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6. Shut down the combine.
7. Compare pulley rpm measurement with the rpm values in the knife speed chart. Refer to 3.7.8 Knife Speed,
page 82.
8. Contact your MacDon Dealer if the pulley rpm measurement exceeds the specified rpm range for your header.
3.7.9 Reel Height
The crop type and condition determines the operating height of the reel.
Set the reel height to carry material past the knife and onto the drapers with minimal disturbance and damage to the
cut crop. Refer to 3.7.10 Reel Fore-Aft Position, page 84.
The reel height is controlled using switches in the combine cab.
Table 3.11 Reel Height
Crop Condition
Reel Position
Lodged rice
Lowered (also change reel speed and/or cam setting)
Bushy or heavy standing (all)
Raised
The following conditions might result if the reel is set too low:
• Crop loss over the header backtube
• Crop disturbance on the drapers caused by the reel fingers
• Crop being pushed down by the tine tubes
The following conditions might result if the reel is set too high:
• Cutterbar plugging
• Crop lodging and being left uncut
• Grain stalks dropping ahead of cutterbar
Refer to 3.6.2 Header Settings, page 42 to determine recommended reel heights for specific crops and
crop conditions.
IMPORTANT:
Maintain adequate clearance to prevent fingers contacting the knife or the ground. Refer to 5.13.1 Reel Clearance
to Cutterbar, page 436.
3.7.10 Reel Fore-Aft Position
Reel fore-aft position is a critical factor for achieving the best results in adverse conditions. The reel position is
factory-set for normal conditions, but it can be adjusted forwards or backwards as required using the controls inside
the cab.
The reel can be moved approximately 227 mm (9 in.) farther aft by repositioning the fore-aft cylinders on the reel
arms to accommodate certain crop conditions.
For double-reel headers, refer to Repositioning Fore-Aft Cylinders, page 85.
If the combine is equipped with the Multi-Crop Rapid Reel Conversion option, refer to Repositioning Fore-Aft
Cylinders with Multi-Crop Rapid Reel Conversion Option, page 89.
OPERATION
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