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4.1.
1 -
ADJUSTING
THE ENGAGEMENT AND
CHECKING THE BLADE BRAKE
General informations
The blade is run from the engine using a «V» belt
and is engaged by a stretcher worked from the le ver.
After a certain amount of use the belt can become
longer which can result in malfunctioning, i.e.:
– belt slipping = belt stretched
– difficulty in disengaging, with a stiff lever and the
blade continuing to run = belt shortened
In both cases the stretcher needs to be adjusted.
The blade has a brake which stops rotation within
fi ve seconds:
Longer braking times do not comply with safety re
gulations, but adjusting the brake so that it stops
quicker than this can cause the belt to slip on the
shoe resulting in overheating with the typical smell
of burnt rubber.
Related topics
Removal of the side guards
Replacement of the drive belt
Replacing the blade engagement cable
A) Adjusting blade engagement
• Remove left guard.
With the cutting deck in its lowest position, suitably
turn the adjuster nuts (1) until the spring (2) reaches
the length “A”:
120 124 mm
measured from the outer side of the coils with the
blade engaged.
• Reassemble the left guard.
B) Checking the blade brake
Correct operation of the brake, which must ensure that
the blade stops within 5 seconds from disengagement;
longer stopping times do not comply with the safety
standards.
Braking force comes from the spring (3) working the
shoe (4) and is not adjustable; if the blade should not
stop within 5 seconds from disengagement, the only
possible reason is that the wheelbase between the two
tie rod pins (5) is not correct, it must be 243 - 247 mm
to allow the shoe (4) to operate correctly.
If not, adjust the nuts (6) to get the right size.
MODEL YEAR 2015
MJ66-Hy
MJ66
WORKSHOP MANUAL
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