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D-1
MAINTENANCE
D-1
LN-742 & LN-742H
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. Drive rolls for 0.023 through 0.052 solid
electrodes have no teeth.
Refer to the instructions in Section B, Operation for
installation of drive rolls.
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 instructions
included with your specific model of welding gun.