MacDon A40-D Pull-Type - Manual (Page 128)

SECTION 7 MAINTENANCE AND SERVICING
169000
126
Revision F
7.8.9.3 Installing LH Knife Drive Belts:
A30-D
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. Route knife drive belt (A) through opening in
endsheet onto knife drive box pulley and knife
drive pulley (D) as shown.
NOTE
When installing new belt, NEVER pry
belt over pulley. Be sure idler is fully
loosened, then tension belt.
IMPORTANT
To prolong belt and drive life, do NOT
over-tighten belts.
b. Turn adjuster bolt (C) to move pulley (D) until a
force of 5–6.5 lbf (22–30 N) deflects belt (A)
0.55 in. (14 mm) at mid-span.
c. Tighten jam nut at (C), and three nuts (B).
d. Re-position V-belts (K) on pulley (D).
e. Turn adjuster bolt (J) to move drive pulley until a
force of 8–12 lbf (35–50 N) applied at mid-span
on each belt (K) deflects each belt
0.16 in. (4 mm).
f. Tighten jam nut at (J), and three nuts (H).
g. Reposition chain on large sprocket (G).
h. Turn adjuster bolt (F) to tighten chain to give
0.2 in. (5 mm) slack at mid-span. Tighten nut (E)
on idler sprocket.
i. Rotate auger and check chain for slack at
tightest point. Readjust position of idler sprocket
to achieve required slack.
j. Install bolt-in plate in LH endsheet at knife drive
box, and close endshield.
k. Readjust tension of a new belt after a short
run-in period (about 5 hours).
E
F
B
C
A
D
K D
H
J
G