Duncan Enviro 740, Owner'S Manual

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30
15 Length of Seed/Fertiliser Tubes
These tubes can stretch over a period of time and
require checking at approximately 6 monthly intervals.
Check tubes at the operating depth. Shorten if
necessary to avoid bends which will restrict the flow of
seed/fertiliser.
16 Bottom Flaps
The required seed rate is controlled by both the
metering wheels and the bottom flaps. The seed flows
from the seed box into the metering wheel housings.
Inside the metering wheel housing (Fig 39/1) the seed
is caught between the metering wheel (Fig 39/2) and
the bottom flap (Fig 39/3). The metered amount of seed
is transported by the metering wheel to the edge of the
bottom flap where it drops off into the seed guide tube
which leads to the coulter. Varying grain sizes require
the matching of the flap clearance to the different grain
sizes. This matching is done by raising or lowering
the bottom flaps by using the flap adjusting lever on
the LH end of the seed box. If larger foreign particles,
e.g. stones get between the metering wheel and the
bottom flap, the bottom flap can give way downwards.
A strong return spring (Fig 39/4) brings the bottom flap
immediately back into the working position.
The metering system should be checked every 1/2
year or before any sowing period with an empty
seed box and empty metering housings.
Use the following proceedure:
Put the bottom flap setting levers (located on the LH
end of the seed boxes) in position “1” for the front box
and position “1” for the rear box. Refer Fig 40.
By turning the metering wheel shaft by hand check
the flaps are all set to a gap of 0.1 to 0.5mm (refer
Fig 39).
To adjust individual flaps use the spring tensioning
screw (Fig 39/5)
Note: Re Maintenance Schedule
(P27)
Where the frequency is given in terms of time of use
(e.g. weekly) or area covered (e.g.100 Ha) perform the
maintenance task based on whichever occurs first.
Storage
Preparing the Machine for Storage.
Locate a dry level surface. The machine should be stored
wherever possible with the rams retracted. The drive chains
should be lubricated with suitable roller chain lubricant
before prolonged periods of storage.
For longer term storage remove seed/fertiliser tubes from
the coulters and allow to hang without deformation.
fig 40
fig 39
Important !