Hansa C21 O&M Manual - OM-010 Revision G 13/06/2019
© Hansa Chippers 2019
15
Edge of
cutting
rotor
After sharpening, the width of the knives
will have been reduced, therefore the gap
between the knives and anvil may require
adjustment. This gap is tapered out slightly
to allow for a small amount of movement in
the cutting rotor as it bites into the wood.
If there is not enough clearance, the knife
edge may touch the anvil through
deflection when cutting heavy branches
and damage the sharp edge. Too much
clearance will allow small twigs and fibrous
materials to be dragged through without
being cut.
Adjust the knife in or out using the two
adjustment bolts to achieve the correct
clearance between the knife and anvil. The
clearance between the knife and anvil
should be approximately 1 mm on the
inside closest to the bearing and 3 mm on
the outside closest to the edge of the
cutting rotor (refer to diagram for more
detail).
After the correct clearance is set, fully
tighten the clamping bolts
using a torque
wrench to 77 Nm and tighten the locking
nuts on the adjustment bolts.
Note:
Before adjusting the knives, ensure
the gap between the holding block and the
anvil is 4 - 5 mm. If not, then the anvil can
be adjusted through the mounting slots.
Once the position has been set, tighten the
three M10 countersunk anvil bolts and
torque to 44 Nm, then make further
adjustments with the knives as described
above.
Turn the cutting rotor slowly by hand to
check that it turns freely.
Close and secure the outlet chute.
Anvil adjustment/replacement
When cutting edge of the anvil is dull, the anvil may be reversed can be reversed. Each edge of the anvil will typically last for several
hundred hours of operation. When both edges are worn, the anvil will need to be replaced.
To access the anvil the inlet chute needs to be removed (use the reverse procedure to fit the inlet on page 3). A 5 mm Allen key, a
17 mm socket and an extension are required to remove the anvil.
With the knives removed or set right back, the gap between the knife holding block and anvil should be 4 - 5 mm. The position of
the anvil can be adjusted through the mounting slots. When this has been set, tighten the three M10 countersunk anvil bolts using
a torque wrench to 44 Nm and then make further adjustments with the knives as described above.
Turn the cutting rotor slowly by hand to check that it turns freely.
WARNING!
Every time the knife clamping bolts are torqued up to 77 Nm and loosened off again, the life of the bolts is
reduced. The knife clamping bolts must be replaced at most after every six sharpens. Contact Hansa for replacement
bolts (m12x50 bolts of grade 10.9 or higher). Use only genuine Hansa bolts.
8
Anvil
Cutting
rotor
Knife
1 mm
clearance
3 mm
clearance
Bearing
Top view: Knife and anvil set-up
7