Miller Electric M-25 - Manual (Page 12)

OM-227 796 Page 8
5-3. Routine Maintenance
Y Turn Off welding power source and disconnect gun before maintaining.
Each Spool Of Wire
Blow Out
Gun
Casing
Clean
Nozzle
And Check
Contact Tip
3 Months
Control
Cord
Gas
Hose
Replace
Cracked
Parts
5-4. Troubleshooting
Trouble Remedy
Wire does not feed; wire is not ener-
gized; wire feeds unevenly
Check contact tip. Check for kinks in gun cable.
gized; wire feeds unevenly.
Check gun trigger plug connection at welding power source/wire feeder.
Check, and if necessary, replace gun trigger switch (see Section 5-2).
Check contact tip. Check for kinks in gun cable. Blow out liner and gun casing (see Section 5-1).
Weld porosity. Remove weld spatter buildup in nozzle.
Make sure inner head tube is tight in cable connector.
Check shielding gas flow/supply.
Wire feeding stops or does not feed
properly during welding.
Straighten gun cable and/or replace damaged parts (see Section 5-1).
Adjust drive roll pressure (see wire feeder manual).
Change to proper drive roll groove (see wire feeder manual).
Readjust hub tension (see wire feeder manual).
Clean or replace liner if dirty or plugged (see Section 5-1).
Replace drive roll or pressure bearing if worn or slipping (see wire feeder manual).