MTD 450 Serie Manual Del Operador página 8

7. Install a replacement blade (see Replacement
Parts Section) with the hardware removed in
Step 6 or sharpen and reinstall.
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.
Shredder 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 (a) and flat
washers (b) from the weld studs on the flail
housing. See Figure 4-5 inset A. Retain the
hardware.
5. Carefully separate the hopper assembly from
the impeller assembly and remove the support
plate. See Figure 4-5.
NOTE:
When reassembling the support plate,
make certain the embossed tab faces inward
towards the impeller.
Model Series 460 Shown
Figure 4-5
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 S 4 — S
ection ervice
8. Remove the two internal hex screws (a), lock
washers (b), and hex lock nuts (c) which secure
the shredder blade to the impeller. See Figure
4-6.
(a)
(f)
(d)
(e)
9. Remove the hex bolt (d), lock washer (e), and
flat washer (f) to completely free shredder
blade. See Figure 4-6.
IMPORTANT:
shredder blade, tighten center bolt to
between 550 and 700 in.-lbs. and the two
outside bolts to between 250 and 350 in.-lbs.
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:
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.
(b)
(a)
A
(b)
(c)
(b)
(c)
(a)
Figure 4-6
When reassembling the
When sharpening the blade,
Off-Season Storage
• When storing the chipper shredder in an
unventilated or metal storage shed, care
should be taken to rustproof the non-painted
surfaces. Using a light oil or silicone, coat the
equipment, especially any springs, bearings,
and cables.
• Remove all dirt from exterior of engine and
equipment.
• Follow lubrication recommendations.
• Refer to engine manual for correct engine
storage instructions.
• Store equipment in a clean, dry area. Do not
store in an area where equipment is present
that may use a pilot light or has a component
that can create a spark.