Troy-Bilt CORE TB4200 Operator's Manual page 12

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 motor.
To release more line, lightly tap the bump knob on the ground (Fig.
10) while operating the unit at high speed. For best results, tap the
bump knob on bare ground or hard soil.
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.
CAUTION:
Do not remove or alter the line cutting blade
assembly. This may lead to serious personal injury or
damage to the unit.
TIPS FOR BEST RESULTS
• To direct clippings away from the operator, tilt the cutting head
slightly down to the left; cut from right to left whenever possible.
• 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
• Remove the battery from the unit when it is not in use.
DECORATIVE TRIMMING
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. 11).
12
Bump Knob
Fig. 10
Fig. 11