Lincoln Electric PERKINS SA-250 - Manual (Page 17)

3. Change the crankcase oil at regular intervals using
the proper grade of oil as recommended in the
engine operating manual.
4. Change the oil filter in accordance with the instruc-
tions in the engine operator’s manual. When the
filter is changed, add a quart of oil to the crankcase
to replace the oil held in the filter during operation.
5. Inspect the air filter daily - more often in dusty con-
ditions. When necessary, clean or replace. The
filter should never be removed while the engine is
running.
6. Change the diesel fuel filters every 500 hours of
operation.
7. Fan belts tend to loosen after the first 30 or 40
hours of operation. Check and tighten if neces-
sary. DO NOT OVERTIGHTEN.
8. Put a drop of oil on the “Current Range Selector”
shaft at least once every month.
9. See the engine manufacturer’s Operating Manual
for detailed engine maintenance and troubleshoot-
ing instructions.
Cooling System
The SA-250 is equipped with a pressure radiator.
Keep the radiator cap tight to prevent loss of coolant.
Clean and flush the cooling system periodically to pre-
vent clogging the passage and overheating the
engine. When antifreeze is needed, always use the
permanent type.
Bearings
This welder is equipped with a double-shielded ball
bearing having sufficient grease to last indefinitely
under normal service. Where the welder is used con-
stantly or in excessively dirty locations, it may be nec-
essary to add one-half ounce of grease per year. A
pad of grease one inch wide, one inch long, and one
inch high weighs approximately one-half ounce.
Over-greasing is far worse than insufficient greasing.
When greasing the bearings, keep all dirt out of the
area. Wipe the fittings completely clean and use
clean equipment. More bearing failures are caused
by dirt introduced during greasing than from insuffi-
cient grease.
Commutator & Brushes
Uncovered rotating equipment can be dangerous.
Use care so your hands, hair, clothing or tools do
not catch in the rotating parts. Protect yourself
from particles that may be thrown out by the rotat-
ing armature when stoning the commutator.
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The generator brushes are properly adjusted when
the welder is shipped. They require no particular
attention. DO NOT SHIFT THE BRUSHES or adjust
the rocker setting. Shifting of the brushes may result
in:
• change in machine output
• commutator damage
• excessive brush wear
Periodically inspect the commutator, slip rings and
brushes by removing the covers. DO NOT remove or
replace these covers while the machine is running.
Commutators and slip rings require little attention.
However, if they are black or appear uneven, have
them cleaned by an experienced maintenance man
using fine sandpaper or a commutator stone. Never
use emery cloth or paper for this purpose.
NOTE: If the welder is used in dirty or dusty locations,
or if the welder is not used for prolonged periods of
time, it may be necessary to clean the commutator
and slip rings more often.
Replace brushes when they wear within 1/4” 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 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 the 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%.
Arcing or excessive exciter brush wear indicates a
possible misaligned shaft. Have an authorized Field
Service Shop check and realign the shaft.
– 16 –
ORDERING INFORMA-
TION
COOLING SYSTEM
CAPACITY
K1283-ALL 10 Quarts
WARNING