MacDon D60 Draper Headers - Manual (Page 102)

SECTION 8. MAINTENANCE AND SERVICING
Form 169441 100 Revision B
D
8.7.8 SICKLE DRIVE BELTS - NON-
TIMED DRIVE
This section applies to single knife headers, and
40 FT. double knife headers with non-timed
drives.
For double knife headers with timed drives, refer
to Section 8.7.9 Sickle Drive Belts - Timed Drive.
8.7.8.1 Tension Adjustment
IMPORTANT
To prolong belt and drive life, do not
over-tighten belt.
CAUTION
To avoid personal injury, before servicing
machine or opening drive covers, follow
procedures in Section 8.1 PREPARATION
FOR SERVICING.
a. Open/remove endshield.
b. Loosen two bolts (A) on sickle drive mounting
bracket.
c. Turn adjuster bolt (B) to move drive motor until a
force of 20 lbf (80 N) deflects belt (C) 3/4 in.
(18 mm) at mid-span.
d. Tighten jam-nut at (B), and bolts (A) on drive
mounting bracket.
e. Re-adjust tension of a new belt, after a short run-
in period, (about 5 hours).
8.7.8.2 Removal
a. Loosen sickle drive belt using procedure in
previous section so that belt (C) can be slipped
off drive pulley.
b. Remove bolt in plate
(D) in endsheet at
wobble box, and
remove the plate.
This provides
clearance between
the pulley and
endsheet for the belt
when it is removed.
c. Slip belt over and behind wobble box pulley (E),
and remove belt. Utilize the notch in the pulley to
assist in removing the belt.
8.7.8.3 Installation
a. Route sickle drive belt (C) around wobble box
pulley (E) and sickle drive pulley. Utilize the notch
in the pulley to assist in installing the belt.
NOTE
When installing new belt, never pry belt
over pulley. Be sure drive motor is fully
forward, then tension belt.
b. Tighten belt. Refer to Section 8.7.8.1 Tension
Adjustment.
c. Check clearance between belt (C) and belt guide
(F). The measurement should be 0.04 in.
(1 mm). Adjust as follows:
1. Ensure belt is properly tensioned.
2. Loosen bolts (G), and adjust position of guide
as required.
3. Tighten bolts.
d. Re-install plate (D) and secure with bolt and nut.
e. Re-install endshield.
LH SHOWN - RH OPPOSITE
E
C
F
G
B
A
C
LH SHOWN - RH OPPOSITE