Lincoln-electric LN-25 SVM114-C User Manual download pdf (Page 30)

MAINTENANCE

D-2D-2

LN-25™

ELECTRIC SHOCK can kill.

• Do not operate with covers

removed.

• Turn off power source before

installing or servicing.

• Do not touch electrically hot

parts.

• Turn the input power to the

welding power source off at

the fuse box before working in

the terminal strip.

• Only qualified personnel

should install, use or service

this equipment.

CIRCUIT PROTECTION AND

AUTOMATIC SHUTDOWN

CONTROL PC BOARD FUSE

On G1757-6 (or higher part no.) PC boards the

⁄8 amp

fuse was replaced with electronic protection for trigger

circuit faults to electrode circuit.

On G1757-2 through -5 part no. PC boards, the

⁄8 amp

fuse interrupts the 500A lead to the trigger switch. On

G1757- 1 PC boards a 5 amp fuse was used to

interrupt the 667 lead. The LN-25™ will not operate if

the fuse is blown.

AUTOMATIC PROTECTION SHUTDOWN

(See Automatic Protection Shutdown Section.)

ADJUSTING SPEED

SENSOR MODULE

The LN-25™ Speed Sensor Module is a three lead

Hall Effect switch device encased in an externally

threaded housing which is screwed into a mounting

plate on the motor side of the wire drive gearbox.

ROUTINE MAINTENANCE

DRIVE ROLLS AND GUIDE TUBES

After feeding every coil of wire, inspect the drive roll

section. Clean it as necessary. Do not use a solvent

for cleaning the idle roll because it may wash the lu -

bricant 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 must be

changed.

The drive rolls for .035 through .052 cored electrode

and

⁄16 through

⁄64 electrode have a double set of teeth

so they can be reversed for additional life. Drive rolls

for .023 through .052 solid electrode and aluminum

sizes have no teeth but use two grooves so they also

can be reversed for additional life.

See Wire Feed Drive Roll and Guide Tube Kits Sec -

tion for roll changing instructions.

WIRE REEL SPINDLE

No routine maintenance required. Do not lubricate

spindle.

WARNING

SAFETY PRECAUTIONS

CONTROL BOX

Every six months open and inspect the control sec -

tion. The accumulated dirt should be gently blown off

all of the electrical components. Be sure the air that

is being used is dry. Check that lead plugs are secure

in their receptacles.

WIRE DRIVE MOTOR AND GEARBOX

Every year examine the gearbox. Paint the gear teeth

with molydisulfide filled grease. Do not use a graphite

grease.

Check the motor brushes. Replace if they are worn

down to

⁄4’’ or less. When ordering feed motor

br ushes, give a l l in for m a t i on f r o m th e motor

name plate.

GUN AND CABLE MAINTENANCE

See IM manual provided with the gun and cable as -

sembly.

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Lincoln-electric LN-25 SVM114-C User Manual Page 30

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