Husqvarna K 770 Operator's Manual page 15

WARNING: Government regulation requires
a different type of guarding for carbide
tipped blades not available on power cutters
– a 360 degree guard. Power Cutters (this
saw) use diamond blades and have a
different guarding system which does not
provide protection against the dangers
presented by wood cutting blades.
Use of this power cutter with a carbide tipped blade is a
violation of work safety regulations.
Due to the hazardous nature and exigent circumstances
involved with fire fighting and rescue operations
conducted by the various highly trained public safety
forces, safety professionals (fire departments),
Husqvarna is aware that they may use this power cutter
with carbide tipped blades in certain emergency
situations due to the ability of carbide tipped blades to
cut many different types of obstructions and materials in
combination without having to take time to switch blades
or machines. When using this power cutter be aware at
all times that carbide tipped blades are more kickback
prone than diamond blades if not used properly. Carbide
tipped blades can also throw pieces of material away
from the blade.
For these reasons, a power cutter equipped with a
carbide tipped blade should never be used except by
highly trained public safety professionals who are aware
of the risks associated with its use and then only in
those exigent circumstances when other tools are
deemed inefficient and ineffective for fire or rescue
operations. A power cutter equipped with a carbide
tipped blade should never be used to cut wood in non-
rescue operations.
To examine the spindle shaft and the
flange washers
CAUTION: Use only Husqvarna flange
washers with a minimum diameter of 105
mm/4.1 in.
WARNING: Do not use defective, worn or
dirty flange washers. Use only flange
washers of the same dimension. Incorrect
flange washers can cause the cutting blade
to become damaged or come loose.
Examine the spindle shaft and the flange washers when
you replace the cutting blade.
1447 - 001 - 16.04.2020
1. Make sure that the threads on the spindle shaft are
not damaged. Replace damaged parts.
2. Make sure that the areas of contact on the cutting
blade and the flange washers are not damaged.
Replace damaged parts.
3. Make sure that the flange washers are clean and of
the correct dimension.
4. Make sure that the flange washers move freely on
the spindle shaft.
To do a check of the arbor bushing
The arbor bushings are used to attach the product to the
center hole of the cutting blade. The product is supplied
with one of these two types of arbor bushings:
• An arbor bushing that can be turned to the other side
and be applicable for 20 mm/0.79 in. or 25.4 mm/1
in. center holes.
• A 25.4 mm/1 in. arbor bushing.
• A decal on the blade guard shows installed arbor
bushing and specification for applicable cutting
blades.
• Make sure that the dimension of the center hole of
the cutting blade agrees with the installed arbor
bushing. The diameter of the center hole is printed
on the cutting blade.
• Use only Husqvarna arbor bushings.
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