Specifications

SERVICE INSTRUCTIONS
25
1. Turn off the chipper and remove the key.
2. Remove the negative battery lead.
3. Turn the discharge tube to point across the
machine.
4. Using a 24mm socket with extension bar to
remove the two M16 nuts clamping the rotor
housing shut.
5. Carefully lift the rotor housing until its rests on
its stop.
6. Using the fan blades turn the rotor so the first
blade to be changed is in a convenient
position. Wedge rotor against housing with a
wooden block to prevent turning.
7. Brush away all dirt and debris from the rotor
and blades.
8. With a 24mm spanner undo the two nyloc
nuts that are holding the blade in place.
9. Grasp the blade by the flat edges while
wearing heavy gloves.
10. Withdraw the blade from the rotor.
11. If the blades are being rotated and not
replaced, do not remove the blade bolts.
12. If the blades are to be renewed, place the
blade on a flat surface and tap the top of
the blade bolts with a hammer. The bolts
are designed for this. They should loosen
from the blade. Withdraw them completely.
13. Clean the back surface of the blade, blade
bolts and blade area of the rotor before
reseating blades. The blades must not
have any material underneath them
when tightened. If they are not flat and
tight they will become loose quickly.
14. Reassemble the blades, washers and bolts
in the order they were removed.Reassemble
the blades, bolts, washers and nuts in the
order as shown above. Use only Genuine
Timberwolf Nuts and washers, as they are
of a higher grade than normally stocked at
fastener factors. Failure to use the
appropriate grade nuts or washers may
result in damage, injury or death. The use
of Genuine Timberwolf blades and bolts is
recommended.
15. Apply a smear of anti seize compound
(copper ease) to the bolt threads and back
face of the nuts. Do not apply copper grease
onto the tapered faces of the blades or bolts.
16. Wedge rotor against housing with a wooden
block to tension nuts.
17. A calibrated torque wrench must be
used to Tighten the bolts to a toque
setting of 125 lbs.ft (170 Nm).
18. Repeat this procedure for the other blade.
19. Slowly lower the rotor housing to its original
position.
20. Refit the two M16 nuts and tighten to
60 lbs ft (80Nm).
21. Re-attach battery lead.
WARNING
Wear heavy gloves for the blade changing operation.
CHANGE BLADES (ALL MODELS)
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WARNING
Always sharpen blades on a regular basis. Failure to do so will cause the machine
to under perform and will overload engine and bearings causing machine
breakdown. Blades must not be sharpened beyond the wear mark (see diagram).
Failure to comply with this could result in machine damage, injury or loss of life.
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5
6
8
10
THIS PROCEDURE SHOULD ONLY BE UNDERTAKEN WITH THE DISCHARGE IN PLACE.
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WEAR
MARK
Model shown 190DHB
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