horsch Maestro 12.45 CV, Operating Instructions Manual

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¾
Plug the pump on to the PTO-shaft.
¾
Fasten the anti-twist lock.
For this purpose fix the adjusting rod in the slot
and in the bolt for the upper link without apply-
ing any tension. Match height and distance.
Anti-twist lock
The PTO-shaft speed should not be chosen too
high. This would cause elevated oil temperature.
Depending on the fertiliser quantity, a speed of
700 rpm may be quite adequate.
When sowing sugar beet without fertiliser,
500 rpm may already be enough.
Once the required fan speeds have been set,
one should reduce the PTO-shaft speed, until
the fan speed starts to drop.
Now raise the PTO-shaft speed again by approx.
10 %.
Function
The two PTO-shaft pumps drive the hydraulic
motors for the fertiliser fan and the vacuum fan.
The flow control valves (1 / 2) are used to regu -
late the oil flow and thus the fan speed.
The oil in the return flow is guided through the
cooler and a filter back into the oil tank.
NOTE
¾
Allow the PTO-shaft pumps to warm up prior
to use in the field for approx. 5 min at idle
speed.
Fan speed adjustment
The rotational speeds for both fans are adjusted
with a hand wheel.
1
2
1 Rotational speed of fertiliser fan
2 Rotational speed of vacuum fan
Due to the additional cooling function, the fer-
tiliser fan must always run at a speed of min.
3000 rpm.
The vacuum fan can be regulated to lower
speeds, depending on the different seed types.
NOTE
¾
The rotary speed settings must be checked
once again with the oil warmed up.
Coulter pressure
Coulter pressure is hydraulically generated by
the fan drive.
For this reason the fan must be driven when
adjusting the coulter pressure.
The coulter pressure can be adjusted via the
drill controls.
The currently possible maximum coulter pres-
sure is shown on the hopper pressure gauge.
Checks and maintenance
¾
Check the oil level.
¾
Observe the oil temperature (< 80 °C).
¾
Clean protective fan grid and radiator fins from
contamination.
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