Lincoln Electric SQUARE WAVE TIG 175 IM605 - Manual (Page 18)

11 MAINTENANCE 11
SQUARE WAVE TIG 175
ELECTRIC SHOCK can kill.
• Only qualified personnel should
perform this maintenance.
• Turn the input power OFF at the
disconnect switch or fuse box
before working on this
equipment.
• Do not touch electrically hot
parts.
To avoid receiving a high frequency shock, keep the
TIG torch and cables in good condition.
1. Disconnect power supply lines to machine before
performing periodic maintenance.
2. Periodically clean the inside of the machine with a
low pressure air system. Be sure to clean the
following components thoroughly.
• Main Transformer
• Electrode/Gas Output Receptacle
• Polarity Switch
• Rectifier Assembly
• Arc Starter/Spark Gap Assembly
• PC Boards
• Fan Blades
3. Inspect welder output and control cables for
fraying, cuts, and bare spots.
4. Keep TIG torch and cables in good condition.
5. Clean air louvers to ensure proper air flow and
cooling.
6. The fan motor has sealed ball bearings which
require no maintenance.
7. The arc starter spark gap spacing is factory set at
0.015 inch. It typically will not require periodic
maintenance. Refinishing the contacts is not rec-
SAFETY PRECAUTIONS
ROUTINE AND PERIODIC MAINTENANCE
WARNING
WARNING
ommended. If the contacts are replaced reset the
gap spacing to 0.015. Refer to figure C.1. Note in
highly dirty environments where there is an abun-
dance of conductive contaminants, use a low pres-
sure air stream to clean the spark gap. Do not dis-
turb the factory setting.
8. Inspect gas hose and inlet fitting for cracks or
leaks.
9. Replace any unreadable labels or decals.
10. Verify that the machine and welding circuit is prop-
erly grounded.
.015 Spark Gap
LEFT SIDE OF MACHINE
FIGURE C.1 SPARK GAP
FAN MOTOR OR FAN BLADE REPLACEMENT
When installing a new fan blade or fan motor be sure
to maintain proper shaft spacing per Figure C.2 below.
Figure C.2