Miller Gold Seal 420, Руководство пользователя

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OM-174 470 Page 8
4-3. Gun Maintenance
READ SAFETY BLOCKS at start of
Section 4 before proceeding.
WARNING
FLYING METAL CHIPS AND DIRT can cause injury and damage equipment.
•
Point gun away from people and in a safe direction when blowing out with compressed air.
swarn10.1 10/91
Turn Off and unplug unit.
1 Wire Spool
Cut welding wire off at contact tip.
Retract wire onto spool and secure.
2 Gun Securing Nut
Disconnect trigger leads. Loosen
nut and remove gun and trigger
leads.
3 Nozzle
4 Contact Tip
5 Head Tube
6 Liner Collet
Disassemble gun as shown.
7 Liner
Pull liner from this end. Blow gun
casing out with compressed air.
Insert new liner into gun casing until
even with end of head tube.
Install collet onto liner.
Install contact tip and nozzle.
Insert gun into feeder and mark
where liner touches drive roll.
Remove gun and cut liner off.
Reinstall gun so that liner is as
close as possible to drive rolls
without touching.
Thread welding wire (see Section
2-6). Close door.
Ref. ST-155 506–A / ST-155 509-A
Tools Needed:
3/8, 5/16 in
2 1
3
4
5
7
7
6
6
Figure 4-3. Gun Maintenance
4-4. Troubleshooting
READ SAFETY BLOCKS at start of
Section 4 before proceeding.
WARNING
Welding Trouble Remedy Section
No weld output; wire does not feed. Secure power cord plug in receptacle. 2-3
Motor fuse F1 open, replace F1. 4-1B
Replace building line fuse or reset circuit breaker if open. – –
Secure gun trigger leads or repair leads, or replace trigger switch. 2-5
No weld output; wire does not feed; fan
motor continues to run. Thermostat TP1 open (overheating). Allow fan to run; the thermo-
stat will close when the unit has cooled. 4-1A
No weld output; wire feeds. Connect work clamp to get good metal to metal contact. Figure 3-2
Replace contact tip. 4-3
Low weld output. Connect unit to proper input voltage or check for low line voltage. 2-3