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DISCS AND KNIVES
Discs, knives and securing elements are manufactured 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withdrawn.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). 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 (photo 49). This position-
ing 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.
