Yard-Man LT31 - Manual (Page 10)

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.
CAUTION: Do not remove or alter the line
cutting blade assembly. Excessive line length
will make the unit overheat. This may lead to
serious personal injury or damage to the unit.
Some line breakage will occur from:
• Entanglement with foreign matter
• Normal line fatigue
• Attempting to cut thick, stalky weeds
• Forcing the line into objects like walls or fence posts
TIPS FOR BEST TRIMMING RESULTS
• Keep the cutting head parallel to the ground.
• Do not force the cutting head. Allow the tip of the
line to do the cutting, especially along walls. Cutting
with more than the tip will reduce cutting
efficiency and may overload the engine.
• Cut grass over 200 mm (8 inches) by working from
top to bottom in small increments to avoid
premature line wear or engine drag.
• Cut from left to right whenever possible. Cutting to
the right improves the unit's cutting efficiency.
Clippings are thrown away from the operator.
• Slowly move the trimmer into and out of the cutting
area at the desired height. Move either in a forward-
backward or side-to-side motion. Cutting shorter
lengths produces the best results.
• Trim only when grass and weeds are dry.
• The life of your cutting line is dependent upon:
•
Following the previous trimming techniques
• What vegetation is being cut
• Where vegetation is cut
10
FIGURE 8
FIGURE 9
HOLDING THE TRIMMER
WARNING: Always wear eye, hearing, foot
and body protection to reduce the risk of injury
when operating this unit.
Before using the unit, stand in the operating position,
Figure 8. Check for the following:
• The operator is wearing eye protection and proper
clothing
• With a slightly-bent right arm, the operator’s hand is
holding the shaft grip
• The operator’s left arm is straight, his hand holding
the D-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
ADJUSTING TRIMMING LINE LENGTH
The Bump Head™ cutting head allows you to release
trimming line without stopping the engine. To release
more line, lightly tap the cutting head on the ground
while operating the trimmer at high speed, Figure 9.
NOTE: Always keep the trimming line fully extended.
Line release becomes more difficult as cutting
line becomes shorter.
Each time the head is bumped, about 25.4 mm (1 inch) of
trimming line releases. A blade in the cutting head guard will
cut the line to the proper length if excess line is released.
FIGURE 10
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, etc.
Rotate the whole unit so that the cutting head is at a
30° angle to the ground, Figure 10.