6
Maintaining
Your Lawn
Tractor
Battery Failures
Some common causes for battery failure are:
• incorrect initial activation
• undercharging
• overcharging
• freezing
• corroded connections
These failures are NOT covered by your tractor’s
warranty.
Fuse
One 20 AMP fuse is installed in your tractor’s wiring
harness to protect the tractor’s electrical system from
damage caused by excessive amperage.
If the electrical system does not function, or your tractor’s
engine will not crank, first check to be certain that the
fuse has not blown. It can be found under the hood
mounted behind the dash panel on the right side.
WARNING: Always use a fuse with the
same amperage capacity for replace-
ment.
Figure 6-6
Cutting Blades
WARNING: Be sure to shut the engine
off, remove ignition key, disconnect the
spark plug wire(s) and ground against
the engine to prevent unintended
starting before removing the cutting
blade(s) for sharpening or replace-
ment. Protect your hands by using
heavy gloves or a rag to grasp the
cutting blade.
WARNING
Be sure to shut
the engine off,
remove ignition key,
disconnect the spark
plug wire(s) and
ground against the
engine to prevent
unintended starting
before removing the
belt.
WARNING: Periodically inspect the
blade spindles for cracks or damage,
especially if you strike a foreign object.
Replace immediately if damaged.
�INCH
The blades may be removed as follows.
Figure 6-7
1.
2.
3.
4.
Remove the deck from beneath the tractor, (refer to
Cutting Deck Removal on page 23) then gently flip
the deck over to expose its underside.
Place a block of wood between the center deck hous-
ing baffle and the cutting blade to act as a stabilizer.
See Figure 6-6.
Use a 15/16” wrench to remove the hex flange nut
that secures the blade to the spindle assembly. See
Figure 6-6.
To properly sharpen the cutting blades, remove equal
amounts of metal from both ends of the blades along
the cutting edges, parallel to the trailing edge, at a
25° to 30° angle.
•
•
A poorly balanced blade will cause excessive
vibration and may cause damage to the tractor and
result in personal injury. The blade can be tested by
Avoid the possibility
of a pinching injury.
balancing it on a round shaft screwdriver. Grind metal Do not place your
from the heavy side until it balances evenly.
fingers on the idler
spring or between the
belt and a pulley while
removing the belt.
When replacing the blade, be sure to install the blade
with the side of the blade marked ‘‘Bottom’’ (or with
a part number stamped in it) facing the ground when
the mower is in the operating position.
IMPORTANT: Use a torque wrench to tighten the blade
spindle hex flange nut to between 70 foot-pounds and 90
foot-pounds.
IMPORTANT: If the cutting edge of the blade has already
been sharpened to within 1 5/8” from the edge, or if any
metal separation is present, replace the blades with new
ones. See Figure 6-7.
•
It is important that each cutting blade edge be ground
equally to maintain proper blade balance.
23
| Categories | Lawn Mower Manual, MTD Lawn Mower Manuals |
|---|---|
| Tags | MTD 760, MTD 779 |
| Download File |
|
| Document Type | Owner's Manual |
| Language | English |
| Product Brand | MTD, Lawn Mower |
| Product Type | Walk Behind Mower |
| Document File Type | |
| Publisher | mtdproducts.com |
| Wikipedia's Page | MTD Products |
| Copyright | Attribution Non-commercial |
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