Lincoln Electric SAE-400 Operator's Manual page 20

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COMMUTATOR AND BRUSH MAINTENANCE
WARNING
Uncovered rotating equipment can be dangerous.
Use care so your hands, hair, clothing or tools do
not catch in the rotating parts. Protect yourself
from particles that may be thrown out by the rotat-
ing armature when stoning the commutator.
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The generator brushes are properly adjusted when the
welder is shipped. They require no particular attention.
DO NOT SHIFT THE BRUSHES or adjust the rocker
setting.
Shifting of the brushes may result in:
- Change in machine output
- Commutator Damage
- Excessive brush wear
Periodically inspect the commutator, slip rings and
brushes by removing the covers. DO NOT remove or
replace these covers while the machine is running.
Commutators and slip rings require little attention.
However, if they are black or appear uneven, have
them cleaned by an experienced maintenance person
using fine sandpaper or a commutator stone. Never
use emery cloth or paper for this purpose.
NOTE: If the welder is used in dirty or dusty locations,
or if the welder is not used for prolonged periods of
time, it may be necessary to clean the commutator and
slip rings more often.
Replace brushes when they wear within 1/4" of the pig-
tail. A complete set of replacement brushes should be
kept on hand. Lincoln brushes have a curved face to fit
the commutator. Have an experienced maintenance
person seat these brushes by lightly stoning the com-
mutator as the armature rotates at full speed until con-
tact is made across the full face of the brushes. After
stoning, blow out the dust with low pressure air.
To seat the slip ring brushes, position the brushes in
place. Then slide one end of a piece of fine sandpaper
between slip rings and brushes with the coarse side
against the brushes. With slight additional finger pres-
sure on top of the brushes, pull the sandpaper around
the circumference of the rings, in direction of rotation
only - until brushes seat properly. In addition, stone
slip ring with a fine stone. Brushes must be seated
100%.
Arcing or excessive exciter brush wear indicates a pos-
sible misaligned shaft. Have an authorized Field
Service Shop check and realign the shaft.
MAINTENANCE
COOLING SYSTEM
The SAE-400
Keep the radiator cap tight to prevent loss of coolant.
Clean and flush the cooling system periodically to pre-
vent clogging the passage and overheating the engine.
When antifreeze is needed, always use the permanent
type.
FUEL PRE FILTER / WATER SEPARATOR
When working on the fuel system
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The SAE-400
Water Separator Assembly located before the lift
pump mounted to the engine block.
FUEL PRE-FILTER / WATER SEPARATOR
ASSEMBLY
The assembly uses a 30 micron pre-filter/water separator
element that is designed to protect against gross contam-
ination of the final fuel filter. Using chemically treated
paper media the element also provides maximum protec-
tion against water in the fuel. The assembly is also
equipped with a see-through bowl for easy visual check-
ing for water. The recommended change interval for the
pre-filter/water separator element is 1,000 hours. See
below for information on the see-through bowl and for the
procedure for changing the element.
See-Through Bowl:
• Check the see-through bowl for water regularly. Water
will collect at the bottom of the bowl and appears differ-
ent from the fuel.
Note: The see-through bowl is re-usable.
1. Close the fuel shut-off valve.
2. Drain by opening the self venting drain valve and allow-
ing all water to escape.
3. Close the drain valve and open the fuel shut-off valve.
Pre-Filter/Water Separator Element:
1. Close the fuel shutoff valve located under the fuel tank.
2. Rotate the quick change ring (located just below filter-
header) clockwise approximately 1/2 turn and slide it
down and off of the element.
3. Grasp the element and pull down with a slight rocking
motion to remove the element from the grommet post
on the bottom of the filter header.
SAE-400 ®
® is equipped with a pressure radiator.
WARNING
• Keep unguarded lights away, do not
smoke !
• Do not spill fuel !
is equipped with a Fuel Pre-Filter /
®
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