KUHN ALTERNA 400, Operator'S Manual

Page: 72 / 80

Mower conditioner
70
ALTERNA400
Maintenance and storage
Knife replacement
Clean the nut case.
Place a wooden wedge between two discs to stop them
from rotating.
Loosen nut using box spanner supplied with the
machine.
Remove bolt through opening located at the front of the
disc guard.
Knives can be turned over on the same disc to use the
other cutting edge or replaced. On each knife, an arrow
indicates the disc's direction of rotation.
Make sure that the securing nut and bolt are in good
condition and if necessary, replace them.
Torque knife locknut to 12 daN m (89 lbf ft).
Dull knives require more horse power and have a
negative effect on the cut quality.
Disc replacement
Place a wooden wedge (2) between two discs to stop
them from moving.
Remove 4 bolts (1) and their spring washers using the
box spanner supplied with the machine.
Remove the disc.
When remounting:
Position their largest diameters at right angles to each
other.
Position conical centre of spring washer at the top.
Torque bolts to (1):
- Torque: 12 daN m (89 lbf ft).
Replace knife lock-nuts and bolts when they
have been removed 5 times.
Replace immediately all worn or distorted
knives. Never straighten a bent knife.
Always replace both knives per disc.