MacDon FD75 OM User Manual
Page 416

Symptom
Problem
Solution
Section
Reel too high or too far
forward
Lower reel or move reel
rearward
and
Ground speed to slow
Increase ground speed
Loose knife drive belt
Adjust drive belt tension
6.8.8 Knife Drive Belt, page
311
Improper knife hold-down
adjustment
Adjust hold-down
Dull or broken knife section
Replace knife section
6.8.1 Replacing Knife
Section, page 300
Bent or broken guards
Align or replace guards
Reel fingers not lifting crop
properly ahead of knife
Adjust reel position/finger
pitch
4.7.10 Reel Fore-Aft
Position, page 152
and
4.7.11 Reel Tine Pitch,
page 156
Steel pick-up fingers
contacting knife
Increase reel clearance to
cutterbar or adjust “frown”
6.12.1 Reel Clearance to
Cutterbar, page 348
and
Float too heavy
Adjust springs for lighter
float
Raise cutterbar by lowering
skid shoes
Install cut-out sections
See your MacDon Dealer
Mud or dirt build-up on
cutterbar
Flatten header angle
Knife plugging
Knife is not operating at
recommended speed
Check engine speed of
combine
See your MacDon Dealer
Knife hold-downs not
adjusted properly
Adjust hold-downs
Knife not operating at
recommended speed
Check engine speed of
combine
See your MacDon Dealer
Excessive knife wear
Replace knife
6.8.5 Installing Knife, page
303
Excessive header
vibration
Loose or worn knifehead
pin or drive arm
Tighten or replace parts
6.8.1 Replacing Knife
Section, page 300
Incorrect knife speed
Adjust knife speed
Driveline U-joints worn
Replace U-joints
—
Excessive vibration of
adapter and header
Bent cutterbar
Straighten cutterbar
See your MacDon Dealer
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Revision A