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13
OPERATION
Fig. 13
ADJUSTING THE TRIMMING LINE LENGTH (BUMP HEAD)
The cutting head can be used as a bump head or as a fixed-line
head. When used as a bump head, trimming line can be released
from the cutting head without stopping the engine. Before doing so,
make sure the cutting head is loaded with line. Refer to Replacing
the Trimming Line (Bump Head) in the Maintenance section.
To release more line, lightly tap t
he bump knob on the ground (Fig.
14) while operating the unit at high speed. For best results, tap the
bump knob on bare ground or hard soil. Attempting to release line in
tall grass may stall the engine.
N
OTE: Do not rest the cutting head on the ground while the unit is
running.
Each time the bump knob is tapped, about 1 inch (25.4 mm) of
trimming line is released.
NOTE: Always keep the trimming line full
y extended. Line re
lease
becomes more difficult when the cutting line gets shorter.
A blade in the cutting head shield will cut the line to the proper
length if any excess line is released.
WARNING:
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.
HOLDING THE UNIT
• Stand in the operating position (Fig. 13). Stand up straight. Do
not bend over.
• Keep feet apart and firmly planted.
• Hold the shaft grip with the right hand. Keep the right arm
slightly bent.
• Hold the handle with the left hand. Keep the left arm straight.
• Hold the unit at waist level.
• Position the cutting head a few inches above the ground.
WARNING:
Always wear eye, hearing, hand, foot and
body protection to reduce the risk of injury when operating
this unit.
WARNING:
To prevent serious personal injury, avoid arm
contact with the engine while operating the unit. The
engine may be extremely hot.
Fig. 14
Bump Knob
TIPS FOR BEST RESULTS
• MODEL NO. 316.74082*: To direct clippings away from the
operator, tilt the cutting head slightly down to the left; cut from
right to left whenever possible.
• MODEL NO. 316.74089*: To direct clippings away from the
operator, tilt the cutting head slightly down to the right; cut from
left to right whenever possible.
• Do not trim wet grass or weeds.
NOTE: Some line breakage will occur fro
m:
• E
ntanglement with foreign matter
• Normal line fatigue
• Attempting to cut thick vegetation
• Forcing the line into objects such as walls or fence posts
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