Lincoln Electric NA-5SF, NA-5NF service manual Optional Features

D-6 MAINTENANCE D-6

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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.

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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