SECTION 4
4-41
CLEANING FAN
The cleaning fan speed can be adjusted electrically
from the operator’s platform and can be read from the
InfoView monitor.
Change the fan rpm only when the machine is run-
ning and adjust it to suit the nature of the crop, chaff
load and moisture content. A grass seed variator kit
can be installed to obtain a lower fan speed regulation
when threshing small seeds
An insufficient air blast will reduce the ‘‘clean area’’ of
the top sieve causing a dirty sample or grain loss
(grain will shake over the end of the shaker shoe).
The best way to check whether the volume of air is
satisfactory is to complete a ‘‘kill-stall’ ’, i.e. stopping
the engine with the threshing mechanism engaged
and checking the sieve coverage pattern.
Refer to paragraph headed ‘‘Combine performance
checks’’.
If this method of checking is used:
S The two rakes must be clean while the sieves
must be evenly loaded. Little or no grain should
be found on the rear part of the upper sieve.
S If the whole sieve is clear of grain and chaff, the
volume of air is too high. The grain will be blown
out of the machine and clean grain will be
transported over the lower sieve into the re-
turns cross auger.
S If the upper sieve is full of grain, the volume of
air is too low, so that the wind does not blow
through the chaff. Therefore grain will be
shaken off the sieve together with the chaff.
Sieve operation can also be checked by collecting
material coming from the rear of the cleaning shoe
and checking the sample for grain loss.
IMPORTANT:
Do not remove or modify the cleaning fan
guards as changes may influence the air flow in
an unfavourable way.
To Next Page
Loading...
Need help?
General
