Bolens BL1740 Operator's Manual page 14

Service
Blade Care
WARNING:
When removing the cutting
blades
for
replacement,
protect your
hands
with
a
pair
of
heavy gloves or
use a
heavy rag
to
hold the blade.
Periodically inspect the blade adapter for
cracks,
especially
if
you
strike
a
foreign object.
Replace
when
necessary. Follow
the
steps
below for blade service.
1.
Disconnect spark
plug boot from spark plug. Turn mower
on
its
side making
sure
that the
air
filter and the carburetor
are
facing up.
2.
Remove
the bolt
and the flat
washer which hold the
blade
assembly and
the
blade adapter
to
the engine crankshaft.
Figure
7-1
Remove blade assembly and adapter
from
the crankshaft.
WARNING:
An unbalanced blade
will
cause
excessive
vibration when rotating
at
high
speeds.
lt
may
cause
damage
to
mower and could break
causing personal injury.
It
is
recommended that the
blades are
replaced in pairs
as
per the
following
steps.
a.
Remove each
swing blade by removing
the
locking
nut, flat
washer,
wave washer and
hex
bolt
(hardware kit) which attach it onto the
blade disc.
b.
Discard
the
worn
blades.
c.
Attach
the new swing
blades
with
a
new hardware
kit for
each,
following the assembly instructions
shown in Fig.7-2.
7
Figure
7-2
5.
Lubricate
the engine crankshaft and the inner surface
of
biade adapter with light oil.
Slide
the
blade adapter
onto
the engine crankshaft. Place
the blade assembly on the
adapter
such
that the side of
the
blade
without
a
wing
faces
the ground when the mower
is in
the operating
position.
Make
sure
that the blade assembly
is
aligned and
seated on the blade adapter flanges.
See
Fig.
7-1
inset.
6.
Place
flat washer on
the
blade.
7.
Replace hex
bolt
and
tighten with
a
torque
of 38 fti lb
(52 Nm)
Minimum to
50
ftllb
(68
Nm) Maximum.
To
ensure
safe
operation of
your
mower,
periodically
check the
blade,bolt for correct torque.
0ff-Season Storage
The
following
steps
should
be
taken
to prepare your lawn mower
for
storage.
.
Clean
and lubricate mower thoroughly
as
described
in
the
lubrication instructions.
.
Coat mower's
cutting blade
with
chassis grease
to prevent
ru sti
n
g.
.
Refer
to engine manual
for
correct
engine
storage
i
nstructions.
.
Do
not
use a
pressure washer or garden
hose
to
clean
your
unit.
.
Store
mower
in
a
dry, clean area.
Do not store next
to
corrosive materials, such
as
fertilizer.
When
storing
any
type of
power equipment
in a
poorly
ventilated or
metal
storage shed, care
should
be
taken
to
rust-proof the equipment. Using
a
light
oil or silicone, coat
the
equipment, especially cables and all
moving parts
of
your
lawn
mower before storage.
3
4.
<--
Nut
Flat
washer------>
<-
Blade Disc
<-
Bolt
Swing Blade
-------->
Wave Washer
->
H
Flat Washer
Bolt
ly
Ad
14
E
U