FIELD OPERATION
4-32
DRUM SPEED REDUCER [if installed] -- Figure 45
Using the reduction gearbox, two speed ranges on
the drum can be obtained:
S From 385 rpm to 1140 rpm (direct drive)
This high speed range is used when harvesting
regular crops (i.e. cereal crops, maize, etc.). To
engage this range, push lever L towards the
gearbox.
S From 190 rpm to 560 rpm
This low speed range is used when harvesting
crops with fragile grains (i.e. dry maize, beans,
etc.). To engage this range, pull lever L out-
wards.
NOTE:
When changing speed with lever L, it is impor-
tant to turn the drum variator sheaves manually
to ensure proper engagement of the gears.
DE-AWNING PLATES -- Figures 46 and 47
De-awning plates increase the rubbing action of the
drum and concave when threshing winter barley or
difficult to thresh crops.
T wo de-awning plates M are attached to the concave
with hinges and can be locked in position with levers N
and P.
Lever N operates the front de-awning plate and lever
P operates the rear de-awning plate.
Only close the rear de-awning plate M if really neces-
sary, as partially closing off the concave inevitably
means loss of capacity.
42969
45
46
42964
47
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