Blade Service; How To Sharpen The Blade - Murray 20-inch Push Instruction Book

BLADE SERVICE

WARNING: Before you inspect
the blade or the blade adapter,
disconnect the wire to the spark
plug. If the blade hits an object, stop the
engine. Disconnect the wire to the spark
plug. Check the unit for damage.
Frequently check the blade for wear or dam-
age such as cracks. Frequently check the bolt
that holds the blade. Keep the bolt tight. If the
blade hits an object, stop the engine. Discon-
nect the wire to the spark plug. Check the
blade adapter for damage. Check for a bent or
damaged blade, a badly worn blade, or other
damage. Before you operate the unit, dam-
aged parts must be replaced with factory re-
placement parts. For safety, replace the blade
every two years. Keep a sharp edge on the
blade. A blade that is not sharp will cause the
ends of the grass to become brown. Remove
the blade as follows.
HOW TO REMOVE THE BLADE
WARNING: Before you remove
the blade, disconnect the wire
to the spark plug. The blade has
sharp edges. When you hold the blade,
use gloves or cloth material to protect
your hands.
1. Drain the fuel tank.
2. Lift the side of the mower that has the
muffler or spark plug.
3. Use a piece of wood to keep the blade
from rotating.
4. Remove the bolt that holds the blade.
5. Check the blade according to the "Blade
Service" instructions. Replace a badly
worn or damaged blade with a factory re-
placement blade.

HOW TO SHARPEN THE BLADE

WARNING: Vibration is the re-
sult if the blade is not correctly
balanced. A blade that is dam-
aged with cracks can break and cause an
accident.
1. Sharpen the blade two times a year or ev-
ery 25 hours.
2. If the blade is on the unit, do not sharpen.
Remove the blade according to the in-
F-050401L
MAINTENANCE
6. Mount the blade with the curved edges to-
7. Fasten the blade with the original wash-
8. Tighten the bolt that holds the blade to a
Blade Adapter
Ï Ï Ï Ï Ï Ï
3. Clean the blade with a brush, soap, and
4. Sharpen the blade with a file. Make sure
18
ward the housing. If the blade is upside
down, the blade will not cut correctly and
can cause an accident.
ers and bolt. Make sure the outside rims
of the Belleville washers are toward the
blade (Figure 14).
torque of 30 foot pounds.
WARNING: Always keep the bolt
that holds the blade tight. A loose
bolt or blade can cause an acci-
dent.
Blade Adapter
Ï Ï Ï Ï
Ì Ì Ì Ì
Ì Ì Ì Ì Ï Ï
Ì Ì Ï Ï Ï Ï Ñ Ì Ì
Flat Washer
Bolt
structions in "How To Remove The Blade".
water. Check the blade. Look for cracks,
nicks, or other damage. Replace a blade
that is badly worn, bent, or damaged with
a factory replacement blade.
you keep the original beveled cutting edge
(Figure 15).
(Continued following page)
Blade
Belleville
Washer
Washer
Bolt
Mulching Blade
Belleville Washer
Figure 14