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FIELD OPERATION
KILL-STALL
The only way to accurately check the performance of
the combine is to complete a ''kill-stall''.
1. Operate the combine in a section of the field that
best represents the overall crop. Be sure the
combine is at least 100 m into the crop and travel-
ling at the normal operating ground speed.
2. Press the top part of the engine reset switch 51
(section 2, Fig.10), apply the brakes gently and
allow the complete combine to stop. This will
leave crop material as it was during actual har-
vesting.
3. Disengage the threshing and header engage-
ment system clutch, move the hydrostatic speed
control lever to neutral, move the throttle control
to the low position and restart the engine immedi-
ately. This prevents the engine from overheating
and from being damaged. Allow the engine to
slow idle for five minutes before stopping the en-
gine.
4. Check the grain tank sample for complete thresh-
ing, cleanliness and damage.
5. Walk out in front of the header and check the crop
loss before the header has contacted the crop
(preharvest loss).
6. Check the crop loss in an area where only the
header has travelled (header loss).
7. Check the distribution of material on the grain
pan.
8. Check the type, amount and distribution of mate-
rial on the sieves.
9. Check the type and amount of returns.
10. Check the total loss in a 60 cm wide area across
the width of the cleaning shoe. Subtract prehar-
vest and header losses to determine the machine
loss.
Use a drop screen to check the machine loss di-
rectly.
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COMBINE PERFORMANCE CHECKS
11. With all previous factors considered, readjust the
combine.
NOTE:
Make only one adjustment at a time so that any
change in combine performance can be
attributed to that particular adjustment.
PERFORMANCE INDICATORS
There are four indicators which will tell you how well
the combine is performing. These four indicators are:
S Grain tank sample
S Distribution of material on the grain pan and upper
sieve
S Type and amount of returns
S Losses
By correctly reading these indicators and being famil-
iar with the combine, you can make the necessary ad-
justments to correct any problem and improve the
overall combine performance.
GRAIN TANK SAMPLE
A large amount of trash in the grain tank indicates the
crop is being overthreshed and/or the cleaning fan
speed is too slow. The first step to correct this prob-
lem is to increase the concave clearance and/or re-
duce drum speed. This reduces or eliminates the ma-
terial break-up caused by overthreshing. Then in-
crease the cleaning fan speed if the trash is heavier
than the grain or close the upper sieve if the trash is
larger than the grain.
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