GGP SBC 425 H Operator's Manual page 21

Clean the filter as follows:
– P ress the tab (3), remove the cover (1) and the
filter element (2).
– W ash the filter element (2) with soap and wa-
ter. Do not use petrol or other solvents.
– L eave the filter to dry in the open air.
– R eassemble the filter element (2) and the cov-
er (1).
5.6 CHECKING THE SPARK PLUG ( (Fig. 17)
Periodically remove and clean the spark plug us-
ing a metal brush to get rid of any deposits.
Check and reset the correct distance between
the electrodes.
Replace the spark plug and fasten it firmly using
the supplied wrench.
The spark plug must be replaced with one with
the same characteristics whenever the elec-
trodes have burnt or the insulation has worn, and
in any case every 100 working hours.
5.7 ANGLE TRANSMISSION (Fig. 18)
Lubricate with lithium-based grease.
Remove the screw (1) and put in the grease,
turning the shaft manually until grease emerges,
then replace the screw (1).
5.8 BLADE MAINTENANCE
5.8.1 Sharpening the 3 or 4-point blade
(Fig. 19)
WARNING! Use protective gloves. If
sharpening is done without removing the
blade, disconnect the spark plug cap.
Sharpening must be done taking account of the
type of blade and cutting edges, using a flat file
and working all the points equally.
The references for correct sharpening are given
in Fig. 19:
A = Incorrect sharpening
B = Sharpening limits
C = Incorrect and unequal angles
IMPORTANT It is important to retain the correct
balance after sharpening. For safety reasons,
sharpening and balancing should be done by a
Specialised Centre with suitable skills and equip-
ment for the job; without risking any damage to
the blade which would make it unsafe when used.
3 or 4-point blades can be used on both sides.
When one side of the points is worn, the blade
can be turned and the other side used.
WARNING!
paired, but must be replaced as soon as
signs of breaking are noted or the sharpen-
ing limit is exceeded.
5.8.2 Sharpening the 3 or 4-point blade
Blades bearing the code indicated on the chart
on page 3 should be used on this machine.
Given product evolution, the above mentioned
blades may be replaced in time with others hav-
ing similar interchangeable and operating safety
features.
5.9 HEAD LINE REPLACEMENT
5.9.1 Cutting line head type "I" (Fig. 20)
1. R emove the remaining line pulling it out of
the centre of the starter grip (1). If it is broken
off inside, press the point indicated «PUSH»,
turn the head cover (2) anticlockwise and re-
move the line remaining inside. Close the
head again, aligning the reference notch (3)
and turn the cover (2) clockwise.
WARNING!
erly closed along the entire perimeter to pre-
vent it from opening during work, with the
risk of damage or injuries.
2. Cut the line to the indicated length.
3. T urn the starter grip (1) clockwise until one of
the arrows is aligned with one of the two exit
holes (4) of the line.
4. I nsert the two ends of the line in the centre of
the starter grip (1), making the line exit the two
holes (4) in equal parts.
5. T urn the grip (1) clockwise to wind the line, let-
ting about 120 mm exit from both holes.
5.9.2 Cutting line head type "II" (Fig. 21)
– F ollow the sequence indicated in the figure.
5.10 SHARPENING THE LINE CUTTING
KNIFE (Fig. 22)
– R emove the line cutting knife (1) from the
19
The blade must never be re-
Make sure the head is prop-