Advertisement
INSTRUCTIONS FOR
U S E 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 o f 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 R P M
6
installation
_.
~ _ _ _
j
i
See page 5 (Mounting the nylon cutting head)
Fig
4 1
_-
I
1
r 3
'
,
0 pera ti o n
1
Increase
t h e
cutter head speed to approx
6 000
RPM Low speed (under 4,000 RPM) causes
inefficient cutting Use the
tip
o f the nylon
cord
(shaded area shown in Fig
41)
for more effective
cutting.
When
t h e
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
Advertisement
