Operator’s manual
Double-sided disc mowers
with central suspension
- 23 -
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 an opporunity to manufacture very durable mowers (even up to 1000%).
3.
The most even stubble with very low grasses is obtained with disc mowers when half of
the discs rotate to the right and half to the left. A disadvantage of this system is a narrow and
thick windrow which needs to be spread out.
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 of mowing height.
2.
Operation speed
≥
10 km/h.
3.
PTO rpm = 950÷1000 rpm. PTO rpm > 1000 may cause stripes of uncut grass between the disc.
4.
Tractor’s rpm (max. moment – economical fuel consumption 1600÷1800 rpm).
High and inclined grass
5.
Heighten the cutterbar’s inclination to – H = about 4.5 cm.
6.
Operation without cutterbar’s inclination may cause winding of grass on the forming drums.
7.
Speed up to V
≥
12 km/h (the faster – the better)
8.
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 mowed grass. It impairs slightly the quality of
mowing and has an influence on mower’s operation. When the cutterbar is pulled in 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, first and second cut should be mowed at height level - 6-7 cm, but
when the grass grows low – at height level - 5 cm. The last cut should be mowed a little bit
higher – 7 - 7,5 cm above the ground.
Too high PTO rpm whirl the air, which may cause inclination of the grass in front of discs. It
impairs the quality of mowing.
Too low PTO rpm impair the quality of mowing and in some cases the mower stops
mowing.(too low linear velocity of the knife).
In contrast with 2-drum mowers straight mounting of the mower and full speed is not always
possible. Adjust experimentally inclination of the mower, PTO rpm, speed and correctness of
knife-mounting.
In case of mowing soft meadows the pressure of the cutterbar on the ground should be reduced
by adjusting support springs.
5.7.2.
Taking turns over swaths
Lift the mower with hydraulic cylinder (Pos. 2 Fig. 3) and take turn. The mower does not
need to be additionaly lifted by tractor’s 3-point linkage.
