Operating Instructions - MTD Yard Machines Y780 Manual Del Operador

HOLDING THE TRIMMER
WARNING:
Always wear eye, hearing, foot and
body protection to reduce the risk of injury when
operating this unit.
Before operating the unit, stand
in the operating position (Fig. 18).
Check for the following:
• The operator is wearing eye
protection and proper
clothing
• With a straight right arm, the
operator's right hand is
holding the shaft grip
• The operator's left arm is
slightly-bent, the left hand
holding the handle
• The unit is at waist level
• The cutting attachment is
parallel to the ground and
easily contacts the grass
without the need to bend over
Once you are in the operating position, hook the shoulder strap
to the unit.
ADJUSTING TRIMMING LINE LENGTH
The Bump Head™ cutting attachment allows you to release
trimming line without stopping the engine. To release more line,
lightly tap the cutting attachment on the ground (Fig. 19) while
operating the trimmer at high speed.
Fig. 19
NOTE: Always keep the trimming line fully extended. Line
release becomes more difficult as the cutting line
becomes shorter.
Each time the head is bumped, about 25.4 mm (1 inch) of
trimming line is released. A blade in the cutting attachment
shield will cut the line to the proper length if excess line is
released.
CAUTION:
Do not remove or alter the line cutting
blade assembly. Excessive line length will make the
clutch overheat. This may lead to serious personal
injury or damage to the unit.
For best results, tap the Bump Head™ on bare ground or hard
soil. If line release is attempted in tall grass, the engine may
stall. Always keep the trimming line fully extended. Line release
becomes more difficult as the cutting line becomes shorter.
NOTE: Do not rest the Bump Head™ on the ground
while the unit is running.

OPERATING INSTRUCTIONS

Some line breakage will occur from:
• Entanglement with foreign matter
• Normal line fatigue
• Attempting to cut thick, stalky weeds
• Forcing the line into objects such as walls or fence posts
TIPS FOR BEST TRIMMING RESULTS
• For best trimming results, operate unit at full throttle.
• Keep the cutting attachment parallel to the ground.
• Do not force the cutting attachment. Allow the tip of the
• Cut grass over 203mm (8 inches) by working from top to
• Cut from left to right whenever possible. Cutting to the
• Slowly move the trimmer into and out of the cutting area at
Fig. 18
• Trim only when grass and weeds are dry.
• The life of your cutting line is dependent upon:
• Proper adherence of trimming techniques (explained
• What vegetation is cut
• Where vegetation is cut
For example, the line will wear faster when trimming against a
foundation wall as opposed to trimming around a tree.
DECORATIVE TRIMMING
Decorative trimming is accomplished by removing all
vegetation around trees, posts, fences and more.
Rotate the whole unit so that the cutting attachment is at a 30°
angle to the ground (Fig. 20).
USING THE CUTTING BLADE
Before operating the unit with the cutting blade, stand in the
operating position (Fig. 21). Refer to Holding the Trimmer.
8
line to do the cutting, especially along walls. Cutting with
more than the tip will reduce cutting efficiency and may
overload the engine.
bottom in small increments to avoid premature line wear or
engine drag.
right improves the unit's cutting efficiency. Clippings are
thrown away from the operator.
the desired height. Move either in a forward-backward or
side-to-side motion. Cutting shorter lengths produces the
best results.
above)
Fig. 20
WARNING:
Always wear eye, hearing, foot, body
protection and the shoulder strap to reduce the risk
of injury when operating this unit.
WARNING:
Do not use the cutting blade for
edging or as an edger. Severe personal injury to
yourself or others can result.