DeWalt DCST991 User Manual

ENGLISH
8
4
12
Fig. E
Switching Trimmer On and Off (Fig. A)
To turn the appliance on, squeeze the lock-off lever
2
and
then the variable speed trigger
1
. To turn the appliance off,
release the variable speed trigger and the lock-offlever.

WARNING: Never attempt to lock the
trigger in the onposition.
Speed Control Switch (Fig. A)
This string trimmer gives you the choice to operate
at a more efficient speed to extend the runtime for
larger jobs, or accelerate the trimmer speed for high-
performancecutting.
To extend runtime, push the speed control switch
3
forward toward the auxillary handle
4
into the "LO"
position. This mode is best for larger projects that require
more time tocomplete.
To accelerate the trimmer, pull the speed control switch
back toward the battery housing
9
into the "HI" position.
This mode is best to cut through heavier growth and for
applications that need higherRPM.
NOTE: When in "HI" mode, runtime will be decreased as
compared to when trimmer is in "LO"mode.
Trimming (Fig. F, G)
With the trimmer on, angle it and swing side to side as
shown in FigureF.
Maintain a minimum distance of 24 inches (610 mm)
between the guard and your feet as shown in FigureG.
Fig. F
Fig. G
Minimum
24 Inches (610 mm)

WARNING: Keep the rotating string
roughly parallel with the ground (tilted no more than
30 degrees). This trimmer is not an edger. DO NOT
TILT the trimmer so that the string is spinning near
a right angle to the ground. Flying debris can cause
seriousinjury.
Bump Feed Trimmer Line Feed
Your trimmer uses 0.080 inches (2.032 mm) diameter nylon
line. Cutting line will wear faster and require more feeding
if the cutting is done along sidewalks or other abrasive
surfaces or heavier weeds are beingcut.
As you use the trimmer, the string will get shorter due
to wear. Gently bump the trimmer on the ground while
running at normal speed and the line willfeed.
NOTE: Extending nylon line beyond the 15inch (381mm)
swath will negatively affect performance, runtime, and the
life of the trimmer due to potential of damaging motor.
Doing so may void thewarranty.
Helpful Cutting Tips
• Use the tip of the string to do the cutting; do not force
string head into uncutgrass.
• Wire and picket fences cause extra string wear, even
breakage. Stone and brick walls, curbs, and wood may
wear stringrapidly.
• Do not allow spool cap to drag on ground or
othersurfaces.
• In long growth, cut from the top down and do not exceed
12 inches (304.8 mm)high.
• Keep trimmer tilted toward the area being cut; this is the
best cuttingarea.
• The trimmer cuts when passing the unit from the left to
right. This will avoid throwing debris at theoperator.
• Avoid trees and shrubs. Tree bark, wood moldings, siding,
and fence posts can easily be damaged by thestring.
Reloading the Cutting Line (Fig. H, I)

WARNING: To reduce the risk of
serious personal injury, turn unit off and remove
the battery pack. An accidental start-up can
causeinjury.

CAUTION: Use only
DeWALT
replacement
spools and line. Using any other manufacturer's line
can reduce performance, damage the trimmer or

DeWalt DCST991 Specifications

General

Brand	DeWalt
Model	DCST991
Category	Trimmer
Language	English