Lincoln Electric LN-25 SVM114-C - Manual (Page 30)

MAINTENANCE D-2 D-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 1 ⁄
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 1 ⁄
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 1 ⁄
16
through 5 ⁄
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
d ow n t o 1 ⁄
4
’’ o r l e s s. W h e n o r d e r i n g fe e d m o t o r
b r u s h e s , g i v e a l l i n f o r m a t i o n f r o m t h e motor
name plate.
GUN AND CABLE MAINTENANCE
See IM manual provided with the gun and cable as -
sembly.
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