MacDon D60 Draper Headers - Manual (Page 107)

SECTION 8. MAINTENANCE AND SERVICING
Form 169441 105 Revision B
8.7.9.3 Sickle Drive Timing
Double knife D60 Harvest Headers 35 FT. and
smaller require that the sickles are properly timed
to move in opposite directions.
To adjust the sickle timing, proceed as follows:
a. Remove the right sickle drive belt. Refer to
Section 8.7.9.2.2 Removal - Right End Timing
Belt.
b. Rotate the left wobble box driven pulley (A)
clockwise until the left sickle (B) is at the center of
the inboard stoke (moving towards center of
header).
NOTE
Center stroke is when the sickle
sections are centered between guard
points as shown.
c. Rotate the right wobble box pulley (C) counter
clockwise until the right sickle (D) is at the center
of the inboard stroke.
d. Install the right wobble box drive belt, and adjust
tension. Refer to Section 8.7.9.2.3 Installation -
Right End Timing Belt.
IMPORTANT
To maintain timing, wobble box driver
and driven pulleys must not rotate as
the belt is tightened.
e. Check that the timing belts are properly seated in
the grooves on both driver and driven pulleys.
f. Check for correct sickle timing by rotating the
drive slowly by hand, and observe sickles where
they overlap at the center of the header.
IMPORTANT
Sickles must move in opposite
directions, and must begin moving at
exactly the same time.
If timing is off, proceed as follows:
1. Loosen right belt sufficiently to allow skipping
the belt one or more teeth as required. Refer
to Section 8.7.9.2.1 Tension Adjustment -
Timing Belt.
2. If right sickle “leads” left sickle, rotate RIGHT
SIDE driven pulley (C) clockwise.
3. If right sickle “lags” left sickle, rotate RIGHT
SIDE driven pulley (C) counter clockwise.
4. Tighten right belt.
RIGHT
SICKLE
LEFT
SICKLE
DIRECTION OF
MOVEMENT
SECTIONS CENTERED
BETWEEN GUARDS
B
D
A
RIGHT
SICKLE
LEFT
SICKLE
DIRECTION OF
MOVEMENT
SECTIONS CENTERED
BETWEEN GUARDS
B
D
C