MacDon FD75 - Page 511

214323 493 Revision A
Symptom
Problem
Solution Refer to
Knife plugging Ground speed to slow
Increase ground speed
3.7.6 Ground Speed, page
80
Knife plugging Loose knife drive belt
Adjust drive belt tension
5.9.2 Knife Drive Belts,
page 400
Knife plugging
Improper knife hold-down
adjustment
Adjust hold-down
Checking and Adjusting
Knife Hold-Downs, page
386
Knife plugging Dull or broken knife section Replace knife section
5.8.1 Replacing Knife
Section, page 376
Knife plugging
Bent or broken guards Align or replace guards
5.8.7 Knife Guards, page
380
Knife plugging
Reel fingers not lifting crop
properly ahead of knife
Adjust reel position/
finger pitch
• 3.7.10 Reel Fore-Aft
Position, page 84
• 3.7.11 Reel Tine Pitch,
page 91
Knife plugging
Steel pick-up fingers
contacting knife
Increase reel clearance to
cutterbar or adjust “frown”
• 5.13.1 Reel Clearance
to Cutterbar, page 436
• 5.13.2 Reel Frown,
page 439
Knife plugging
Float too heavy
Adjust springs for
lighter float
3.7.2 Header Float, page
58
Knife plugging
Mud or dirt build-up
on cutterbar
Raise cutterbar by lowering
skid shoes
Cutting on the Ground,
page 56
Knife plugging
Mud or dirt build-up
on cutterbar
Install cut-out sections
Installing Knifehead Shield,
page 392
Knife plugging
Mud or dirt build-up
on cutterbar
Flatten header angle
3.7.4 Header Angle, page
76
Knife plugging
Knife is not operating at
recommended speed
Check engine speed
of combine
Refer to combine
operator’s manual
Excessive header
vibration
Knife hold-downs not
adjusted properly
Adjust hold-downs
Checking and Adjusting
Knife Hold-Downs, page
386
Excessive header
vibration
Knife not operating at
recommended speed
Check engine speed
of combine
Refer to combine
operator’s manual
Excessive header
vibration
Excessive knife wear Replace knife
• 5.8.2 Removing Knife,
page 377
• 5.8.5 Installing Knife,
page 379
Excessive header
vibration
Loose or worn knifehead
pin or drive arm
Tighten or replace parts
5.8.1 Replacing Knife
Section, page 376
TROUBLESHOOTING