MACHINE MAINTENANCE
ENGLISH
7.10.1 SHARPENING THE BLADES
a)
The blade may be sharpened with a file or a grinder. Do not performthe sharpening directly on the mowing mechanism. Pay great attention to the align-
ment and balancing of the blades. The vibrations generated by unaligned and unbalanced blades can cause serious damage to the engine or mowing
mechanism. When balancing, insert a screwdriver into the centering hole and set the blade into the horizontal position (see figure 7.10). If the blade
remains in this position, it is balanced. If one of the blade ends is overbalancing, grind this side until the blade is balanced.
The permitted static inbal-
ance may be 2g at maximum.
b) TRIPLEX knives
Dismantle the individual blades from the holder and sharpen them separately. Particular care should be taken whenreassembling in order not to con-
fuse individual blades.
The difference in weight of individual blades can be 2g at maximum.
7.11 STEERING UNIT MAINTENANCE
Check on a regular basis inadmissable clearance between the gear seg-
ment of steering and pinion of the steering wheel shaft. If bigger clearance
is detected, eliminate it. Negligence of this maintenance may result in
damage tosteering unit components. When eliminating the clearance, first,
loosen the two M12 nuts 1 on the screw of the eccentric. Apply a suitable
spanner to the eccentric hexagonal head 2 and turn it until the clearance
is eliminated to the minimum. Then, retighten both M12 nuts 1.
7.12 CHECK AND ADJUSTMENT OF TRAVEL DRIVE BELT
The belt is tensioned correctly if it sags approx. by 1.5 cm when the force of 4 kg
is applied in the mid distance between pulleys
1
and
2
.
Designation of parts in the figure:
1.
engine pulley
2.
guiding pulley
3.
tension pulley
4.
gearbox pulley
Adjustment of belt tension is performed by tightening of nut on the screw tensioning the tension
spring, and then by readjusting screw 3 (fig. 7.11) so that the spring will be tensioned to the length
of 50
앐
1 mm. Do not overtighten the belt. Too much tension lowers the belt’s operational life!
7.13 CHECK AND ADJUSTMENT OF MOWING
MECHANISM ADJUSTMENT
The correct adjustmentof the mowing mechanism is important to ensurehigh quality mowing.
When checking and adjusting proceed, as follows:
•
Place the machine on an even surface and check the tyre pressure.
•
Set the mowing mechanism height adjustment lever
6.1.17
to the position "
2
".
•
Check the height of the mowing mechanism front edge above the ground which must be
the same on both sides, 17 - 19 mm.
•
Adjust the difference by turning nut
1
after loosening locking nut
2
.
The nuts are accessible after removing the accumulator box
(for SJ2..., SJ3..., SJ4..., SJ5... type machines), or the tool box
(for SJ8..., SG8...machines).
•
After adjustment retighten nut
2
.
7.14 CHECK AND ADJUSTMENT OF MOWING
MECHANISM DRIVE V-BELT
The V-belt of the mowing mechanism is tensioned by means of a pulley with
a spring. If the tension releases due to the working stress of the belt, increase it
by displacing the suspension eye of spring
1
into the second hole in lever
2
of the
tension pulley.
23
50
앐
1 mm
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