Lincoln Electric IM663 RED-D-ARC D300K 3+3 - Manual (Page 17)

D-2 MAINTENANCE D-2
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. The positive (+) battery cable has a red terminal
cover.
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 so can result in
damage to the internal charger components. When
re-connecting the cables, connect the positive cable
first and the negative cable last.
Hardware
Both English and Metric fasteners are used in this
welder.
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 the Fuel System
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, (EG. the engine was
allowed to run out of fuel) perform the following steps
using qualified personnel:
1. Verify that there is sufficient fuel in the fuel tank.
(Minimum of .50” of fuel).
2. If equipped with a fuel sediment bowl be sure that the
valve is open. (located on underside of fuel tank).
3. Open the air bleed screw on the fuel injection pump.
Using the starter, crank the engine until engine starts.
(use pre-heat if needed. DO NOT CRANK STARTER
FOR MORE THAN 1 MINUTE OUT OF 5 MINUTES.
4. Close air bleed screw when fuel is observed returning
to the fuel tank. (Remove fuel cap to observe).
GASES FROM BATTERY can explode.
• Keep sparks, flame and cigarettes away
from battery.
To prevent EXPLOSION when:
• INSTALLING A NEW BATTERY - discon-
nect negative cable from old battery first
and connect to new battery last.
• CONNECTING A BATTERY CHARGER - Remove bat-
tery from welder by disconnecting negative cable
first, then positive cable and battery clamp. When
reinstalling, connect negative cable last. Keep well
ventilated.
• USING A BOOSTER - connect positive lead to battery
first then connect negative lead to engine foot.
BATTERY ACID CAN BURN EYES AND
SKIN.
• Wear gloves and eye protection and be
careful when working near battery.
Follow instructions printed on battery.
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WARNING
Slip Rings
A slight amount of darkening and wear of the slip rings
and brushes is normal. Brushes should be inspected
when a general overhaul is necessary. If brushes are
to be replaced, clean slip rings with a fine emery
paper.
Do not attempt to polish slip rings while engine is
running.
------------------------------------------------------------------------
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%.
Battery
CAUTION
Have an experienced 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.
Arcing or excessive exciter brush wear indicates a
possible misaligned shaft. Have an authorized
Service Shop check and realign the shaft.
WARNING
D300K 3+3