's user-friendly interface. The intuitive control panel includes clear indicators and knobs that allow for easy adjustments of voltage and wire feed speed. This design is especially helpful for novice welders, providing them with the confidence to make adjustments as needed and ensuring optimal weld quality.

Safety is also a priority with the SVM125-A. The machine is equipped with thermal overload protection, which automatically shuts it down in case of overheating, preventing damage to the unit and ensuring operator safety. Additionally, the machine features a robust construction that emphasizes durability, making it suitable for demanding work environments.

Portability is enhanced through its lightweight design, and the built-in carrying handle makes it easy to transport from one job site to another. The SVM125-A is also compatible with a variety of welding accessories, further increasing its adaptability and functionality.

In conclusion, the Lincoln Electric SVM125-A stands out as a well-rounded welding machine that integrates advanced technology with user-friendly features. Its versatility in welding processes, robust design, and emphasis on safety and usability make it a valuable tool for welders at all skill levels. Whether for professional use or personal projects, the SVM125-A is a reliable choice that delivers exceptional performance and quality.