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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: First make sure there is NOT a load on the machine. Set the IDLER switch to the HIGH position. The solenoid should activate. Using the 7/16” wrench, adjust the high speed solenoid linkage to lengthen the linkage until the engine speed starts to decrease. See Figure F.7. Adjust the linkage in the opposite direction until the engine speed is within limits (3650 - 3700 RPM). Tighten the locking nut. The high speed set screw is preset and sealed by the engine manufacturer and normally should not be adjusted.

Adjust LOW IDLE: First make sure there is NOT a load on the machine. Set the IDLER switch to AUTO and wait for the engine to change to low idle speed. Use the 10mm wrench to loosen the lock nut on the low speed set screw. See Figure F.8. Adjust the set screw until the engine speed is between 2150 and 2220 RPM. Tighten the lock nut.

Frequency Counter Method

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

2.Start the engine and check the frequency counter. At HIGH IDLE (3700 RPM), the counter should read 63 Hz. At LOW IDLE (2220 RPM), the counter should read 37 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: First make sure there is NOT a load on the machine. Set the IDLER switch to the HIGH position. The solenoid should activate. Using the 7/16” wrench, adjust the high speed solenoid linkage to lengthen the linkage until the engine speed starts to decrease. See Figure F.7. Adjust the linkage in the opposite direction until the frequency is 63 Hz. Tighten the locking nut. The high speed set screw is preset and sealed by the engine manufacturer and nor- mally should not be adjusted.

Adjust LOW IDLE: First make sure there is NOT a load on the machine. Set the IDLER switch to AUTO and wait for the engine to change to low idle speed. Use the 10mm wrench to loosen the lock nut on the low speed set screw. See Figure F.8. Adjust the set screw until the frequency is 37 Hz. Tighten the lock nut.

Oscilloscope Method

1.Connect the oscilloscope to the 115 VAC receptacle, according to the manufacturer’s instructions. At HIGH IDLE (3700 RPM), the waveform should exhibit a period of 15.8 milliseconds. At LOW IDLE (2220 RPM), the waveform should exhibit a period of 27.02 milliseconds. Refer to the NORMAL OPEN

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

2.If either of these waveform periods is incor- rect, adjust the throttle as follows:

Adjust HIGH IDLE: First make sure there is NOT a load on the machine. Set the IDLER switch to the HIGH position. The solenoid should activate. Using the 7/16” wrench, adjust the high speed solenoid linkage to lengthen the linkage until the engine speed starts to decrease. See Figure F.7. Adjust the linkage in the opposite direction until the period is 15.8 milliseconds. Tighten the locking nut. The high speed set screw is preset and sealed by the engine manufac- turer and normally should not be adjusted.

Adjust LOW IDLE: First make sure there is NOT a load on the machine. Set the IDLER switch to AUTO and wait for the engine to change to low idle speed. Use the 10mm wrench to loosen the lock nut on the low speed set screw. See Figure F.8. Adjust the set screw until the period is 27.02 mil- liseconds. Tighten the lock nut.

RANGER 300 D AND 300 DLX

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Lincoln Electric SVM148-B service manual Frequency Counter Method, Oscilloscope Method
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SVM148-B specifications

The Lincoln Electric SVM148-B is a state-of-the-art inverter-based power source designed for both professional welders and hobbyists. As a versatile machine, it excels in a variety of welding applications including MIG, TIG, and stick welding. This machine is particularly notable for its efficiency and portability, making it an ideal choice for on-site projects or workshops where space is limited.

One of the main features of the SVM148-B is its inverter technology. Unlike traditional transformer-based welders, inverter welders are typically lighter and more compact. This means that users can transport the machine more easily without sacrificing power or performance. The SVM148-B is capable of delivering a substantial amperage range, allowing for adjustments that suit various materials and thicknesses, from thin sheet metal to thicker plates.

The machine offers adjustable output levels, providing precise control over the welding process. This level of control is essential for achieving clean, strong welds and is especially useful when working with different materials. The SVM148-B is equipped with digital display features that provide real-time feedback on power settings and welding parameters, allowing welders to make quick adjustments as needed.

Another significant advantage of the SVM148-B is its duty cycle, which is designed to accommodate extended usage without overheating. A robust duty cycle means that professionals can rely on this machine for prolonged periods, making it a dependable choice for heavy-duty tasks.

The SVM148-B also includes advanced safety features such as overload protection, which ensures that the machine will shut down in the event of excessive current draw. This feature not only protects the equipment but also enhances user safety during operation.

Moreover, the machine is compatible with a wide variety of welding wires and electrodes, adding to its versatility. Whether you're working with stainless steel, aluminum, or mild steel, the SVM148-B can adapt seamlessly.

In conclusion, the Lincoln Electric SVM148-B combines advanced inverter technology with user-friendly features, making it an invaluable addition to any welding setup. Its portability, control options, robust duty cycle, and safety measures set it apart as a reliable and efficient welding solution for professionals and hobbyists alike. Whether for a small workshop or large industrial applications, the SVM148-B meets the demands of modern welding with efficiency and ease.
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