D-6

MAINTENANCE

D-6

Return to Section TOC

Return to Section TOC

to Section TOC

Return to Master TOC

Return to Master TOC

to Master TOC

OPTIONAL FEATURES

CONTACT ASSEMBLIES

A dirty or rusty electrode and excessively high currents cause rapid wear of the contact tips. The nozzle contact tip must be replaced when it no longer provides accurate wire location or good electrical contact. See Sec. T2.2.6, Sec. T2.2.7, or Sec. T2.5.3 of the IM305 manual for specific instructions to replace contact tips and to perform maintenance on other various contact assemblies.

WIRE REEL MOUNTING FOR 50 OR 60 LB (22.7 OR 27.2 KG) COILS

Periodically coat the reel shaft with a thin layer of grease. No maintenance of the two- position adjustable brake is needed except to replace the shoe assembly if it wears through.

TRAVEL CARRIAGE

Periodically:

1.Disengage the release handle and see that the carriage moves freely along the beam.

2.Add a few drops of machine oil to each of the head lift bearings. This can be done through the front opening in the carriage.

2.Check the carriage drive gear teeth. If the teeth are badly worn, replace the drive gear.

3.After 5,000 hours of operation, the motor and the first reduction gear should be removed from the gear box, and all the gear teeth should be recoated with a good grade of graphite grease.

VERTICAL LIFT ADJUSTER

Every month, add a few drops of SAE-140 oil or equivalent to the oil cup on the back of the vertical lift housing. Every year, replace the grease in the top section gear cavity with a medium grease. If the unit is disassembled for cleaning, apply a layer of medium grease to the screw threads of the head lift tube and head lift screw. Apply a thin layer of grease to the outside diameter of the head lift tube and the inside diameter of the long hole in the head lift body. Slide the head lift tube into the head lift body and screw in the head lift screw. Fill the upper section gear cavity one-half full of grease. Be sure the needle bearings are packed in grease.

HORIZONTAL ADJUSTER

Twice a year, apply a thin coat of grease to all sliding surfaces. Every year, replace the grease in the gear cavity with a medium grease.

3.Add a few drops of oil to the clutch handle bearings.

4.Add a few drops of oil into each of the cups at the travel mounting pivot point.

(No change of lubrication is required for cold temperature operation.)

Once a year:

1.Check the motor brushes. If 0.25 in. (6.35 mm) or shorter, replace with new brushes.

HIGH FREQUENCY GENERATOR

Inspect the spark gaps monthly and maintain the setting specified on the spark gap cover plate.

SPREADARC

Refer to the maintenance information provided in IM305 Sec. T2.5.6.

NA-5

Page 46 Page 48
Page 47
Image 47
Lincoln Electric NA-5SF, NA-5NF service manual Optional Features
Page 46 Page 48

NA-5S, NA-5N, NA-5SF, NA-5NF specifications

The Lincoln Electric NA-5NF, NA-5SF, NA-5N, and NA-5S are advanced welding helmets that are pivotal in enhancing the safety and efficiency of welders in various applications. These models are designed to provide exceptional protection and visibility, making them indispensable tools in the welding industry.

One of the main features of the NA-5 series is the auto-darkening filter technology. This feature allows the helmet to automatically adjust its shade based on the intensity of the arc. As the welder strikes an arc, the lens darkens instantaneously, shielding the eyes from harmful rays generated during the welding process. This functionality not only ensures safety but also enhances productivity, as welders do not need to manually flip the helmet up and down.

The helmets are equipped with a wide viewing area that allows for better visibility and precision while working. With a large lens, welders can easily monitor their work and surrounding environment, minimizing the risk of accidents. Additionally, the lightweight design of the NA-5NF, NA-5SF, NA-5N, and NA-5S provides comfort during extended periods of use, reducing neck strain and fatigue.

The NA-5 series is also well-regarded for its durability. Constructed from impact-resistant materials, these helmets can withstand the rigors of demanding work environments. This durability extends the lifespan of the helmet, making it a cost-effective investment for both professional and hobbyist welders.

Another notable characteristic is the adjustable sensitivity and delay settings found in certain models. These settings allow the user to customize the helmet based on their specific welding conditions. For instance, a welder can increase sensitivity for low-amperage tasks or adjust the delay to allow for a smoother transition from dark to light after completing a weld.

Furthermore, the helmets come with a reliable battery life, ensuring that they can be used for long periods without interruption. Some models also feature solar assist functionality, which helps recharge the auto-darkening filter, enhancing their overall efficiency.

In summary, the Lincoln Electric NA-5NF, NA-5SF, NA-5N, and NA-5S welding helmets represent a significant advancement in personal protective equipment for welders. Their combination of auto-darkening technology, wide viewing area, lightweight design, durability, and customizable settings makes them an excellent choice for anyone engaged in welding tasks. With these helmets, users can achieve greater safety and efficiency in their work, enabling them to focus on their craft with peace of mind.
Top Page Image Contents