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F-57

TROUBLESHOOTING AND REPAIR

F-57

ROCKER ADJUSTMENT PROCEDURE (continued)

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PROCEDURE (continued)

Initial rocker placement:

1.The rocker should be initially positioned so the center of brushes visually lines up with the center of the main poles. Lining up the four brush holder studs with the four exciter brack- et mounting bolts is acceptable for initial place- ment. The rocker should be tight against the shoulder of the hub and the clamping screw should be tightened only enough to assure the rocker cannot move.

IMPORTANT: DO NOT OVER TIGHTEN. Over tightening the rocker clamp screw can destroy the rocker.

2.Check that the brush holders are properly installed and positioned correctly. See the

Welding generator Brush and Commutator Inspection and Service Procedure.

3.Start the engine, place the idle switch in the high idle position, and seat the brushes using a commutator stone. See the Welding gener- ator Brush and Commutator Inspection and Service Procedure.

4.Use a load bank to apply a 100% duty cycle load (400 amps @ 36 volts). Look at the brushes while the load is applied. If excessive sparking is observed, adjust the rocker position to minimize sparking. Generally, moving the rocker slightly in the direction of the armature rotation will reduce sparking.

5.Continue running the machine under load for at least 30 minutes to bring the machine up to normal operating temperature and to fully seat the brushes.

Check for Max output.

6.Remove the load, set the output control and rheostat to maximum, re-apply the load and adjust the load bank to apply a 500 Amp load to the machine.

WARNING: Do not move the Current Control while the machine is under load.

7.Measure the output voltage, it should read between 45 and 51 Volts DC

8.Measure the engine RPM, it should measure between 1680 and 1795 RPM.

If the engine RPM is not within specification, Perform the Engine RPM Adjustment Test, if the engine high idle RPM is normal, but the load RPM is significantly less than specified above, the engine or governor may be malfunctioning. See the engine troubleshooting procedures in this man- ual and/or have the engine serviced or repaired by a qualified engine technician.

If the weld output voltage is lower than specified above, the rocker position will need to be adjusted. Generally, moving the rocker opposite the arma- ture rotation direction will increase output voltage. When making this adjustment, the rocker should only be moved in very small increments. The adjustment may need to be repeated several times to achieve the desired result.

9.Remove the load and check the voltage at the output studs (OCV). The voltage should mea- sure 93 to 99 Volts DC.

After the rocker has been adjusted and the machine is operating normally, the rocker locking screw should be tightened to 70-75 Inch-Lbs.

If new parts had been installed, the new rocker and/or exciter bracket location should be marked with a 1/8” drill mark. See Figure F.18.

SAE-400 SEVERE DUTY

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Lincoln Electric SVM187-A service manual Rocker Adjustment Procedure, Initial rocker placement, Check for Max output
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SVM187-A specifications

The Lincoln Electric SVM187-A is a cutting-edge welding machine designed for professional welders and industrial applications. Known for its reliability and performance, it stands out in the competitive welding equipment market. This versatile machine is structured to handle various welding processes, making it a popular choice among users.

One of the primary features of the SVM187-A is its multifunctional capabilities. It supports MIG, TIG, and Stick welding, allowing users to switch between different welding techniques seamlessly. This flexibility makes it suitable for diverse applications, whether working on automotive repairs, metal fabrication, or construction projects. Additionally, the machine is equipped with a robust power output, ranging from low to high amperage settings, enabling users to tackle a wide array of materials, including mild steel, stainless steel, and aluminum.

The SVM187-A incorporates advanced inverter technology, which ensures increased efficiency and reduced energy consumption. This technology leads to a more compact design, making the unit portable and easy to transport. The lightweight construction of the machine does not compromise its durability; it is built with high-quality materials to withstand the rigors of a professional workshop.

Another notable characteristic of the SVM187-A is its user-friendly interface. The intuitive control panel includes digital displays for precise settings adjustments, ensuring accuracy during operation. Beginners and seasoned welders alike can benefit from the clear and straightforward design, reducing training time and enhancing productivity.

Safety features are paramount in the SVM187-A's design. The machine is equipped with thermal overload protection, ensuring that it operates within a safe temperature range to prevent damage and promote longevity. Additionally, it features automatic voltage regulation, which maintains a stable arc even under varying input voltage conditions.

In summary, the Lincoln Electric SVM187-A is a versatile, efficient, and user-friendly welding machine suited for both professional and industrial applications. Its multifunctionality, inverter technology, and robust safety features set it apart from competitors, making it a reliable choice for welders seeking to elevate their craftsmanship while ensuring safety and efficiency. This machine represents the innovation and quality that Lincoln Electric is renowned for in the welding industry.
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