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Blow out the welder and controls with an air hose at
least once every two months. In particularly dirty
locations, this cleaning may be necessary once a
week. Use low pressure air to avoid driving dirt into
the insulation.
“Current Range Selector” contacts should not be
greased. To keep the contacts clean, rotate the cur-
rent control through its entire range frequently.
Good practice is to turn the handle from maximum
to minimum setting twice each morning before start-
ing to weld.
Put a drop of oil on the “Current Range Selector”
shaft at least once every month.
Follow the engine service schedule in this manual
and the detailed maintenance and troubleshooting
in the engine manufacturer’s manual.
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The Classic® 300D Perkins is equipped with a pres-
sure radiator. Keep the radiator cap tight to prevent
loss of coolant. Clean and flush the cooling system
periodically to prevent clogging the passage and over-
heating the engine. When antifreeze is needed,
always use the permanent type.
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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 insufficient
grease.
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------------------------------------------------------------------------
Shifting of the commutator 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.
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