D. BLOWER MOTOR BRUSH REPLACEMENT
Factory installed blower motor has about 1400
hours of brush life. To prevent potential stall
problems during welding operation brushes
should be replaced after 1000 hours of operation.
To replace the brushes do the following:
1. Turn the power switch off and disconnect
power cord from supply.
2. Unplug thermocouple and fan-heating element
supply cord.
3. Remove the two #8-32 x 3/8 screws that hold
the blower motor housing.
4. Gently slide the motor housing away from the
blower motor.
5. Bend the brass flap on the brush holder
assembly about 90 degrees at both sides and
remove the old brushes.
6. By matching the cylindrical surface of the
brushes to the surface of the commutator, load
the new brushes into brush holder.
7. Bend the brass flaps back to their original
position.
8. Plug the main power and heatgun connectors
to the unit and run the blower motor for 3-4
seconds and observe the amount of sparks. If
sparks are larger than 1/16" consult the
manufacturer.
Motor
replacement
may
be
needed.
9. Unplug the main power and heatgun
connectors and slide the motor housing to the
original position. Fasten the mounting screws.
E. REPLACEMENT OF SCREEN.
Air screen should be cleaned as needed to
maintain proper air flow to prevent over heating
and loss of welding performance. After several
cleanings you may need to replace the screen. To
replace the screen do the following: (See Fig#10)
1. Turn the power switch off and disconnect power
cord from the power supply,
2. Using a small flat tip screwdriver pry off the air
damper,
3. Remove the defective screen and make sure
there are no pieces of screen remaining inside the
motor housing,
4. Place the new screen and air damper (best if
both replaced at the same time,
Warning:
Never punch the screen with a sharp
object to open air path. This will allow airborne
particles to get inside of the unit and shorten the
life of the moving parts and heating element.
-8-
Fig. #10
COOL DOWN 10 MINUTES
