MacDon A40-D Pull-Type - Manual (Page 130)

SECTION 7 MAINTENANCE AND SERVICING
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128
Revision F
7.8.9.6 Installing RH Knife Drive Timing Belt -
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).
NOTE
When installing new belt, NEVER pry
belt over pulley. Be sure adjusting screw
is fully loosened, then tension belt.
b. Turn adjuster bolt (C) to move pulley (D) until a
force of 5–6.5 lbf (22–30 N) applied at mid-span
deflects belt (A) 0.55 in. (14 mm).
c. Tighten jam nut at (C), and three nuts (B).
d. Position V-belts (E) on pulleys.
e. Turn adjuster bolt (F) to move pulley (G) so that
each belt (E) deflects 3/16 in. (4 mm) when a
load of 8–12 lbf (35–40 N) is applied to each belt
at mid-span.
f. Tighten jam nut on adjuster bolt (F), and
nuts (H).
g. Install bolt-in plate in RH endsheet at knife
drive box.
h. Close endshield.
i. Readjust tension of a new belt after a short
run-in period (about 5 hours).
H
E
G
F
A
B
C
D
E