Troy-Bilt TB272 BC Operator's Manual page 16

ADJUSTING THE TRIMMING LINE LENGTH
This unit is equipped with a bump head. Trimming line can be
released from the cutting head without stopping the engine.
To release more line, lightly tap the bump knob on the ground (Fig. 23)
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.
NOTE: 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 fully extended. Line release
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.
TIPS FOR BEST RESULTS (AS A TRIMMER)
• For most operations, cut from side to side.
• To direct clippings away from the operator, tilt the cutting head
slightly down to the right; cut from left to right whenever possible.
• Cut tall grass (over 8 inches (20cm)) from the top down by
lowering the cutting head onto the grass.
• Cut with the tip of the trimming line.
• Cut in small increments. Move slowly. Do not force the unit.
• Do not trim wet grass or weeds.
NOTE: Some line breakage will occur from:
• Entanglement with foreign matter
• Normal line fatigue
• Attempting to cut thick vegetation
• Forcing the line into objects such as walls or fence posts
DECORATIVE TRIMMING (AS A TRIMMER)
When trimming around trees, posts, fences, etc., rotate the whole
unit so that the cutting head is at a 30° angle to the ground (Fig. 24).
Bump Knob
16
Fig. 23
Fig. 24