Hansa C27hs O&M Manual - Issue 1 - 04/10/2016
© Hansa Chippers 2016
6
M
AINTENANCE
&
S
ERVICE
Blade Resharpening
When the blades are blunt, the machine will not operate efficiently. Often material comes out in long strips.
The blades need to be removed for sharpening. Procedure to remove and sharpen blades:
1. Open the outlet chute by removing the two locking bolts.
2. With a 24 mm ring spanner loosen the three clamping bolts on each blade. Remove the blades, be
careful not to drop the nuts, bolts or blades into the chipper. A stick magnet can be used to retrieve
them if this does occur.
3. The blades should be sharpened on a surface grinder. Make sure there is plenty of coolant used
when grinding, to avoid softening of the material. The cutting angle is critical for the performance of
the chipper and should be 31°. If you are unable to re-sharpen the blades yourself, either contact a
professional sawdoctor, or if more convenient contact Hansa to arrange re-sharpening. Normally
only a slight touch up is needed. In this way your blades should last for a long period of time. The
blades can be ground back to a minimum width of 105mm. After this the blades should be replaced
for best performance. Always replace blades in pairs to keep the rotor in balance.
4. Remount the blades in the reverse procedure, making sure that all mounting surfaces are cleaned
beforehand.
5. The clearance between the blade and anvil should be approx 3mm (as shown in the diagram below).
If there is not enough clearance, the blade edge may touch the anvil through deflection when cutting
heavy branches and damage the blade edge. Too much clearance will allow small twigs and fibrous
materials to be dragged through without being cut.
6. To set the gap adjust anvil accordingly.
7. Once the blades are set, make sure you tighten all bolts properly then turn the rotor by hand and
check if the rotor turns freely.
Blade set-up:
Blade angle is 31°
Set blades 3mm from anvil
Torque blades to 215Nm
