35 | P a g e
5.2.6 Fan System
If it is found that the fan speed cannot
be adjusted finely enough due to the
increment being too large on the
tractor spool, there is a needle value
located at the bulk head end of the
hydraulic pipe that feeds the fan.
The adjustment should be carried out
by setting the fan speed slightly higher
than desired and then reducing the
flow of oil by rotating the needle valve
clockwise.
Fan Return Pressure
When connecting to a tractor for the first time, ensure the fan return connected.
Failure to do so will result in damage to elements of the drills hydraulic system.
Fan/Coulter Pressure Gauges & Balancing Valves
The below are the indicators of pneumatic flow in the Fan/Coulter air system.
Low Pressure High Pressure
The seed/fert transfer pipes are fitted with fan balancing valves so that
adjustment can be made to the velocity of the air travelling through each pipe.
This may be necessary when there is a large difference in application rates
between each metering unit. For example, there may be a situation when you
are drilling 120kg/ha of seed and 340kg/ha of fertiliser, the percentage air
velocity on the seed side would need to be less to cater for the difference in
seed/ fert rates. This can be achieved by adjusting the air valve on the seed pipe
by moving the lever towards the rear of the machine (reducing air velocity).
Where possible the valves should be left fully open, only reduce the air velocity
on the pipe metering the reduced rate. Where rates are equal the valves should
both remain fully open.
5.2.7 On/Off FCV Balancing
To Next Page
Loading...
