Sickle Drive Belt Tension; Non-Timed Drive: Sk And Dk; Timed Drive: Dk - MacDon Harvest Header D65 Assembly Instructions Manual

D. SICKLE DRIVE BELT TENSION
IMPORTANT
To prolong belt and drive life, do not
over-tighten belt.
I.

NON-TIMED DRIVE: SK and DK

a. Open endshield.
b. A force of 20 lbf (80 N) should deflect belt (A)
3/4 in. (18 mm) at mid-span.
c. Only if necessary, adjust tension as follows:
A
LH SHOWN - RH OPPOSITE
1. Loosen two bolts (B) on sickle drive mounting
bracket, and jam-nut (C).
2. Turn adjuster bolt (D) to move drive motor
until tension is achieved.
3. Tighten jam nut (C), and bolts (B) on drive
mounting bracket.
d. Close endshield.
169603
PRE-DELIVERY INSPECTION
D
B
C
II. TIMED DRIVE: DK
a. Open endshield.
Timing Belts
LH SHOWN - RH OPPOSITE
a. A force of 6 lbf (27 N) should deflect timing belt
(E) 1/2 in. (13 mm) at mid-span.
b. Only if necessary, adjust tension as follows:
LH SHOWN - RH OPPOSITE
1. Loosen two nuts (F) on sickle drive belt idler
bracket.
2. Insert a long punch (or equivalent) into hole
(G) in idler bracket, and pry downward until a
force of 6 lbf (27 N) deflects timing belt 1/2 in.
(13 mm) at mid-span (E).
3. Tighten nuts (F) on idler mounting bracket.
29
F
G
(continued next page)
E
E
Revision B