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24. When servicing a tool, use only identical
replacement parts. Follow instructions in
the Maintenance section of this manual.
Use of unauthorized parts or failure to follow
Maintenance instructions may create a risk of
electric shock or injury.
USE PROPER EXTENSION CORD: Make sure your extension cord is in good condition.
When using an extension cord, be sure to use one heavy enough to carry the current your
product will draw. An undersized cord will cause a drop in line voltage resulting in loss of
power and overheating. Table 1 shows the correct size to use depending on cord length and
nameplate ampere rating. If in doubt, use the next heavier gage. The smaller the gage
number, the heavier the cord.
SPECIFIC SAFETY RULES USB005-3
DO NOT let comfort or familiarity with product (gained from
repeated use) replace strict adherence to grinder safety rules. If
you use this tool unsafely or incorrectly, you can suffer serious
personal injury.
1. Always use proper guard with grinding
wheel. A guard protects operator from bro-
ken wheel fragments.
2. Accessories must be rated for at least the
speed recommended on the tool warning
label. Wheels and other accessories running
over rated speed can fly apart and cause
injury.
3. Hold tool by insulated gripping surfaces
when performing an operation where the
cutting tool may contact hidden wiring or
its own cord. Contact with a “live” wire will
make exposed metal parts of the tool “live”
and shock the operator.
4. When using depressed center grinding
wheels, be sure to use only fiberglass-
reinforced wheels.
5. Always use safety glasses or goggles.
Ordinary eye or sun glasses are NOT
safety glasses.
6. Check the wheel carefully for cracks or
damage before operation. Replace
cracked or damaged wheel immediately.
Run the tool (with guard) at no load for
about a minute, holding tool away from
others. If wheel is flawed, it will likely sep-
arate during this test.
7. Use only flanges specified for this tool.
Table 1: Minimum gage for cord
Ampere Rating
Volts Total length of cord in feet
120 V 25 ft. 50 ft. 100 ft. 150 ft.
More Than Not More Than AWG
0 6 18 16 16 14
6 10 18161412
10 12 16 16 14 12
12 16 14 12 Not Recommended