MacDon FD75 OM - Manual (Page 327)

MAINTENANCE AND SERVICING
3. Reinstall the access cover (A) and secure it with bolt.
4. Close endshield. Refer to Closing Endshields, page
36 .
Figure 6.115: Access Cover
Tensioning Knife Drive Belts
.
IMPORTANT:
To prolong belt and drive life, do not overtighten belt.
1. Open endshield. Refer to Opening Endshields, page
35 .
2. Loosen the two bolts (A) that secure the motor
assembly to header endsheet.
3. Turn adjuster bolt (B) clockwise to move the drive
motor until a force of 20 lbf (80 N) deflects belt (C) 3/4
in. (18 mm) at mid-span.
Figure 6.116: Knife Drive
4. Check clearance between belt (A) and belt guide (B).
It should be 0.04 in. (1 mm).
5. Loosen three bolts (C) and adjust position of guide (B)
as required.
6. Tighten bolts (C).
7. Close endshield. Refer to Closing Endshields, page
36 .
8. Readjust tension of a new belt after a short run-in
period (about 5 hours).
Figure 6.117: Knife Drive
169894 313 Revision A