WARNING!
Improperly relieved cutting unit of the mower will cause increase of cutterbar
pressure on the ground which will lead to faster wear of sliding skids, overload
of cutterbar, higher fuel consumption, damage to the stubble and contamination
of the fodder.
5.7. Operation (mowing)
Dear operator,
If the disc mower is your first experience (you have mowed with 2-drum mower) you need a piece
of essential information:
1. The main advantage of disc mowers is their small power demand – 20% less tractor power, small
moment of inertia and possibility to manufacture mowers with large working width.
2. There is however a certain disadvantage - creased stubble, especially when it comes to lying grass.
Straight grass may be mowed with horizontal adjustment of the mower and then the stubble will
be even but it will not look as attractive as with 2-drum or 4-drum mower, because the knives work
horizontally to the ground and inclined grass bends because of wind blasts. After the grass is
mowed it gets up, which makes an impression of inaccurate mowing.
3. Every mower may leave stripes of uncut grass when it comes to the knives which cut the grass
towards the grass direction.
It is a normal phenomenon. Practically, it is not possible to achieve such attractive stubble as in 2-
drum mowers, because the knives work horizontally or at an angle of up to 8° to the ground, and
when it comes to 2-drum and 4-drum mowers slantwise through the ground (even 23°).
Despite these ‘disadvantages’, disc mowers are ‘winning farmers’ trust’ and modern technologies
give the opporunity to manufacture very durable mowers (even up to 1000%).
5.7.1. Essential information concerning mowing
Optimum work parameters
1. Inclination towards the front 0÷5 degrees which stands for 4.5÷7 cm / 1.8"÷2.8" of mowing height.
2. Operation speed ≥ 10 km/h.
3. Keep the constant PTO rpm = 470÷520 rpm. PTO rpm > 540 may cause stripes of uncut grass
between the disc.
High and inclined grass.
1. Heighten the cutterbar’s inclination to – H = about 4.5 cm / 1.8".
2. Operation without cutterbar’s inclination may cause winding of grass on the forming drums.
3. Speed up to V ≥ 12 km/h (the faster – the better)
4. Do not take turns in the mowed grass.
❑ Optimum inclination of the cutterbar towards the ground is between 0° to 5°.
If the inclination exceeds 5°, there might be a slight unevenness of the mowed grass. It impairs
slightly the quality of mowing and has an influence on mower’s operation. When the cutterbar is
pulled in the other way, it significantly impairs the quality of mowing and in some cases the mower
stops mowing. Besides, it may lead to premature wear or even damage of the slides and cutterbar.
❑ When the high grass prevails, the first and the second cut should be mowed at the height level -
6 - 7 cm / 2.4" - 2.8", but when the grass grows low – at the height level - 5 cm / 2". The last cut
should be mowed a little bit higher – 7 - 8 cm / 2.8" - 3" above the ground.
❑ Too high PTO rpm whirl the air, which may cause the inclination of the grass in front of the discs.
It impairs the quality of mowing.
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