MacDon CA25 OM - Manual (Page 72)

SECTION 7. OPERATION
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Revision B
7.9.4 Reel Speed
Reel speed affects feeding of crop into the
sickle and onto the drapers, as well as the
smoothness and evenness of the delivered
crop.
Operating the reel too fast or too slow relative
to ground speed will cause bunching. At the
proper speed, the reel discs should appear to
be being driven by the ground.
 If they look like they are skidding relative to
ground, the reel is turning too slow.
 If they look like they are spinning
excessively relative to the ground, reel
speed may be too fast.
In standing crop, reel speed should be just
faster than or equal to ground speed, sweeping
crop across the sickle.
Flattened crop or a crop that is leaning away
from the cutterbar requires a higher reel speed
in relation to ground speed. This can be
achieved by increasing reel speed, decreasing
ground speed, or both.
Excessive shattering of grain heads or crop loss
over the header back tube may be indications
that reel speed is too fast. Excessive reel speed
causes undue wear of reel components and
unnecessary load on reel drive, resulting in
uneven reel motion.
Generally, 9-bat reels can effectively operate at
lower reel speed, while minimizing crop loss in
shatter prone crops.
Refer to Section 7.8.1 Header Settings for
recommended reel speeds in specific crops and
crop conditions.
The reel speed is adjustable with the controls in
the combine cab. Refer to your Combine
Operator’s Manual for adjustment details.
7.9.4.1 Optional Reel Drive Sprockets
MACHINE
HYDRAULICS
COMBINE APPLICATION
DRIVE
SPROCKET
All All Standard 19 Tooth
2000–2100 psi
(13.79–14.48
MPa)
AGCO
Transverse
Rotary.
Combining
Down Rice
10 Tooth
2500 psi
(17.24 MPa)
CAT 500,
700 Series.
AGCO Axial
Rotary.
12 Tooth
3000 psi
(20.68 MPa)
NH CR, CX.
Case IH
7010, 8010,
7120, 8120,
88 Series.
14 Tooth
Low Flow
under 11 gpm
---
Combining
Light Crops
Above 10 mph
(16 km/hr)
21 Tooth
Sprockets are available as an option to the
factory installed sprocket. See your MacDon
Dealer Parts Department to order sprockets.
Refer to Section 8.12.5 Reel Drive Sprocket for
installation details.