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INSTRUCTIONS FOR
USE
OF
THE
NYLON CUTTING
HEAD
(BUMP
&
FEED BF4)
Safety Instructions
1.
Read
this
section carefully and thoroughly before use.
2.
Check the nylon
cutting
head carefully before each
use.
If
you notice any of following, replace the worn
or
damaged parts
with
new
ones immediately
(Fig.
19):
Dents appear on the knob head.
The housing (cover)
is
damaged or cracked.
The
"Limit
marks (notches)" on the cover have
disappeared.
3.
Wear appropriate clothing and protectors.
4.
Always stop
the
engine before inspecting the cutting
head
BF4
or replacing the nylon cord.
5.
Do
not
allow anyone near
the
operation area. The
cutters
might
send stones or debris
flying,
possibly
harming bystanders.
6.
Never
use
the
cutting head
BF4
on
tools
with
a cutter
head speed higher than
10,000
RPM.
Installation
See page
5
(Mounting the nylon cutting head)
Operation
1.
Increase the cutter head speed to approx.
6,000
RPM.
Low speed (under 4,000
RPM)
causes
inefficient cutting. Use the
tip
of
the nylon cord
(shaded area shown
in
Fig.
20)
for more effective
cutting.
2.
When the nylon cord wears down (becomes short),
decrease the engine speed to
under
4,000
RPM
and
bump
the
knob of
the
nylon cutting head
against the ground to feed
out
the nylon cord
(Fig.
211.
I
I
Fia.
22
imit
mark
(notch)
Fig.
19
$i
Shaded area
Fig.
20
I
I
Fig.
21
-
I
Parts
Breakdown