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DISCS AND KNIVES
Discs, knives and securing elements are manufac-
tured from high quality steel and have been subjected
to a heat-treatment to assure a high resistance to wear.
Worn or damaged items must immediately be replaced
with genuine KUHN parts as otherwise warranty will be
withdrawn.
CAUTION : ONLY USE GENUINE
KUHN SPARE PARTS.
Worn knives should either be turned over on the same
disc to use the other cutting edge, or replaced. When
turning or replacing the knifes, make sure there is a 1
mm minimum gap between the knives or their mounting
bolts and the cutterbar wear plates. If otherwise, insert
one (maximum two) distance spacer(s) (code 568 071
00) between the discs and the disc bearing stations
(see fig. 50 A, page 33). Dull knives require more horse
power to cut the crop and will leave an uneven stubble.
To replace or turn over knives, first clean the area
around nut (A) (photo 49) and remove nut with the box
spanner supplied with the machine. Ensure securing
elements are in good condition and fit knives so that
the arrow on their upper face is pointing in the direction
of rotation of the disc it is fitted to.
Torque locknut to
12 daNm (90 ft.lbs).
IMPORTANT :
ALWAYS REPLACE
SECURING ELEMENTS (LOCK-
NUTS AND BOLTS) WHEN THEY
HAVE BEEN REMOVED 5 TIMES.
CAUTION :
ALWAYS REPLACE
DAMAGED KNIVES, NEVER
STRAIGHTEN A BENT KNIFE.
NEVER REPLACE ONE KNIFE ONLY
PER DISC, ALWAYS REPLACE
BOTH OF THEM TO AVOID CREAT-
ING AN OUT-OF-BALANCE FORCE.
Discs are secured by 4 nipple screws (B) and 4 conical
spring washers (C) on a hub (fig. 50).
Two of these diametrically opposite bolts are also used
to secure the conical covers on top of the discs.
Tighten all 4 bolts to a torque of
12 daNm (90 ft.lbs)
.
The discs must have their largest diameters positioned
at right angles to each other (see photo 49). This
positioning must be scrupulously respected so as to
avoid interference between the knives. Take extra care
when fitting the conical spring washers (C) (fig. 50),
which must be positioned with the conical centre at the
top.
50
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