MacDon FlexDraper FD1 Series Operator's Manual page 489

NOTE:
Belt guide removed for illustration purposes.
3. Loosen the two bolts (A) securing the motor assembly
to the header endsheet.
4. Check drive belt tension. A properly tensioned drive
belt (C) should deflect 24–28 mm (15/16–1-1/8 in.)
when 133 N (30 lbf) of force is applied at the midspan. If
the belt needs to be tensioned, turn the adjuster bolt (B)
clockwise to move the drive motor until proper tension
is set.
5. Ensure the clearance between belt (A) and belt
guide (B) is 1 mm (1/16 in.).
6. Loosen the three bolts (C), and adjust the position of
guide (B) as required.
7. Tighten the three bolts (C).
8. Close the endshield. Refer to
34.
NOTE:
Readjust the tension of a new belt after a short run-in
period (about 5 hours).
9. Double-knife headers only: Repeat procedure on the
other side of the header.
214683
MAINTENANCE AND SERVICING
Closing Endshields, page
465
C
Figure 5.138: Knife Drive
A
C
Figure 5.139: Knife Drive
B
A
B
Revision A