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9.0 Hydraulic Systems
9.1 On/Off FCV balancing
Under the toolbox at the front of all trailed machines is a flow control valve tap which controls the flow to
the main lift rams and also the seeding shut-off ram. The shut-off ram has a magnet attached to one end
that starts and stops seed dispensing based on its proximity to the parent sensor. Correct balancing of this
system is essential to maintaining a responsive system.
Less flow means the shut off responds quicker but lift will be fractionally slower. More open, will result
in a quicker lift but will mean the shut off ram becomes lazy and could result in over-seeding at the end of
each run and delays, therefore under-seeding at the start of each run.
9.2 Fan Return Pressure
When connecting to a tractor for the first time, ensure the fan return pressure is below 15bar (the lower,
the better). Exceeding this will result in damage to elements of the drills hydraulic system.
9.3 Coulters
The contour-following ability of coulters as well as the break-back leg system operates on a constant oil
flow design whereby a low flow rate is constantly replenishing oil displaced from the coulter rams by
undulations and obstructions. The downward force from these coulters is governed by an adjustable relief
valve which maintains the correct pressure in the circuit. Additional capacity and a guarantee of rapid
response is provided in the way of accumulators.
9.4 Axle Lift/Shut-off System
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