Cutterhead Grinding; Cutterhead Bottom Blade Replacement - Hayter MT313 Operator's Manual

MAINTENANCE
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CUTTERHEAD GRINDING

It will be necessary to carry out a grinding operation to correct cylinder spiral edges or bottom blade
edges which have become excessively rounded or distorted. Bottom blades which are nearing the end
of their wear life should be replaced. The new blades should be ground on their holders prior to fitting,
refer - CUTTERHEAD BOTTOM BLADE REPLACEMENT. When grinding operations are necessary
it is essential that both cylinders and bottom blades are ground at the same time. The only exception to
this rule is when a new cylinder is fitted in which case it is only necessary to grind the bottom blade.
All such grinding operations should be carried out by your dealer on a quality, well maintained
cylinder/ bottom blade grinding machine.

CUTTERHEAD BOTTOM BLADE REPLACEMENT

Remove the bottom blade holder by removing the three fixing bolts at each end and withdraw from the
cutterhead. Remove the worn bottom blade and discard the countersunk screws and securing nuts. Fit
the new blade to the holder and loosely assemble with new countersunk screws and securing nuts.
Tighten the centre bolts to a torque of 40 Nm. Continue by tightening the remaining bolts to the same
torque by working from the centre out towards the blade ends.
The new bottom blade must be ground on its holder prior to refitting to the cutterhead.
Adjust the cutting cylinder position to give adequate clearance for fitting the new bottom blade holder.
Refit the bottom blade holder assembly to the cutterhead using the original fixing bolts and tighten to
a torque of 25 Nm. Finally adjust the cylinder to the bottom blade, refer - CUTTERHEAD CYLINDER
TO BOTTOM BLADE ADJUSTMENT.
995901PM140404A