DR Power Self-Propelled 6.75 Pro-XL (September 2010 - April 2013) - Manual (Page 16)

16 DR ® TRIMMER/MOWER
Cord Tips
We ship two (2) thicknesses of Cutting Cord with your DR TRIMMER/MOWER.
The Cords are Blue (175-mil) and Green (155-mil). Because conditions and vegetation vary so much, you should experiment with
Cord weights (diameters) to discover what works best for your particular mowing and trimming situations. Here are a few things
to keep in mind:

If you buy Cutting Cord in rolls, cut it in 23" lengths.
 Cord life depends on trimming conditions. Replace Cords when they become broken or frayed.

The smallest diameter Cord capable of cutting the material at hand combined with the fastest Engine speed usually provides
the best grass trimming performance. When you need more power for thicker growth such as berry canes, brambles, thistles,
or ragweed, you may want to use the 175-mil Cord in combination with the highest Engine speed.

Ease the ends of the Cord into heavy growth and move slowly through thick growth. If there are woody weeds in the material
you are cutting, the cutting Cords may wrap around the stalks they cannot cut, and pull away from the Trimmer Head.
 Please note that installing more than two (2) Cords at a time does not improve trimming performance, in fact, it can lessen it.
Adding additional Cords creates drag on the Trimmer Head, robs the Engine of power, and may cause wrapping. Installing two
(2) Cords, 180 degrees apart, on the same line plate, is the best method for optimal trimming performance.
 When replacing Cords, do it one at a time and use the old Cord to mark the position for the new Cord that you are replacing.

If the Cord breaks off flush at the Line Plate, use the new Cord to push out the old Cord.
 Storing the Cord in a plastic bag with a damp sponge or cloth will help keep it pliable. You can also soak your Cutting Cord in a
bucket of room temperature water for a few days before use to make it more pliable.
Adjusting the Cutting Height
Adjusting the Cutting Height is easy. Cutting heights range in 1/2-inch
increments from 1-1/2 inches when using the bottom Line Plate, to
approximately 4 inches when using the top Line Plate (Sprint and Pro models)
(Figure 21) and approximately 5 inches when using the top Line Plate (Pro-XL
Self-Propelled model).
Install the Cutting Cords in the Line Plate that gives you the desired cutting
height.
The Mow-Ball ® Support
Allow the front end of the machine to rest lightly on the Mow-Ball Support as
you are trimming. The Mow-Ball Support should glide on the ground as you
maneuver the machine. To achieve the best and smoothest cut, do not lift up
on the Handlebar while operating your DR TRIMMER/MOWER. Lifting the
Handlebar will force weight down on the Mow-Ball Support. This uses more
energy, slows the cutting, and produces an unsatisfactory cut. Ideally, the Mow-
Ball Support should lightly rest on the ground while the Wheels balance most
of the weight of the machine (Figure 22).
When using the PTA ® feature, install the cutting cords in one of the four
bottom line plates only.
Figure 21
Figure 22