Operating manual
Rear disc mowers with central suspension
- with hydro-pneumatic or spring suspension
- 2 8 -
2.
A certain disadvantage is the not as pretty, wavy stubble (after gathering) especially when
mowing fallen grasses. Straight grasses can be mowed with the mower in the horizontal
position and then the stubble will be even but it will not be as attractive as with the 2-drum or
4-drum mower, because the cutting blades cut in a horizontal position which creates an air gust
which bends the blades which stand up after passing and create the impression of inaccurate
mowing (see Pict 14).
3.
Every mower can leave small furrows when the blades cut with the grain forward. The number
of furrows with mowers KT 260 H, 300 H, 340 H is 2. This is normal. A certain disadvantage
is the not as pretty, wavy stubble (after gathering) especially when mowing fallen grasses.
Straight grasses can be mowed with the mower in the horizontal position and then the stubble
will be even but it will not be as attractive as with the 2-drum or 4-drum mower, because
the cutting blades cut in a horizontal position which creates an air gust which bends the blades
which stand up after passing and create the impression of inaccurate mowing.
4.
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.
5.5.1. Basic mowing information
Optimum operating parameters
•
A forward tilt of 0-5 degrees means approximately 4.5-7 cm of mowing height.
•
operating V
≥
10 km/hr.
•
Power take-off revolutions = 950-1000 rpm. Revolutions of the power take-off > 1000 can
cause a furrow of grass between the discs.
•
Engine revolutions (
max. momentum - economic fuel consumption 1600-1800 rpm).
Trawy wysokie i wyległe.
•
Increase the tilt forward - H = about 4.5 cm.
•
Operating without tilting will cause the grass to roll up on the drums.
•
Increase the speed V > 12 km/hr (the faster the better).
•
Do not turn in the grass.
•
Optimum position of the cutting bar to the ground is from 0° to 5° (See Pict on page 1).
1.
With the tilt greater than 6° there is a possibility of slight remaining furrows of unmowed grass.
This slightly reduces the appearance of the area mowed and has very small influence on
the operation of the mower. When the cutting bar is angled in the opposite direction the quality of
mowing dramatically decreases, in extreme instances the mower stops mowing completely.
Additionally it could cause damage to the cutting bar.
2.
When there is a majority of high grasses the first and second mowing should be done at a height
of 6-7 cm, while with the majority of low grasses at a height of 5 cm. The last mowing should be
done a bit higher - 7 to 7.5 cm from the ground.
3.
Exceedingly high revolutions of the power take-off of the tractor (engine) result in the creation of
high air currents when the discs are rotating which considerably reduces the quality of mowing.
4.
Too low revolutions of the power take-off of the tractor (engine) cause a reduction in mowing
quality and in extreme instances the mower stops mowing completely.
5.
In contrast to the 2-drum mowers it is not always possible to simply hitch up the mower and floor
the gas pedal. It is necessary to think a bit and match the angle of the mower to grass type, engine
speed, driving speed and properly install the blades.
6.
With re-cultivated pastures during first mowing or after long lasting heavy rains it is necessary to
reduce the pressure of the bar on the ground by adjusting the spring or the hydro-pneumatic
suspension.
