Hayter Mowers Condor hydrostatic Drive 510D - Manual (Page 40)

1.40 1.40 MAINTENANCE
Verge Attachment continued
Finally tighten locknuts ‘B’ using 2 spanners to
avoid inadvertent movement of adjuster nuts ‘C’
and tighten setscrews ‘A’. Recheck the cutting
action as previously described to ensure that the
setting has not moved.
If it is impossible to obtain a good clean paper
cut across the entire length of the bottom blade it
will be necessary to remove any high spots on the
spirals/bottom blade with a stone. In severe cases
it will be necessary to regrind the cutting cylinder
and the bottom blade, refer to GRINDING.
Do not be tempted to over adjust causing heavy
contact between the cylinder and bottom blade
as this will cause very rapid uneven wear to take
place leading to tram lining and waviness of the
cutting edges. The frictional losses will be high
and a significant amount of power will be absorbed
thus reducing the power available for cutting. The
heating effect due to friction will cause excessive
expansion to take place which will further aggra-
vate the situation by increasing the contact pres-
sure.
If the cutterhead is allowed to operate for more
than a few hours without adjustment the running
wear will eventually cause the cylinder to run out
of contact with the bottom blade. At this stage very
rapid rounding of the cutting edges will occur as
grass and abrasive particles pass through the clear-
ance between the blades.
Lack of attention to adjustment can therefore
be foolhardy as maintenance costs will escalate.
Quality of cut will also be seriously affected as
will the health and growth of the grass.
An experienced operator will notice when a cutter-
head starts to go out of adjustment, when the grass
ceases to be cut cleanly and the cut ends become
ragged.
Cutterhead grinding: It will be necessary to
carry out a grinding operation to correct cylinder
spiral edges or a bottom blade edge which have
become excessively rounded or distorted. A bot-
tom blade which is nearing the end of its wear life
should be replaced and this should be ground on
its holder prior to fitting, refer to CUTTERHEAD
BOTTOM BLADE REPLACEMENT.