Echo 73040 Owners Manual v.1 - Manual (Page 10)

8
Service & Maintenance
1. Feed the cutting string through the second hole on either
end of the trimmer head leaving approximately 8 inches
for the cutting surface. Total recommended string length
is 20-1/2 inches.
2. Continue by weaving the cutting string through the first
hole directly beside the second hole used in Step 1. Pull
the cutting string tight.
3. Loop the cutting string back and feed through the first
hole on the opposite end of the trimmer head.
4. Feed through the remaining second hole and pull the
cutting string tight. The cutting strings in the middle two
holes should be the same length. If the length differs, cut
to an even length.
When completed, the trimmer head should resemble Figure
11.
Cutting String Replacement
WARNING: Before inspecting or servicing
any part of the machine, disconnect the
spark plug wire from the spark plug and
make sure all moving parts have come to a
complete stop.
Figure 11
Cutting string is available in two thicknesses, .130 mil
(standard) and .155 mil (heavy duty). The type of string
selected is dependent on the conditions and material being cut.
The cutting string can also be wrapped in a variety of ways.
Refer to Figure 12 and Figure 13 for two examples.
Heavier string than .155 mil can be use by making the holes
in the trimmer head larger. The decision to drill the holes
bigger shortens the life of .130 mil and .155 mil string if used
again.
Figure 13
Figure 12
The wrapping method and cutting string thickness chosen is
ultimately based on what is determined the best performers for
the operator.
9/16” Wrench
Optional
Beaver Blade
Trimmer Disk
Trimmer Head
Figure 10