Basic Function - Husqvarna K6500 Ring Workshop Manual

2
A
B
4

BASIC FUNCTION

C
B
C
C
A
C D
A
B
The blade's drive and guiding system
Eccentric drive
The unique concept behind the K6500 Ring is its
eccentric drive (outside the centre) and guiding of the
cutter blade (A).
Function
The drive wheel (B) which is powered by a belt driven
off the engine, has a groove into which the blade slots.
The two engagement rollers (C) exert pressure against
the blade (from the engagement roller springs, when the
knob is tightened), causing the blade to press against
the drive wheel. The lower picture shows how the enga-
gement roller flanges grip in the cutter blade's groove.
The only function of the support roller (D) is to exert
counter-pressure so that the blade is located properly
against the rollers without any play or clearance.
With this design, the cutter blade can be guided in
both the radial and axial directions (rotating and lateral
movements). Three points (at the two engagement and
support rollers and at the drive wheel) guide the blade
at the same time as the pressure against the drive wheel
generates sufficient friction to drive the blade.
Important for good function
The description of the function indicates that it is parti-
cularly important that the engagement rollers can move
axially without interference from the spring force (the
direction of the arrows), so as to provide the correct
pressure against the drive wheel. Corrosion or dirt that
blocks movement will cause the blade to slip against the
drive wheel. A properly greased bearing housing will
reduce the risk of operational disruption.
There must be zero clearance in the adjustment of the
engagement and support rollers against the sides of the
blade. The adjustment is to be changed when the blade
is replaced and must be checked at least once during the
life of the blade. Because the adjustment is mechanically
locked, there is no movement once the locknuts have
D
been set and tightened.
Wear
In comparison with a traditional centre-driven machine,
the blade's drive and engagement systems are subjected
to harder wear since the mechanical parts work con-
stantly in an environment of water and slurry.
Parts subject to wear
The wear-prone parts are the drive wheel, engagement
rollers and support rollers (B, C and D in the figure).
These parts can be quickly and easily replaced and this
job is normally carried out by the user.
IMPORTANT
In all control and adjustment work on the engagement and
support rollers, the knobs that tensions the blade against
the drive wheel must be screwed out to its end position.
NB: The knobs must not be fully screwed to the end
position as this restricts engagement roller rotation.