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MAINTENANCE
To ensure proper smoke pickup and gun life, the
intake ports and end of extension guide must be kept
Maintenance
Recommended
Clean intake ports and
I.D. of extension guide
with wire. Remove spat-
ter from bottom of exten-
sion guide.
With vacuum off, remove
extension guide and clean
I.D. of housing and clean
nozzle spacer.
Break loose any particles
built up at bend or clamp
in intake housing with a
piece of wire or electrode
Gun Cables
Clean cables after using approximately 300 pounds of
electrode. Remove the cable from the wire feeder and
lay it out straight on the floor. Remove the contact
nozzle tip from the gun. Using an air hose and only
partial pressure, gently blow out the cable from the
gun end. Too much pressure at the start will cause
the dirt to form a plug.
Flex the cable over its entire length and again blow
out the cable. Repeat this procedure until no further
dirt comes out.
Gun Nozzle
a. Replace worn contact tips as required.
b. Remove spatter from tip or extension guide after
each ten minutes of arc time as required.
c. Replace worn spring liner in nozzle. The life of the
liner can be doubled by rotating the liner 180°.
Trouble
Poor smoke pickup
Poor arc action or erratic feeding.
free of spatter. A piece of wire is recommended to
keep intake ports and I.D. of extension guide free of
spatter and smoke buildup.
The following cleaning schedule is recommended:
NS-3M &
NR-311
Electrodes
Do not let spatter accumulate on end of extension guide. Clean as necessary.
Failure to keep extension guide free of spatter will make extension guide electrically
hot and it will arc to work.
When intake ports are 50% plugged.
Each 1/2 coil
of electrode
of electrode
10 to 20 coils
10 to 20 coils
of electrode
of electrode
d. Internal parts of nozzle can be removed and
The ceramic insert and retainer will normally fall out
the end of the nozzle but if they do not, gently drive
the spring liner towards the outgoing end of the noz-
zle.
See the parts list pages for construction details and
replacement parts. When re-assembling the nozzle,
make certain that the ceramic nozzle insert is placed
next to the spring liner. The hollow-lock set screw is
to be tightened to give .38" as measured from the end
of the nozzle to the hollow-lock set screw.
TROUBLESHOOTING
Cause
Vacuum unit not operating correctly.
Spatter buildup on intake ports, I.D. of
extension guide or I.D. of intake housing.
Hoses blocked or damaged.
Strong drafts.
Visible stickout is too long.
Housing "O" ring seal not in place.
Worn contact tip or nozzle.
Dirty cable.
FLUX CORED FUME GUN
5/64 NR-211MP With
Other
S16989
Extension Guide
Each coil
--
2 to 5 coils
of electrode
The liner can be pulled out the back end of the
nozzle by wedging the blade of a small screwdriv-
er in the I.D. and pulling.
replaced by removing the internal hollow-lock set
screw from the contact tip end of the nozzle with
an Allen wrench.
Remedy
Clean filters or repair vacuum unit.
Remove spatter and clear all passages.
Clean or repair hoses.
Eliminate strong drafts or construct barriers
so draft will not affect smoke removal.
Shorten visible stickout to
recommended length.
Place "O" ring against housing to handle junction.
Replace worn parts.
Blow out cable with compressed air.
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