Replace The Cutting Line; Assemble The Trimmer Head; Remove The Trimmer Head; Replace The Bump Knob - GreenWorks STF457 Operator's Manual

8. Push the spool cover until it clicks into position.
5.4

REPLACE THE CUTTING LINE

Figure 14 - 16.
NOTE
Remove the remaining cutting line on the spool.
NOTE
Use only with the nylon cutting line of 2 mm diameter.
1. Cut a piece of cutting line approximately 3m long.
2. Bend the line at the midpoint and hook the loop into
the slot in the center rim of the spool. Make sure
that the line snaps into position in the slot.
3. With your finger between the lines, wind the lines
equally and tightly around the spool in the indicated
direction.
4. Put the lines in the guide slots.
5. Do not wind the lines beyond the edge of the spool.
5.5

ASSEMBLE THE TRIMMER HEAD

Figure 21.
1. Put the spacer correctly on the shaft.
2. Attach the inner ring-nut to inner cup in the indicated
direction.
3. Make sure that the grooves of the inner ring-nut
align perfectly with those of the angle transmission.
4. Put the wrench in the specified angle transmission
hole.
5. Turn the trimmer head and push the wrench until
the wrench engages the inner ring-nut hole, blocking
rotation.
6. Assemble the trimmer head.
7. Turn the trimmer head counterclockwise to tighten it.
8. Remove the wrench.
IMPORTANT
You must install the cut-off blade when you use the
trimmer head.
5.6

REMOVE THE TRIMMER HEAD

Figure 21.
1. Put the wrench in the specified angle transmission
hole.
2. Turn the trimmer head and push the wrench until
the wrench engages the inner ring-nut hole, blocking
rotation.
3. Turn the trimmer head clockwise to loosen it. Do not
remove the spacer from the shaft.
English
5.7

REPLACE THE BUMP KNOB

Figure 13.
1. Simultaneously press the tabs on the sides of the
trimmer head.
2. Pull and remove the spool cover.
3. Remove the spool.
4. Hold the bump knob and pry it out with a metal rod
(not provided).
5. Put the new bump knob into the spool housing.
5.8

ASSEMBLE THE BRUSH CUTTER

Figure 22 - 23.
Wear gloves and be careful with sharp edges.
Apply the guard to the blade.
1. Put the spacer correctly on the shaft.
2. Attach the inner ring-nut to inner cup in the indicated
direction.
3. Make sure that the grooves of the inner ring-nut
align perfectly with those of the angle transmission.
4. Attach the blade and outer ring-nut with the flat part
facing the blade.
5. Attach the outer cup without tightening the nut.
6. Put the wrench in the specified angle transmission
hole.
7. Turn the blade and push the wrench until the blade
fits in the inner ring-nut hole, blocking rotation.
8. Tighten the nut counterclockwise with a 19 mm or
3/4 in. wrench (44/58 Nm).
5.9

REMOVE THE BRUSH CUTTER

Figure 22 - 23.
Apply the guard to the blade.
1. Put the wrench in the specified angle transmission
hole.
2. Trun the blade and push the wrench until the wrench
engages the inner ring-nut hole, blocking rotation.
3. Loosen the nut clockwise and remove the outer cup.
4. Remove the outer ring-nut, blade, inner cup and
inner ring-nut. Do not remove the spacer from the
shaft.
7
WARNING
WARNING
WARNING
EN