MacDon 922 - Manual (Page 59)

Form # 46620 Issue 01/06 57
MAINTENANCE/SERVICE
HAY CONDITIONER
Hay Conditioner Drive Belt Tension
IMPORTANT: To prolong belt and drive life,
maintain correct belt tension.
When properly tensioned, coils on spring (C) must
be fully compressed. Check belt tension every 50
hours, or weekly.
To adjust:
1. Loosen rear nut (A) on adjuster.
2. Turn nut (B) clockwise until spring coils (C) are
compressed, then turn nut (B) an additional two
turns for proper tension.
3. Tighten nut (A) to lock the position.
NOTE: Nut (D) must not be over tightened as
assembly pivots at this point.
Replacing Hay Conditioner Drive Belts
It is not necessary to detach conditioner from
header to replace the belts. Proceed as follows:
1. Never pry belt over pulley.
2. Loosen nut (B). Turn nut (A) to fully loosen the
adjuster.
3. Apply rearward force on spring at (E), (pushing
with wrench works well) to "pop" spring off of
retaining nut. This allows full retraction of idler
for belt removal and installation.
NOTE: Removing the spring-loaded idler allows
easier belt removal and installation. If idler is
removed, take note of hardware positioning for
re-assembly.
4. To remove belt, loosen rear bolt (F) on link
between conditioner frame and gearbox.
Remove forward bolt (G) and pivot the link back
and out of the way. Pivot the gearbox back to
make sufficient clearance between header and
box for belt removal.
5. Remove bolt (H) at lower shield and pivot
shield down to allow removal of belt from lower
driven pulley.
6. Install belt, reassemble shield, link and idler
spring. Adjust belt tension as above.
7. Re-adjust belt tension after a short run-in
period, (about 5 hours).
D
E
A
C
B
HAY CONDITIONER DRIVE BELT
TENSION ADJUSTMENT
F
G
H
REMOVING / INSTALLING BELTS