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Honey Bee Manufacturing Ltd.
SDX Header
Page 83
20.5 - Drive Belt Tension
All drive belts should have proper tension and alignment. If any belts appear to be damaged, they must be
replaced and the cause of damage must be determined and rectified.
Fig. 105 - Drive Belt Locations
Left Draper Belt 1
Left Draper Belt 2
Right Draper Belt 1
Right Draper Belt 2
Right Hand Drive Belt
Center Draper Chain
Knife Belt
Feed Auger Drive Belt
New: 195-200 Hz
Used: 165-170 Hz
Tension as per instructions in
section 20.5.7 on page 91
60-70 Hz
New: 180-190 Hz
Used: 160-170 Hz
The belts shown above with a Hz measurement
must be checked with a device that can measure
sound frequency. Fortunately, most cell phones
can use guitar tuner apps for this measurement.
The remaining belts are tensioned using a
mechanical spring tensioner.
For both belt types, it is important that the tension
is measured and adjusted after the header has
been running for some time to ensure the belts
have reached their operational temperature.
Before adjusting belt tension, shut off the
combine, engage the parking brake and wait for
all moving parts to come to a stop before
approaching the header.
Do not tension ‘cold’ belts as they may change
size when heated during operation, resulting in
incorrectly tensioned belts.
Under-tensioned belts can slip, generating heat
which will shorten the belt lifespan and damage
cog pulleys!
Over-tensioning belts will result in belt stretching
and reduced bearing lifespan.
If belt tension is adjusted, it is important to re-
check the tension after a day of usage to ensure
all adjustments are secure.
When adjusting belt tension, check the belt for
fraying or cracks. Replace if necessary.
Check the belt tension after the first 100 hours
of operation.
Summary of Contents for AirFLEX SDX 225
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