MTD 450 Serie Manual Del Operador página 7

Service
Maintenance
General Recommendations
• Always observe safety rules when performing
any maintenance.
• The warranty on this chipper shredder does
not cover items that have been subjected to
operator abuse or negligence. To receive full
value from warranty, operator must maintain
the equipment as instructed here.
• Changing of engine-governed speed will void
engine warranty.
• All adjustments should be checked at least
once each season.
• Periodically check all fasteners and make sure
these are tight.
WARNING:
Always stop engine,
disconnect spark plug, and ground
against engine before, cleaning,
lubricating, or performing any type of
maintenance on your machine.
Lubrication
1. Lubricate the release rod and spring with light
oil once a season. See Figure 4-1.
2. Lubricate the pivot points on the hopper with
light oil once a season.
3. Lubricate the pivot points on the chute
deflector with light oil once a season.
4. Follow the separate engine manual packed
with your unit for engine lubrication
instructions.
Model Series 460
Figure 4-1
Equipment Care
• Clean the chipper shredder thoroughly after
each use.
• Wash bag periodically with water. Allow to dry
thoroughly in shade.
• If the discharge area becomes clogged, remove
flail screen and clean as instructed below.
NOTE:
Cleaning with a forceful spray of water
is not recommended as it could contaminate
the fuel system.
Engine Care
Refer to the Maintenance section of the Engine
Owner/ Operator manual packed with your unit.
Read and follow instructions carefully.
• Check engine oil level before each use as
instructed in the separate engine manual.
• Clean or replace air cleaner every 25 hours
under normal conditions. Clean every few hours
under extremely dusty conditions. To service
the air cleaner, refer to the engine manual.
• The spark plug should be cleaned and the gap
reset once a season. Check engine manual for
correct plug type and gap specifications.
• Clean engine regularly with a cloth or brush.
Keep the top of the engine clean to permit
proper air circulation. Remove all grass, dirt,
and combustible debris from muffler area.
Removing the Flail Screen
WARNING:
blade and chipper blades are sharp. Wear
leather work gloves to protect your hands
when cleaning out the reduction chamber.
If the discharge area becomes clogged, remove the
flail screen and clean area as follows:
1. Stop engine and make certain the chipper
shredder has come to a complete stop.
WARNING:
surrounding area will be hot if the
engine has been running. Use caution
and protect your hands if working near
the muffler.
2. Disconnect spark plug wire from spark plug
and ground against the engine.
3. Remove the bag and two wing knobs (a) on
each side of the chute deflector. See Figure
4-2.
4. Lift the chute deflector up to keep it out of the
way. See Figure 4-2.
5. Remove the two hairpin clips (b) from each
clevis pin (c) which extend through the
housing and remove pins. See Figure 4-2.
6. Remove the flail screen from inside the
housing and clean the screen by scraping or
washing with water.
7. Reinstall the screen, making certain to
reassemble the flail screen with the curve side
down.
8. Reattach the chute deflector with the
hardware removed in Steps 3 and 5 and
Shown
connect the bag to unit.
(b)
The impeller's shredder
The muffler and
(c)
(c)
(a)
(a)
(b)
Model Series 460 Shown
Figure 4-2
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. Disconnect the spark plug wire and ground
against the engine.
2. Remove the flail screen as instructed in the
Maintenance & Adjustments section.
3. Remove the chipper chute by removing three
hex nuts (a) and washers (b). See Figure 4-3
inset A.
Model Series 460 Shown
B
(c) (a)
(c)
Figure 4-3
4. Remove the chipper chute support brace
(Model Series 460) from the frame by
removing the hex bolts (c).
See Figure 4-3 inset B.
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 (a), lock washers (b), and hex nuts
(c) which secure it to the impeller. See Figure
4-4. Retain the hardware.
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.
(c)
(b)
(b)
(a)
(a)
Figure 4-4
4
A
(b)
(c)
7