215651 153 Revision B
Figure 5.61: Knifehead
13. Install grease fitting (A) into the knifehead pin, and turn the
grease fitting for easy access.
14. Slowly apply grease to the knifehead until a slight
downward movement of the knifehead is observed.
IMPORTANT:
Do NOT overgrease the knifehead. Overgreasing leads to
knife misalignment causing excessive heating of guards and
overloading of drive systems. If overgreasing occurs,
remove the grease fitting to release pressure.
15. Check the alignment of the knife drive box pulley and the
drive pulley. If pulleys require adjustment, contact your
MacDon Dealer.
Figure 5.62: Knife Drive Box
16. Tighten the knife drive box side bolts (A) first, then tighten
bottom bolts (B). Torque to 271 Nm (200 lbf·ft).
17. Move the output arm to the mid-stroke position, and
ensure the knife bar doesn’t contact the front of the first
guard. If the knife drive box requires adjustment, contact
your MacDon Dealer.
18. Install and tension the knife drive belts.
• For untimed headers, refer to Checking and Tensioning
Untimed Double-Knife Drive Belts, page 160.
• For timed double-knife headers, refer to Tensioning
Timed Double-Knife Drive Belts, page 167.
• For timed double-knife headers, also check the knife
timing. For instructions, refer to Adjusting Timed
Double-Knife Timing, page 169.
19. Close the endshield. For instructions, refer to Closing
Endshields, page 38 .
Adjusting Knife Drive Box Squareness
To avoid damaging the knifehead, the knife drive box should be adjusted properly.
DANGER
To prevent bodily injury or death from the unexpected start-up of the machine, always stop the engine and remove the
key before making adjustments to the machine.
1. Shut down the engine, and remove the key from the ignition.
2. Open the required endshield(s). For instructions, refer to Opening Endshields, page 37.
MAINTENANCE AND SERVICING
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