214323 427 Revision B
1. Shut down the engine, and remove the key from the ignition.
2. Open the endshield. For instructions, refer to Opening Endshield, page 33.
Figure 6.152: Untimed Knife Drive
3. Loosen two bolts (A) securing the motor assembly to the
header endsheet.
4. Turn adjuster bolt (B) clockwise to move the drive motor
until a force of 89 N (20 lbf) deflects belt (C) 20–25 mm
(3/4–1 in.) at the midspan.
5. Tighten bolts (A) and the jam nut on bolt (B).
Figure 6.153: Untimed Knife Drive
6. Ensure the clearance between belt (A) and belt guide (B) is
1 mm (1/32 in.).
7. Loosen three bolts (C), and adjust the position of guide (B)
as required.
8. Tighten three bolts (C).
9. Close the endshield. For instructions, refer to Closing
Endshield, page 34.
NOTE:
Readjust the tension of a new belt after a short run-in
period (about 5 hours).
10. Repeat the above steps for the opposite end on double-
knife headers.
MAINTENANCE AND SERVICING
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