Lincoln Global SA-250, Руководство оператора

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D-2
MAINTENANCE
D-2
Lincoln brushes have a curved face to fit the commu-
tator. 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.
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. 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 on the idler printed
circuit board, disconnect the battery.
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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
printed circuit board can result from incorrect connec-
tion.
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. Idler solenoid is activated for high idle.
4. 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.
PURGING AIR from FUEL SYSTEM
(Perkins 104-22 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, (EG. the engine was
allowed to run out of fuel) perform the following steps
using qualified personnel:
1. Loosen by two or three turns, the vent screw
(Figure D.1) on the fuel inlet connection.
FIGURE D.1
2.
For Engines Equipped with a mechanical fuel pump:
Operate the priming lever on the fuel lift pump until
fuel, free of air, flows from the vent point. Tighten
the vent screw. If the pump is at the point of maxi-
mum lift, it will not be possible to operate the prim-
ing lever. If this occurs, turn the crankshaft one
revolution.
For Engines Equipped with an electric fuel pump:
Operate the electric fuel pump by turning the
“Ignition” switch “ON” until fuel, free of air, flows
from the vent point. Tighten the vent screw.
3. Contact your Perkins Engine repair facility if prob-
lems persist.
SA-250
CAUTION
WARNING
Vent Screw
Priming
Lever