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INSTRUCTIONS
FOR
USE
OF
THE
NYLON CUTTING
HEAD
(Model
WBC253)
(BUMP
&
FEED
BF4)
*
I
Safety Instructions
1
2
Read
this
section carefully and thoroughly before use
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
40)
Dents appear on the knob head
The
"Limit
marks (notches)"
on
the cover have
disappeared
Fig
40
The housing (cover)
is
damaged
or
cracked
1.
'===
__
-
3
Wear appropriate clothing and protectors
r-
4
Always stop the engine before inspecting the
cutting
head
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
Never use the cutting head
BF4
on
tools
with
a cutter
head speed higher than
10,000
RPM
6
installation
_.
~___
j
i
See page
5
(Mounting the
nylon
cutting head)
Fig
41
_-
I
1
r3
'
,
0
pera ti
on
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
41)
for more effective
cutting.
When
the
nylon cord wears down (becomes
short),
decrease the engine speed
to
under
4,000
RPM
and tap
the
knob
of
the nylon cutting head against
the ground
to
advance the nylon cord
(Fig
42)
2
Fig.
42
r
I
Fio.
43
.,
Parts
Breakdown
I
17