MacDon A40-D Pull-Type - Manual (Page 131)

SECTION 7 MAINTENANCE AND SERVICING
169000
129
Revision F
7.8.10 Knife Drive Belts: A40-D
7.8.10.1 Adjusting Tension: LH Knife Drive
Belts - A40-D
IMPORTANT
To prolong belt and drive life, do NOT
over-tighten belts.
Timing Belt
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. Open shield on LH side of the header.
b. Loosen three nuts (B), and jam nut on adjuster
bolt (C).
c. 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).
d. Tighten jam nut at (C), and three nuts (B).
e. Readjust tension of a new belt after a short
run-in period, (about 5 hours).
Double V-Belts
a. Loosen three nuts (F), and jam nut on adjuster
bolt (G).
b. Turn adjuster bolt (G) to move pulley (H) until a
force of 8–12 lbf (35–50 N) applied to each belt
at mid-span deflects each belt (E)
0.16 in. (4 mm).
c. Tighten jam nut at (G), and three nuts (F).
d. Close endshield.
e. Readjust tension of a new belt after a short
run-in period (about 5 hours).
7.8.10.2 Removing LH Knife Drive Belts - A40-D
Double V-Belts
a. Open shield on LH side of the header.
b. Loosen three nuts (F), and jam nut on adjuster
bolt (G).
c. Turn adjuster bolt (G) so that drive belts (E) can
be slipped off pulleys (D) and (H).
(continued next page)
C
D
A
B
E
H
G
F
E
H
G
F
D