Lincoln Electric IM694 RED-D-ARC D503K 5+3 HO - Manual (Page 16)

D-2 MAINTENANCE D-2
D503K 5+3 HO
COMMUTATOR AND BRUSH MAINTENANCE
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 man
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
pigtail. A complete set of replacement brushes should
be kept on hand. Lincoln brushes have a curved face
to fit the commutator. Have an experienced mainte-
nance man seat these brushes by lightly stoning the
commutator as the armature rotates at full speed until
contact 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
possible misaligned shaft. Have an authorized Field
Service Shop check and realign the shaft.
COOLING SYSTEM
The D503K 5+3 HO is equipped with a pressure radia-
tor. Keep the radiator cap tight to prevent loss of
coolant. Clean and flush the cooling system periodi-
cally to prevent clogging the passage and overheating
the engine. When antifreeze is needed, always use
the permanent type.
1. When replacing, jumping, or otherwise connecting
the battery to the battery cables, the proper polarity
must be observed. Failure to observe the proper
polarity could result in damage to the charging cir-
cuit.
2. If the battery requires charging from an external
charger, disconnect the negative battery cable first
and then the positive battery cable before attaching
the charger leads. Failure to do socan result in
damage to the internal charger components. When
reconnecting the cables, connect the positive cable
first and the negative cable last.
WARNING
BATTERY
GASES FROM BATTERY can explode.
• Keep sparks, flame and cigarettes
away from battery.
To prevent EXPLOSION when:
• INSTALLING A NEW BATTERY -
disconnect negative cable from old
battery first and connect to new bat-
tery last.
• CONNECTING A BATTERY CHARG-
ER - Remove battery from welder by
disconnecting negative cable first,
then positive cable and battery
clamp. When reinstalling, connect
negative cable last. Keep well venti-
lated.
• USING A BOOSTER - connect posi-
tive lead to battery first then con-
nect negative lead to engine foot.
BATTERY ACID CAN BURN EYES
AND SKIN.
• Wear gloves and eye protection and
be careful when working near bat-
tery. Follow instructions printed on
battery.
WARNING