MTD 450 Series - Manual (Page 13)

13
5
WARNING
Figure 5-3
Figure 5-4
The impeller’s
chipper blades and
shredder blade are
sharp. Wear leather
work gloves to
protect your hands.
Maintaining
Your Chipper
Shredder
IMPORTANT
Make certain chipper
blades are reassem-
bled with the sharp
edge facing upward.
Torque hardware to
250 - 300 in. lbs.
6. Remove the blade by removing the internal hex
screws, lock washers, and hex nuts which secure it to
the impeller. Retain the hardware. See Figure 5-3.
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.
7. 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.
8. 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. lbs.
WARNING: The impeller’s chipper
blades and shredder blade are sharp.
Wear leather work gloves to protect your
hands.
Sharpening Or Replacing The Shred-
der Blade
1. Stop the engine and make certain that all moving
parts have come to a complete stop.
2. Disconnect the spark plug wire and ground against the
engine.
3. Lower the hopper assembly and block up the housing.
4. Remove the six hex lock nuts and flat washers
from the weld studs on the flail housing. Retain the
hardware.
5. Carefully separate the hopper assembly from the
impeller assembly and remove the support plate.
NOTE: When reassembling the support plate, make
certain the embossed tab faces inward towards the
impeller.
6. Remove the two wing knobs and cupped washers that
secure the chute deflector and raise the chute.
7. Insert a 1/2” or 3/4” diameter pipe through the flail
screen into the impeller to keep it from turning or
remove the flail screen and insert a piece of wood into
the chute opening.
8. a. Remove the two internal hex screws, lock washers,
and hex lock nuts which secure the shredder blade
to the impeller.
b. Remove the hex bolt, lock washer, and flat washer
to completely free shredder blade. See Figure 5-4.
NOTE: Use a 3/16” hex key (Allen) wrench on the
outside of the shredder blade and a 1/2” box (or socket)
wrench on the inside of the shredder blade. Hold the
Allen wrench stationary and rotate the box (or socket)
wrench to loosen the nut. Use caution when removing
the blade to avoid contacting the weld studs on housing.
IMPORTANT: When sharpening the blade, follow
the original angle of grind as a guide. It is extremely
important that each cutting edge receives an equal
amount of grinding to prevent an unbalanced blade.
An unbalanced blade will cause excessive vibration
when rotating at high speeds and may cause damage
to the unit. The blade can be tested by balancing it on a
screwdriver or nail. Remove metal from the heavy side
until it is balanced evenly.
Storing Your Chipper Shredder
The following steps should be taken to prepare your
chipper shredder for storage.
1. Clean the equipment thoroughly.
2. Wipe equipment with an oiled rag to prevent rust.
3. Refer to engine manual for correct engine storage
instructions.
4. Store unit in a clean, dry area. Do not store next to
corrosive materials such as fertilizer.
IMPORTANT
When reassembling the
shredder blade, tighten
center bolt to between
550 and 700 in.-lbs.
and the two out bolts to
between 250 and 350
in.-lbs.
A
A
B