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MAINTENANCE
D5.3 D5.3
CLASSIC® 300D & 300G
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 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 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.
IDLER CONTROL MAINTENANCE
Before doing electrical work, disconnect the bat-
tery.
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When installing a new battery or using a jumper battery
to start the engine, be sure the battery polarity is con-
nected properly. The correct polarity is negative
ground. Damage to the engine alternator and the TBI
controller can result from incorrect connection.
• Proper operation of the idle control requires good
grounding of the TBI controller, and battery.
• If desired, the welder can be used without automatic
idling by setting the “Idler” switch to the “High” posi-
tion.
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 replacement
item number.
PURGING AIR FROM FUEL SYSTEM (GM
3.0L ENGINE)
Keep fuel clear of open flames or arcs, allow
engine to cool before working on the fuel system.
Wipe up any spilled fuel and do not start engine
until fumes clear.
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The fuel system operates as follows, The fuel pump
will operate for a maximum of 3 seconds when the igni-
tion switch is turned “ON”. The pump will restart once
the start button is pushed and continue when the
engine starts. To purge the system of air if fuel lines
have been removed, the ignition switch can be toggled
“ON” and “OFF” (at 3 second intervals) until fuel flows
through the fuel return line in the neck of the tank.
The GM 3.0L engine does not require the system to be
bled. If the engine runs out of fuel and the tank is
refilled, the engine will restart within a few seconds if
the engine is properly tuned.
ENGINE MAINTENANCE
Refer to the engine operation and maintenance manu-
al for additional information on the engine.
CAUTION
WARNING
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