Lincoln Electric K3269-1, Operator'S Manual

Page: 33 / 118

TROUBLESHOOTING
E-3
TROUBLESHOOTING
E-4
Observe all Safety Guidelines detailed throughout this manual
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your Local
Lincoln Authorized Field Service Facility for technical troubleshooting assistance before you proceed.
CAUTION
PROBLEMS
PROBLEMS
(SYMPTOMS)
POSSIBLE
CAUSE
RECOMMENDED
COURSE OF ACTION
Intermittent wire feed when trigger is
pulled.
Frequent occurrence of contact tip burn-
back.
Poor weld bead appearance (porosity or
dull gray oxidized surface).
1. Wire is mechanically binding along its
feed path inside gun.
2. Drive roll has become loose on hub
and output shaft.
3. Drive roll has become galled with alu-
minum.
4. Wire has become kinked along its feed
path.
5. Idle roll assembly is installed back-
wards.
6. Liner assembly is shaving wire.
1. Improper welding parameters or tech-
nique. (Example: CTWD (Contact Tip
to Work Distance) is incorrect.
2. Wire may be feeding intermittently.
1. No gas flow.
2. Low gas flow.
3. Improper or contaminated shielding
gas.
4. Welding in a windy environment..
5. Improper electrode polarity.
6. Improper welding parameters or tech-
nique.
1. Check that wire is properly aligned
inside gun.
2. Check that drive roll is securely fas-
tened in place by SHCS (socket head
cap screw); replace hub and twist-lock
if worn.
3. Remove and then clean or replace
drive roll. (See Maintenance Section)
4. Manually pull wire slowly thru gun until
unkinked wire emerges.
5. Install properly. (See Maintenance
Section)
6. Check that wire is properly aligned at
liner inlet; realign gun tube with wire
drive. (See Correcting Wire Shaving
Issues Maintenance Section)
1. See Operation Section for proper
Welding information.
2. See symptoms on intermittent or slug-
gish wire feed.
1. See symptom "Low or no gas flow"
2. See symptom "Low or no gas flow"
3. Check that the gas supply s labeling
reads 100% argon. Temporarily use
alternate, known gas supply and check
for appearance improvement.
4. Erect a wind shield or move to a non-
windy location before welding.
5. Reconnect machine s welding output
to electrode positive polarity.
6. See Operation Section for information.
Observe all Safety Guidelines detailed throughout this manual
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your Local
Lincoln Authorized Field Service Facility for technical troubleshooting assistance before you proceed.
CAUTION
PROBLEMS
PROBLEMS
(SYMPTOMS)
POSSIBLE
CAUSE
RECOMMENDED
COURSE OF ACTION
Low or no shielding gas flow.
Wire feeder runs or begins feeding
wire without pulling the gun trigger.
1. Out of gas.
2. Gas supply is turned off or discon-
nected.
3. Gas supply flow regulator is
improperly set.
4. Machineʼs gas solenoid valve has
malfunctioned.
5. Blockage in gun along gas path.
6. Gun cable kinked or flattened.
7. Blockage due to excessive spatter
accumulation on gas nozzle or
gas
diffuser.
8. Excessive gas leakage from sup-
ply.
9. Gas leakage in gun between liner
assembly and cable connector.
10. Gas leakage at gun-to-feeder
connection.
1. Defective trigger. (contacts closed)
2. Defective (closed) trigger circuit in
the welding machine.
3. Trigger lead(s) inside gun cable
are shorted together or commonly
shorted to either welding or motor
circuits.
1. Check that an adequate gas sup-
ply is available.
2. Check that all gas supply valves
are open.
3. Check that gas flow is set between
20 to 50 SCFH.
4. See machineʼs instruction manual.
5. Gently blow out debris from core
tube.
6. Attempt to straighten out cable, or
replace cable. (See Maintenance
Section)
7. Clean or replace gas nozzle or
gas
diffuser.
8. Find and repair all leaks.
9. Replace liner assembly. (See
Maintenance Section)
10. Damaged o-rings: replace both
seals. Gun connector not fully
inserted into machine (See
Installation Section).
1. Replace trigger. (See
Maintenance Section)
2. See machineʼs instruction manual
3. Damaged control leads between
machineʼs P6 connector and
cable;
repair if possible.
Otherwise, replace gun cable.
(See Maintenance Section) for
both.