Section 10- Maintenance; Routine Maintenance - Miller Electric S-21E Technical Manual

10-1. ROUTINE MAINTENANCE (Table 10-1)
Every six months inspect the labels on
IMPORTANT:
this unit for legibility All precautionary labels must be
maintained in a clearly readable state and replaced
when necessary. See Service Parts Manual for part
number of precautionary labels.
A WARNING: ELECTRIC SHOCK can kill.
• Do not touch live electrical parts.
• Shut down wire feeder and welding power
source, and disconnect input power employ-
ing lockout/taggin9 procedures before in-
spectIng, maintaining, or servicing.
Lockout/tag9ing procedures for wire feeder
consist of disconnecting interconnecting cord,
and for welding power source consist of pad-
locking line disconnect switch in open position,
removing fuses from fuse box, or shutting off
and red-tagging circuit breaker or other discon-
necting device. Stop engine, and disconnect
(—)
negative battery cable from battery on weld-
ing generators.
• Allow gun and unit to cool before touching.
• Do not depress gun trigger while performing
maintenance on gun.
Troubleshooting to be performed only by quali-
fied persons.
Table 10-1. Maintenance Schedule
Frequency*
Every Month Units in heavy service environ
ments: Check labels, weld cables,
clean internal parts and drive rolls.
Every 6 Months Check all labels (see IMPORTANT
block, Section 10-1). Inspect q un
and cables (Section 10-1 B). Clean
drive rolls (Section l0-lC).
*Frequency of service is based on units operated 40
hours per week. Increase frequency of maintenance if
usage exceeds 40 hours per week.
A. Internal Cleaning
A
ARNING: Read and follow safety informa-
tion at beginning of entire Section 10-1 be-
fore proceeding.
Every month, blow our or vacuum dust and dirt from the
inside of the wire feeder. Remove the outer enclosure,
and use a clean, dry airstream orvacuum suctionfor the
cleaning operation. If dusty or dirty conditions are pre-
sent, clean the unit monthly.
B. Inspection and Upkeep
A
ARNING: Read and follow safety Informa-
tion at beginning of entire Section 10-1 be-
fore proceeding.
S-21E
SECTION 10— MAINTENANCE
Maintenance
Every six months, inspect the gun, hoses, and cables. If
dusty or dirty conditions are present, inspect the unit
monthly. Inspection should consist of the following:
1. Unlatch and open left case access door.
2. Inspect gun for broken areas, cracks, and loose
parts; tighten, repair, and replace as required.
3. Repair or replace, as required, all hose and ca-
ble; give particular attention to frayed and
cracked insulation and areas where hose and ca-
bles enter equipment.
4. Remove grease and grime from components,
moisture from electrical parts and cable.
A CAUTION: FLYING DIRT AND METAL PARTI-
CLES can injure personnel and damage
equipment.
• Point gun liner only in a safe direction away
from personnel and equipment when clean-
ing with compressed air.
5. Blow out the gun wire guide liner with com-
pressed air when changing wire. This will remove
any metal chips and dirt that may have accumu-
lated.
6. Close and secure left case access door.
C. Cleaning Of Drive Rolls
A
WARNING: Read and follow safety informa-
tion at beginning of entire Section 10-1 be-
fore proceeding.
MOVING PARTS can cause serious injury.
• Keep away from moving parts.
HIGH ROTATIONAL SPEED may cause
damage to drive rolls and injure personnel.
• Do not allow drive rollsto rotate at high speed
if compressed air is used for cleaning the
drive rollassembly
It is necessary to remove the drive rolls forproperclean-
ing of the wire grooves (see Section 4-2 for removal and
installation instructions). Use a wire brush to clean rolls.
Failure to properly maintain the drive rolls
IMPORTANT:
can result in a buildup of wireparticles which decreases
the efficiency of the wire feeding operation.
1. Remove the three drive roll securing screws from
each drive roll, and remove drive rolls.
2. Using wire brush, remove the buildup of wire
particles in the wire grooves.
3. Reinstall drive rolls according to Section 4-2.
4. Resume operation.
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