214323
523
Revision B
8.2
Cutting Action and Knife Components
Problem
Solution
Refer to
Symptom: Ragged or uneven cutting of crop
Knife hold-downs not adjusted
properly
Adjust hold-downs
Checking and Adjusting Knife Hold-
Downs, page 410
Knife sections or guards are worn or
broken
Replace all worn and broken cutting
parts
Knife is not operating at
recommended speed
Check engine speed of combine
Refer to the combine operator
’
s
manual
Ground speed too fast for reel speed
Reduce ground speed or increase reel
speed
•
•
Reel fingers not lifting crop properly
ahead of knife
Adjust reel position/finger pitch
•
3.7.10 Reel Fore-Aft Position, page
90
•
3.7.11 Reel Tine Pitch, page 97
Cutterbar too high
Lower cutting height
Header angle too flat
Steepen header angle
Bent knife causing binding of cutting
parts
Straighten bent knife and align guards
Cutting edge of guards not close
enough or parallel to knife sections
Align guards
Tangled/tough-to-cut crop
Install stub guards
•
See your MacDon Dealer
•
•
7.3.3 Stub Guard Conversion Kit,
page 512
Reel too far back
Move reel forward
3.7.10 Reel Fore-Aft Position, page 90
Loose knife drive belt
Adjust drive belt tension
6.9.2 Knife Drive Belts, page 424
Symptom: Knife plugging
Reel too high or too far forward
Lower reel or move reel rearward
•
•
3.7.10 Reel Fore-Aft Position, page
90
Ground speed to slow
Increase ground speed
Loose knife drive belt
Adjust drive belt tension
6.9.2 Knife Drive Belts, page 424
Improper knife hold-down adjustment
Adjust hold-down
Checking and Adjusting Knife Hold-
Downs, page 410
Dull or broken knife section
Replace knife section
6.8.1 Replacing Knife Section, page
399
Bent or broken guards
Align or replace guards
Reel fingers not lifting crop properly
ahead of knife
Adjust reel position/ finger pitch
•
3.7.10 Reel Fore-Aft Position, page
90
•
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