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D-2 MAINTENANCE
LN-7 GMA WIRE FEEDER
ROUTINE MAINTENANCE
DRIVE ROLLS AND GUIDE TUBES
After feeding every coil of wire, inspect the
drive roll section. Clean the assembly as
necessary. Do not use solvent to clean the
drive roll assembly as it may wash the
lubricant out of the bearings. The drive rolls
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 must be changed.
The drive rolls for 0.045 and 0.052 cored
electrode and 1/16, 0.068, 5/64, 3/32, and
7/64 electrode have a double set of teeth so
they can be reversed for additional life.
Between the two knurled rolls (except 1/16
and smaller rolls) is a shim washer which
limits the damage to the electrode if wire
feeding problems occur. Drive rolls for 0.023
through 0.052 solid electrodes have no
teeth.
Refer to the instructions included with the
drive roll kit for installation and replacement
of the drive rolls on the wire feeder.
WIRE REEL MOUNTING
To prolong the life of the reel shaft on the 50
to 60 lb coils, periodically coat it with a thin
layer of grease. No maintenance to the two
position brake is required. If the brake shoe
wears through to metal, replace the brake
assembly.
No routine maintenance is required for
Readi-Reels and 10 to 30 lb spools. Do not
lubricate the 2 in. spindles.
PERIODIC MAINTENANCE
WIRE DRIVE MOTOR AND
GEARBOX
Every year inspect the gearbox and coat the
gear teeth with a moly-disulfide filled grease.
Do not use graphite grease.
Every six months check the motor brushes.
Replace them if they are less than 1/4 in.
long.
GUN AND CABLE MAINTENANCE
For instructions on periodic maintenance for
the welding gun and cables, refer to the
manual for your specific model of welding
gun.
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