CH 160
20
It is recommended that the knives be sharpened to a
concave shape. If this is not possible, the knife is
sharpened to a flat profile. Fig. 21.
About 0.3 mm (0.01”)
Fig. 21.A knife with a flat profile
The hone angle is ground to a 45
°
angle with two to three
longitudinal strokes, using a level sharpening stone.
Burrs are removed from the knife fastening bolt side,
grinding with the surface.
Fig. 22.
Fastening bolt side
Fig. 22.Final grinding of the knife.
9.4.REMOVING THE ANVILS
The chipper features both a vertical and horizontal anvil.
To remove the anvils, open the fastening bolts (A) and
(B) (M16). The horizontal anvil fastening bolt (B) is
located below the feed opening. Fig. 23.
Vertical anvil
Horizontal anvil
A
B
Fig. 23.Anvil fastening bolts
9.5.SHARPENING THE ANVILS
If you notice wear or rounding of the inner edge of the
anvil, sharpen the anvils so that the original angles are
retained. Fig. 24.
57
°
Vertical anvil profile
72
°
Horizontal anvil profile
Fig. 24.Anvil profiles.
9.6.INSTALLING THE KNIVES AND ANVILS
D
Check the condition of the fastening bolts and nuts.
D
Install the knives and anvils and tighten the fastening
bolts to the torques specified in Table 2..
D
Adjust the knife---to---anvil clearance. For more
information
on
adjusting
the
knife---to---anvil
clearance, see Section 9.7.
9.7.ADJUSTING THE KNIFE---TO---ANVIL
CLEARANCE
The need for adjusting the anvils is determined by the
amount the knives are sharpened. Always check and, if
necessary, adjust the clearance between knives and
anvils:
D
After a heavy sharpening;
D
If the knives were removed --- for example, due to
sharpening;
D
If new knives are replaced.
Check the clearance with a feeler gauge.
1. Loosen the anvil fastening bolts (A) and (B) (M16). Fig.
23.
2. Turn the disk so that a knife and the anvil are aligned.
Place a feeler gauge between the knife and anvil.
Adjust the vertical anvil clearance with the adjusting
nuts (M12) (C, Fig. 25.) to 1.2–1.5 mm (0.05–0.06”).
3. Tighten the adjusting nuts (C) and anvil fastening bolts
(A).
4. Adjust the horizontal anvil clearance at the front edge
to 4–5 mm (0.16 – 0.20”).
5. Tighten the fastening bolt (B).
6. Re---check the knife---to---anvil clearances.
A
C
Fig. 25.Vertical anvil fastening and adjustment.
