MacDon FD75 - Page 512

214323 494 Revision A
Symptom
Problem
Solution Refer to
Excessive vibration of
adapter and header
Incorrect knife speed Adjust knife speed 3.7.8 Knife Speed, page 82
Excessive vibration of
adapter and header
Driveline U-joints worn Replace U-joints
See your MacDon Dealer
Excessive vibration of
adapter and header
Bent cutterbar
Straighten cutterbar See your MacDon Dealer
Excessive breakage of
knife sections or guards
Knife hold-downs not
adjusted properly
Adjust hold-downs
Checking and Adjusting
Knife Hold-Downs, page
386
Excessive breakage of
knife sections or guards
Cutterbar operating too low
in stony conditions
Raise cutterbar, using
skid shoes
Cutting on the Ground,
page 56
Excessive breakage of
knife sections or guards
Float is set too heavy
Adjust float springs for
lighter float
3.7.2 Header Float, page
58
Excessive breakage of
knife sections or guards
Bent or broken guard
Straighten or replace guard
5.8.7 Knife Guards, page
380
Excessive breakage of
knife sections or guards
Header angle too steep Flatten header angle
3.7.4 Header Angle, page
76
Knife back breakage
Bent or broken guard
Straighten or replace guard
5.8.7 Knife Guards, page
380
Knife back breakage Worn knifehead pin Replace knifehead pin
• 5.8.3 Removing
Knifehead Bearing, page
378
• 5.8.4 Installing
Knifehead Bearing, page
379
Knife back breakage Dull knife Replace knife
• 5.8.2 Removing Knife,
page 377
• 5.8.5 Installing Knife,
page 379
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