Lincoln LN-7 - Manual (Page 15)

The Lincoln Electric Company
Cleveland, Ohio 44117 Maintenance Instructions
SEC. J6.1 WIRE FEEDER MAINTENANCE
WARNING: Have a qualified electrician do the maintenance and trouble shooting work.
Turn the input power off at the power source before working inside the wire feeder.
Sec. J6.1.1
Wire Drive Motor and Gear Box
Every year inspect the gear box and paint the gear teeth
with graphite grease.
Every six months check the motor bmshes. Replace
them if they are less than 1 /4” long.
September 1971
Sec. J6.I.2
Drive Rolls and Guide Tubes
Periodically inspect the drive roll section. Clean it as
necessary. Do not use solvents for cleaning the idle roll
because it may wash the lubricant out of the bearing. The
drive roll, idle roll and guide tubes are stamped with the
wire sizes they will feed. If a wire size other than that
stamped on the rolls is to be used, the rolls and guide tubes
should be changed.
The drive roll for 1/16, .068, 5/64, 3/32 and 7/64” elec­
trode have a double set of teeth so they can be reversed for
additional life. Between the two knurled rolls (except
1/16” rolls) is a shim washer which limits the damage to the
electrode if wire feeding problems occur. See Sec. J2.2.2
for roll changing instructions.
Drive rolls for .045 and .035 electrodes have no teeth.
They are not reversible.
September 1971
Sec. J6.1.3
Wire Reel Mounting — 50 and 60 Pound Coils
To prolong the life of the reel shaft, periodically coat it
with a thin layer of grease.
No maintenance of the two position adjustable brake
installed on machines built after November 1972 is needed
except to replace the shoe assembly if it wears through.
November 1972
Sec. J6.1.5
Control Box
The control box requires no routine maintenance.
September 1971
SEC J6.2 GUN AND CABLE MAINTENANCE
Sec. J6.2.1
Gun Cable
A dirty gun cable can cause rough and erratic wire feed­
ing. Therefore, the cable liner must be cleaned periodically.
Remove the cable from the wire feeder. 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. Work the full length of the cable by
bending it back and forth then blow it out again. Continue
this procedure until cable is clean.
October 1981
Sec. J6.2.2
Gun Disassembly: K-115 and K-126 Innershield
Squirtguns
To remove the nozzle from the gun, loosen the 3/16”
Allen head screw in the gun handle and pull the nozzle
straight out. To reinstall, insert the nozzle into the gun
handle. Push it in as far as possible and tighten the Allen
head screw.
To disassemble Innershield Squirtguns K-115 and K-126,
first loosen the screws which hold the heat shield in place.
Remove the heat shield.
To disassemble the switch housing from all these guns,
remove the four screws holding the saddle around the gun
handle. Then hold the housing with the cable toward the
floor and look into the switch cavity. The tight side of the
larger roll pins is to the right. Drive these pins to the left.
They can be easily removed when they clear the right side
of the casting. Do not remove the smaller roll pins unless
the trigger is being replaced. The height of the Z spring
controls the operating point of the switch with respect to
the trigger movement. Set the spring so the switch operates
at about the mid-point of the trigger travel.
To remove the handle from the cable, slip the spatter
shield out of the front of the handle. Remove the 1/4-20
socket head screw through the hole in the side of the
handle. Then pull the handle back on the cable. Remove
the snap ring and connector clamp and the handle can then
be shpped off the cable.
September 1971
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