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-16- H3368 Grinder/Sander Combo
Replacing Wheels
4. An undamaged wheel will emit a clear metal-
lic ring or “ping” sound in each of these spots.
A damaged wheel will respond with a dull
thud that has no clear tone.
5. If you determine from the ring test that the
wheel is damaged, DO NOT use it!
To remove/mount a wheel:
1. Disconnect the machine from the power
supply!
2. Remove the 3 Phillips head screws and nuts
that go through the outer guard. Take off the
outer guard and the rim guard.
3. Use a wrench on the nut that holds the wheel
on the arbor. Hold the wheel from turning
with your other hand. The grinding wheel
arbor has a left-handed thread, so loosening
the nut will require turning it clockwise.
4. Remove the outer wheel flange and the
paper disc. Pull the wheel free from the
arbor. There will also be a paper disc and a
wheel flange on the back side of the wheel.
Omitting the paper discs during assembly
can put undue stress on the wheel, causing
it to crack and possibly fall apart! NEVER
assemble a grinding wheel on the arbor
without paper or fiber discs between the
wheel and the flange.
Figure 13. Wheel mounting order.
Flange
Flange
Nut
Wheel
Paper/Fiber
Disc
Paper/Fiber
Disc
6. Re-install the guards and shields.
7. Run a new wheel for at least 1 minute while
standing clear of the line of rotation. If a
wheel does have defects it will generally fail
as soon as it gets up to full speed.
5. Mount the new wheel in the reverse order or
as shown in Figure 13. Always make certain
there is a paper or fiber disc between the
wheel flanges and the wheel itself. Tighten
the nut snugly but DO NOT over-tighten.
Over-tightening can crack the wheel.
The hazards of using a damaged wheel
include flying chunks of sharp abrasive
material that could cause serious injury or
death. Inspect every grinding wheel before
it is mounted and DO NOT use a damaged
grinding wheel!
The wheel guard assembly must be removed in
order to mount or dismount a grinding wheel.