10 - maintenance, 1. routine maintenance – Miller Electric S-21E User Manual

Page 29

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SECTION 10— MAINTENANCE

A

10-1. ROUTINE MAINTENANCE (Table 10-1)
IMPORTANT:

Every six months inspect the labels on

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.

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*

Maintenance

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.

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.

IMPORTANT:

Failure to properly maintain the drive rolls

can result in a buildup of wire particles 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.

S-21E

TM-1571 Page 25

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