MacDon 742 HAY CONDITIONER - Manual (Page 67)

Form # 46290 Issue 09/05 65
MAINTENANCE/SERVICE
SICKLE AND SICKLE DRIVE (continued)
Converting Sickle Drive Assembly from Windrower to Combine - 21', 25', 30' & 36' Headers
The sickle drive assembly at the left end of the 21' to 36' header varies depending on the application
(windrower or combine). For kits to convert from one drive configuration to the other see “Options and
Attachments” section of this book.
Single Sickle Drive Belt Tension
Check sickle drive belt tension after a 5 hour run-in
period and every 100 hours thereafter.
IMPORTANT: To prolong belt and drive life, do not
over-tighten belt. Operate at minimum tension required
to prevent slipping or excessive belt whip. When
installing a new belt, never pry belt over pulley. Loosen
adjusting device sufficiently to allow easy installation.
To adjust:
1. Loosen nut (A).
2. Turn nut (B) to move idler pulley up or down
(depending on drive configuration) to tighten belt
until a force of 18 lbs. (80 N) deflects belt 3/4 inch
(20 mm) at mid-span.
3. Tighten nut (A).
4. Re-adjust tension of a new belt after a short run-in
period, (about 5 hours).
NOTE: To remove belt, back off idler pulley and
remove bolt-on panel in left end sheet at wobble box.
Turn belt on edge and work it up and over pulley hub
as shown.
A
B
SICKLE DRIVE BELT TENSION ADJUSTMENT
WINDROWER CONFIGURATION SHOWN
REMOVING SICKLE DRIVE BELT