Operation Manual

16
ADJUSTMENT OF LOW-SPEED REVOLUTIONS (IDLING)
The cutter blade or the nylon cutting head should not rotate when the control
lever is fully released. If necessary, adjust the idling rpm using the idling
adjustment screw.
Checking the Idling speed
– The idling speed should be set to 3,000 min
-1
.
If necessary, adjust the idling speed using the idling screw (the blade or the
nylon cutting head must not turn when the engine is idling).
Tightening the idling screw (1) increases the engine revolutions, whereas
loosening the idling screw reduces the engine revolutions.
CAUTION: The cutting tools listed below must only be resharpened by an
authorized facility. Manual resharpening will result in imbalances of
the cutting tool, which will cause vibrations and damage to the
equipment.
– cutter blade (star blade (4 teeth), eddy blade (8 teeth))
A professional resharpening and balancing service is provided by Authorized
Service Agents.
NOTE: To increase the service life of the cutter blade (star blade, eddy blade)
the blade may be turned over to allow both cutting edges to wear.
NYLON CUTTING HEAD
The nylon cutting head is a dual string trimmer head capable of both automatic
and bump & feed mechanisms.
The nylon cutting head will automatically feed out the proper length of nylon cord
by the changes in centrifugal force caused by increasing or decreasing rpms.
However, to cut soft grass more efficiently, bump the nylon cutting head against
the ground to feed out extra cord as shown in operation section.
Operation
– Increase the nylon cutting head speed to approx. 6,000 min
-1
.
Nylon cord will not feed out correctly at lower speeds (under 4,800 min
-1
).
– The most effective cutting area is shown by the shaded area in the diagram to
the right.
If the nylon cord does not feed out automatically, follow the instructions below:
1. Release the throttle lever so that the engine idles, and then squeeze the
throttle lever fully. Repeat this procedure until the nylon cord feeds out to the
proper length.
2. If the nylon cord is too short to feed out automatically using the procedure
above, bump the knob of the nylon cutting head against the ground to feed
out the nylon cord.
3. If the nylon cord does not feed out using procedure 2, rewind/replace the
nylon cord by following the procedures described under “Replacing the nylon
cord”.
Replacing the nylon cord
– Stop the engine.
– Press the housing latches inward to lift off the cover, then remove the spool.
Resharpening the cutting tool
(1)
Slow
High
Most effective cutting area
Knob
Idle speed Full speed
Cover
Latches
Press
Press
17
– Hook the center of new nylon cord into the notch in the center of the spool,
with one end of the cord extending about 80mm (3-1/8") more than the other.
Then wind both ends firmly around the spool in the direction of the head
rotation (left-hand direction indicated by LH and right-hand direction by RH on
the side of the spool).
– Wind all but about 100mm (3-15/16") of the cords around the spool, leaving
the ends temporarily hooked through the notch on the side of the spool.
– Mount the spool in the housing so that the grooves and protrusions on the
spool match up with those in the housing. Mount the spool so that the writing
on the spool is visible from above. Next, unhook the ends of the cords from
their temporary position, and feed the cords through the eyelets so that they
protrude from the housing.
– Align the protrusion on the underside of the cover with the slots of the eyelets.
Then push cover firmly onto the housing to secure it.
Servicing instructions
CAUTION: Before performing any type of maintenance work on the Brush
cutter, always switch off the motor and detach the plug cap from the
spark plug (see “checking the spark plug”).
Always wear protective gloves.
CAUTION: Never remove the recoil starter yourself. Doing so may cause an
accident. This procedure should only be performed by an Authorized
Service Agent.
To ensure a long service life and to avoid any damage to the equipment, perform the following maintenance operations regularly.
Daily inspection and maintenance
– Before operation, check the equipment for loose screws or missing parts. Pay particular attention to the tightness of the cutter blade or nylon
cutting head.
– Before operation, always check to make sure that the cooling air passage and cylinder fins are not clogged.
Clean them if necessary.
– Perform the following maintenance operations daily after use:
• Clean the Brush cutter externally and inspect it for damage.
• Clean the air filter. When working under extremely dusty conditions, clean the filter several times a day.
• Check the blade or the nylon cutting head for damage and make sure it is firmly mounted.
• Check that there is sufficient difference between the idling and operating speeds to ensure the cutting tool is at a standstill while the engine
is idling (if necessary, reduce the idling speed).
If the cutting tool continues to rotate during engine idling, consult your nearest Authorized Service Agent.
– Check that the I-O switch, the lock-off lever, the control lever, and the lock button are all functioning correctly.
Servicing instructions
Spool 80mm (3-1/8")
For left hand rotation
Spool
100mm (3-15/16")
Notches
Eyelets
Cover
Protrusion
Slot of eyelet