Lincoln Electric NA-5S - Manual (Page 47)

MAINTENANCE D-6 D-6
NA-5
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.
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.
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.
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.
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