Lincoln Electric CLASSIC 300 D - Manual (Page 19)

D-2 MAINTENANCE D-2
Replace brushes when they wear within 1/4”(3.5mm)
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 experi-
enced maintenance 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
possible misaligned shaft. Have an authorized Field
Service Shop check and realign the shaft.
IDLER MAINTENANCE
Before doing electrical work, disconnect the bat-
tery.
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When installing a new battery or using a jumper bat-
tery to start the engine, be sure the battery polarity is
connected properly. The correct polarity is negative
ground. Damage to the engine alternator and the
Engine Control Unit can result from incorrect connec-
tion.
1. Proper operation of the idler requires good
grounding of the Engine Control Unit, current
sensing printed circuit board and battery.
2. If desired, the welder can be used without automat-
ic idling by setting the “Idler” switch to the “High”
position.
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.
P U R G I N G A I R F R O M F U E L S Y S T E M
(KUBOTA V2403M 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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If the engine is running rough and you suspect air has
been trapped in the fuel system, (e.g. the engine was
allowed to run out of fuel) perform the following steps
using qualified personnel:
1. Fully open the air bleeding valve by turning it
counter clockwise, it is located on top of the fuel
injection pump next to the oil filler. (see figure D.1)
FIGURE D.1
2. Turn the engine by pressing the start button until
the engine runs smoothly (this should take approxi-
mately 10 seconds).
3. Fully close the air bleeding valve by turning it
clockwise.
Contact your Kubota Engine repair facility if problems
persist.
CLASSIC® 300D KUBOTA
CAUTION
WARNING
Air Bleeding
Valve