Sickle Drive Timing Adjustment - MacDon A30-S Operator's Manual

7.8.12 Sickle Drive Timing Adjustment

Double knife A30-D and A40-D Auger Headers
require that the sickles are properly timed to
move in opposite directions.
CAUTION
Stop engine, and remove key from ignition
before leaving Operator's seat for any
reason. A child or even a pet could engage
an idling machine.
a. Remove the right side sickle drive belt. Refer to
Section 7.8.10.5 Removal: RH Sickle Drive
Timing Belt: - A30-D, or Section 7.8.11.5
Removal: RH Sickle Drive Belt - A40-D.
A
b. Rotate LH side wobble box driven pulley (A)
clockwise until LH side sickle (B) is at the center
of the inboard stoke (moving towards center of
header).
DIRECTION OF
LEFT
MOVEMENT
SICKLE
SECTIONS CENTERED
BETWEEN GUARDS
B
Center stroke
sections are centered between guard
points as shown.
Form 169000 / 169040
SECTION 7 MAINTENANCE AND SERVICING
RIGHT
SICKLE
D
NOTE
is when the sickle
c. Rotate right side wobble box pulley (C) counter
clockwise until right side sickle (D) is at the
center of the inboard stroke.
d. Install right side wobble box drive belt and
tension. Refer to Section 7.8.10.6 Installation:
RH Sickle Drive Belt - A30-D, or 7.8.11.6
Installation: RH Sickle Drive Belt - A40-D.
To maintain timing, wobble box driver and
driven pulleys must not rotate as the belt
is tightened.
e. Check that timing belts are properly seated in
the grooves on both driver and driven pulleys.
F
f. Check for correct sickle timing by rotating
driveshaft (E) slowly with the unplug wrench (F),
and observe sickles where they overlap at the
center of the header.
Sickles must move in opposite directions,
and must begin moving at exactly the
same time.
140
C
IMPORTANT
IMPORTANT
(continued next page)
E
Revision D