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-14- H4378/H4379 Slimline Bench Grinder
SECTION 6: MAINTENANCE
Always be aware of the condition of your grinder.
Routinely check the condition of the following
items and repair or replace as necessary:
• Loose mounting bolts
• Worn switch
• Worn or damaged cord
• Worn or damaged support bearings or guide
bearings
• Damaged grinding wheel
• Any other condition that could hamper the
safe operation of this machine.
General
Sealed and pre-lubricated ball bearings require
no lubrication for the life of the bearings. All bear-
ings are standard sizes, and replacements can be
purchased from our parts department or a bearing
supply store.
Lubrication
The grinding wheel should be inspected before
every use. Use the “ring test” method from page
12 “Wheel Mounting” instructions to verify the
structural integrity. If using coolant during grind-
ing, always run the wheel for 5-10 minutes at the
end of the operation to remove any coolant from
the wheel. Take care in storing grinding wheels to
keep them free from potential damage by being
dropped or having other items dropped on them.
Replace the wheel when the wheel diameter is
reduced to 4" on the Model H4378 and 6" on the
Model H4379. Operating at anything less than this
diameter does not allow the proper alignment of
the tool rest and the eye shield.
Depending on the type of grinding you do, the
grinding wheel may require periodic dressing.
There are several different types of wheel dress-
ing devices available on the market. Use a suit-
able diamond or silicon carbide stick type dress-
er. Sweep it smoothly and evenly several times
across the face of the wheel. Dressing restores
the abrasive quality of the wheel surface, plus it
will bring the wheel edge back to a square form.
Refer to the instructions that accompany your
dressing accessory for complete details on wheel
dressing.
Grinding Wheels
Disconnect power to the
machine when perform-
ing any maintenance,
assembly or adjust-
ments. Failure to do this
may result in serious
personal injury.
!
NOTICE
If the grinder is unmounted from the work-
bench for maintenance, the cooling tray can
be easily damaged if the grinder is tipped for-
ward.