MacDon FD75 OM - Manual (Page 324)

MAINTENANCE AND SERVICING
Adjusting Hold-Downs with Pointed Guards
To adjust the clearance between hold-downs and knife on
header with pointed guards, follow these steps:
1. Check the clearance (A) between the normal
hold-down and knife section with a feeler gauge. The
clearance should be
• 0.004–0.024 in. (0.1–0.6 mm).
2. Adjust as required by turning bolt (B).
NOTE:
For larger adjustments, it may be necessary
to loosen nuts (C), turn adjuster bolt (B), then
retighten nuts (C).
Figure 6.108: Hold-Down Clearance
3. Check the clearances between the center guard
hold-down (A) and knife section with a feeler gauge.
The clearances should be:
• 0.004–0.016 in. (0.1–0.4 mm) at guide tip (B)
• 0.004–0.040 in. (0.1–1.0 mm) at rear of guide (C)
4. If required, adjust clearances as follows: .
a. Torque nuts (D) to 35 ft·lbf (46 N·m).
b. Turn the three adjuster bolts (E) as required.
c. Torque nuts (D) to 53 ft·lbf (72 N·m).
5. After adjusting all hold-downs, run header at a low
engine speed and listen for noise due to insufficient
clearance.
Insufficient clearance will also result
in overheating of the knife and guards. Re-adjust
as necessary.
Figure 6.109: Hold-Down Clearance
A - Hold-Down B - Clearance C - Clearance
D - Nuts E - Adjuster Bolt
169894 310 Revision A