MTD 450 Serie Manual Del Operador página 15

Service
7
Blade Care
Chipper Blades
WARNING; Always stop engine, disconnect spark
plug, and ground against engine before cleaning,
lubricating or doing any kind of maintenance on
your machine.
1.
2.
3.
Disconnect the spark plug wire and ground against the
engine.
Remove the flail screen as instructed in the previous
section.
Remove the chipper chute by removing three hex nuts and
washers. See Fig. 7-1A.
//
/
iJ
/
/ /
/
/
/
/
Figure 7-1
4.
Remove the chipper chute support brace (Model Series
460) from the frame by removing the hex bolts. See Fig.
7-1B.
5. Rotate impeller assembly by hand until you locate one of
two chipper blades in the chipper chute opening.
6. Remove the blade by removing the internal hex screws,
lock washers, and hex nuts which secure it to the impeller.
See Fig. 7-2. Retain the hardware.
f
/
/
7.
8.
Figure 7-2
NOTE: Use a 3/16" hex key (Allen) wrench on the outside of
the blade and a 1/2" box (or socket) wrench on the inside of
the impeller. Hold the Allen wrench stationary and rotate
the box (or socket) wrench to loosen the nut.
Install a replacement blade (Part No. 781-0490) with the
hardware removed earlier or sharpen.
IMPORTANT:When sharpening the blade, protect hands by
using gloves. Follow the original angle of grind and make
sure to remove an equal amount from each blade.
To replace the other blade, rotate the impeller to expose
the second blade and repeat the steps above.
NOTE:Make certain blades are reassembled with the sharp
edge facing upward. Torque hardware to 250 - 300 in. Ibs.
_k WARNING: The impeller's chipper blades and
shredder blade are sharp. Wear leather work gloves
to protect your hands.
15