Lincoln Electric IM553 CLASSIC II - Manual (Page 15)

D-2 D-2
Commutator and Brushes
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 set-
ting.
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 slip ring brushes, position the brushes in
place. Then slide one end of a piece of fine sandpa-
per between slip rings and brushes with the coarse
side against the brushes. With slight additional finger
pressure 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%.
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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Arcing or excessive exciter brush wear indicates a
possible misaligned shaft. Have an authorized Field
Service Shop check and realign the shaft.
Idler Maintenance
1. The solenoid plunger must work freely and not bind.
Dust the plunger about once a year with graphite
powder.
2. Proper operation of the idler requires good ground-
ing of the printed circuit board, reed switch,
and battery.
3. If desired, the welder can be used without automat-
ic idling by setting the “Idler” switch to the “High”
position.
Before doing electrical work on the idler printed
circuit board, disconnect the battery. When
installing a new battery or using a jumper battery
to start the engine, be sure the battery polarity is
connected properly. The correct polarity is nega-
tive ground. Damage to the engine alternator and
the printed circuit board can result from incorrect
connection.
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Nameplates
Whenever routine maintenance is performed on this
machine - or at least yearly - inspect all nameplates
and labels for legibility. Replace those which are no
longer clear. Refer to the parts list for the replace-
ment item number.
WARNING
CAUTION
CLASSIC II DEUTZ
MAINTENANCE