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F-74 F-74
FAN MOTOR AND BLADE REMOVAL AND REPLACEMENT (continued)
FIGURE F.25- FAN MOTOR AND BLADE MOUNTING DETAILS
TROUBLESHOOTING & REPAIR
PROCEDURE
The following procedure allows you to remove
and replace either of the two fans on the
Square Wave TIG 355.
1. Remove the input power to the machine.
2. With the 5/16" nut driver, remove the case
top and sides.
3. Perform the Input Power Factor Capacitor
Voltage Check.
For Steps 4-11, refer to Figure F.25.
4. With the 1/4" nut driver, loosen the fan
blade clamp and slide the blade from the
motor shaft. Note blade placement on the
shaft for reassembly.
5. With the 11/32" wrench, remove the nuts,
lock washers, and flat washers that mount
the fan motor to the fan bracket.
6. Cut any cable ties or wire leads.
7. Carefully remove the fan motor from the fan
bracket.
NOTE: You may have to loosen or remove the
bottom case back screws to gain enough
clearance to remove the motor.
8. Replacement: Mount the fan motor to the
fan bracket with the flat washers, lock
washers, and nuts removed earlier. Use
the 11/32" wrench.
9. Slide the fan blade onto the fan motor
shaft. Note its proper placement. With
the 1/4" nut driver, tighten the fan blade
clamp.
10. Splice or resolder any wires cut during
removal. Insulate connectors. Replace
cable ties as necessary.
11. With the 5/16" nut driver, install the case
top and sides.
SQUARE WAVE TIG 355
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