JF-Stoll FC 855, Инструкция по эксплуатации

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1. INTRODUCTION
If we take a forage harvester which, in fresh, not pre-dried grass, can work 100 tons
per hour, it is possible to calculate the capacity at different per cents of dry matter
depending on the pre-treatment before cutting, as shown in the following table.
Dry matter Capacity
Dry matter 100% 18 ton/h
Wet new grass 15% 120 ton/h
Not pre-dried grass 18% 100 ton/h
Pre-dried grass – no outflow of sap from clamp
silo 25% 72 ton/h
Pre-dried grass – no outflow of sap from high
tower silo 33% 55 ton/h
Very pre-dried grass 50% 36 ton/h
Straw, very dry 90% 20 ton/h
It will probably surprise most people that the capacity can vary between 20 and 120
ton/h, as a result of varying water content.
In practice you want to drive the forage harvester in the highest possible tractor gear
without causing frequent blockage. However, the amount of grass in the field will
always vary, for instance where the mower conditioner has had to turn, change
forward speed or change direction of travel. Therefore it is often appropriate either to
drive with a power reserve so that the machine will not block, or to continuously
adapt the driving of the forage harvester to the conditions.
The pick-up unit and the feed rollers are both secured against overloading resulting
from a blockage by means of a friction clutch. The forage harvester also has a
reverse function which makes it possible to remove a blockage without having to
leave the tractor seat.
The intention is that the inexperienced user increases the forward speed gradually in
the beginning until the pick-up is blocked; releases the blockage again by reversing
and chooses a tractor gear at a suitable lower level to reduce the risk of blockage.
However, it is not the intention that the clutch function of the feed rollers releases. If
this happens, the clutch adjustment of the pick-up must be reduced. The same will
apply if the main friction clutch between the tractor and the machine releases during
normal working. If it is not the pick-up unit which is blocked, the adjustment of the
machine is incorrect.
Unfortunately it has been seen before that the torque adjustment of the friction clutch
of the pick-up unit has been increased to the point where it is the friction clutch
between the machine and the tractor which releases frequently. The main friction
clutch is not intended to release frequently but only for starting shock or when foreign
matter gets into the machine. The same applies to the friction clutch for the feed
intake rollers. The main clutch simply cannot absorb the heat which is generated
during these long releases. The power transmitted at the main clutch will be at least
10 times higher than the power needed to drive the pick-up unit.
Only the pick-up unit can be seen from the tractor and therefore it should be released
first when there is a blockage. The experienced user will be able to adapt the driving
PIGB-138X-02 FC 855 0410
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