214683 564 Revision A
7.2 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
• Adjusting Hold-Downs with
Pointed Guards, page 448
• Adjusting Hold-Downs with
Stub Guards, page 451
Knife sections or guards are worn or
broken
Replace all worn and broken cutting
parts
5.8 Knife, page 437
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
• 3.7.6 Reel Speed, page 89
• 3.7.7 Ground Speed, page 90
Reel fingers not lifting crop properly
ahead of knife
Adjust reel position/finger pitch
• 3.7.11 Reel Fore-Aft Position,
page 99
• 3.7.12 Reel Tine Pitch, page 111
Cutterbar too high
Lower cutting height
3.7.1 Cutting off the Ground, page
58 or 3.7.2 Cutting on the Ground,
page 62
Header angle too flat Steepen header angle
3.7.5 Header Angle, page 81
Bent knife causing binding of cutting
parts
Straighten bent knife and align
guards
5.8.7 Knife Guards, page 441
Cutting edge of guards not close
enough or parallel to knife sections
Align guards
5.8.7 Knife Guards, page 441
Tangled/tough-to-cut crop
Install stub guards
• See your MacDon Dealer
• Adjusting Hold-Downs with
Pointed Guards, page 448 or
Adjusting Hold-Downs with Stub
Guards, page 451
• 6.3.5 Stub Guard Conversion
Kit, page 550
Reel too far back Move reel forward
3.7.11 Reel Fore-Aft Position, page
99
Loose knife drive belt
Adjust drive belt tension
Checking and Tensioning Knife
Drive Belts, page 464
TROUBLESHOOTING
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