Filter
Top Products
MAINTENANCE
D4.3 D4.3
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 maintenance
man seat these brushes by lightly stoning the commu-
tator as the armature rotates at full speed until contact
is made across the full face of the brushes. After ston-
ing, 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 MAINTENANCE
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 con-
nected properly. The correct polarity is negative
ground. Damage to the engine alternator and the print-
ed circuit board can result from incorrect connection.
1. Proper operation of the idler requires good ground-
ing of the printed circuit board, reed switch, and bat-
tery.
2. Idler solenoid is activated for low idle.
3. 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 replacement
item number.
PURGING AIR FROM FUEL SYSTEM
(PERKINS 404D-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.
------------------------------------------------------------------------
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. Loosen by two or three turns, the vent screw
(Figure D4.3) on the fuel inlet connection.
FIGURE D4.3
2. 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.
CAUTION
WARNING
Vent Screw
Priming
Lever
Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC
Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC