Use and Care Manual
WEAR PLATE ADJUSTMENT
When the knife or wear plate is replaced, you must check and set
the clearance between the knife and wear plate.
The clearance between the knives and wear plate should be
approximately 1 mm at the position of closest to the rotor shaft
and 3 mm at the position of farthest to the rotor shaft.
Refer to the diagram below for more details.
Wear Plate
If the cutting disk surface is not cleaned properly and
the knives are not mounted ush on the cutting disk,
the knives could crack when the hardware is tightened.
The clearance between the knives and wear plate should be
approximately 1 mm at the position of closest to the rotor shaft
and 3 mm at the position of farthest to the rotor shaft. They are
tapered out slightly to allow for a small amount of movement in
the cutting disk as it bites into the wood.
Make sure that all locknuts are tightened properly. Then turn the
cutting disk with a long wooden stick to make sure it rotates freely.
KNIFE RESHARPENING
After removal, the knives should be sharpened on a surface
grinder. Be careful and wear gloves to protect your hands. It is
extremely important to consistently maintain the 38-degree
cutting angle for proper performance.
Make sure there is plenty of coolant used during the grinding
process, since excessive heat damages the knives and weakens
the metal. If you are unable to resharpen the knives your self, take
them to a professional machine shop for proper resharpening.
Normally only as light touch-up is needed.
WEAR PLATE REMOVAL AND REPLACEMENT
The wear plate is case-hardened and reversible. Normally the
edges will last for a long time. When the edge is rounded off, it can
be reversed. The wear plate cannot be resharpened; it will lose
its hard edge due to being case-hardened. When both edges are
worn, the wear plate should be replaced.
1. Remove the feed hopper. (See Figure 13)
2. Remove the locknuts and bolts that attach the wear plate to
the chipper assembly and then remove the wear plate. (See
Figure 17)
3. Install the new wear plate and secure with the bolts and
locknuts.
The gap between the knife and wear plate must be
adjusted whenever the wear plate is removed.
Figure 17
Figure 18
Wear Plate
Cutting Disk
Blade
1 mm clearance at the position of closest to the rotor shaft
3 mm clearance at the position of farthest to the rotor shaft
Side View: blade & anvil set up
Be careful and wear gloves when working near the
knives.
7. Remove the dull or damaged knives and visually inspect the
cutting disk slot and knives mounting area. Make sure they are
clean and that there placement knives will be able to mount
ush against the cutting disk. Remount new or sharpened
knives with the knife edges facing up.
16
mm
13
mm
18
mm
19
mm
30
mm
32
mm
5
mm
19
YW7565PM04 - 1710
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Maintenance