MacDon A40-D Pull-Type - Manual (Page 138)

SECTION 7 MAINTENANCE AND SERVICING
169000
136
Revision F
7.8.12.3 Installing Knife Drive Box
a. Position knife drive box as shown, and install
four bolts (A). Torque side bolts, and then torque
bottom bolts to 200 ft·lbf (270 Nm).
IMPORTANT
Use only Grade L9 bolts and flat washers.
b. Apply Loctite
®
#243 adhesive (or equivalent) in
two bands (B) around shaft as shown, with one
band at end of shaft, and one band
approximately mid-way.
c. Slide pitman arm (C) onto knife drive box
output shaft.
d. Rotate knife drive box pulley to ensure pitman
arm just clears frame to ensure proper
placement on splines. Remove arm (C), and
reposition on splines as required.
e. Rotate knife drive box pulley to locate pitman
arm at furthest outboard position.
f. Slide arm (C) up or down on shaft until it just
contacts knife head (D) (0.010 in. [0.25 mm])
gap.
g. Install bolt (E) and nut, and torque to 160 ft·lbf
(217 N·m).
h. Align knife head (D) with pitman arm (C).
i. Install knife head pin (F) in pitman arm (C) and
tap it down into the knife head, ensuring pin is
bottomed out in the knife head.
j. Tap underside of the knife head until the pin is
flush with the upper face of the pitman arm (C).
k. Carefully adjust to achieve a 0.010 in. (.25 mm)
gap at (G) with the knife laying flat on the first
few guards.
l. Replace bolt (H) and nut.
m. Tighten nut to 160 ft·lbf (220 N·m).
n. Replace grease zerk (J) in pin.
o. Install drive belt onto knife drive box pulley and
tighten. Refer to one of the following sections,
depending on your equipment:
• Section 7.8.9.1 Adjusting Tension: LH Knife
Drive Timing Belt – A30-D
• Section 7.8.9.4 Adjusting Tension: RH Knife
Drive Timing Belt – A30-D
• Section 7.8.10.1 Adjusting Tension: LH
Knife Drive Belts – A40-D
• Section 7.8.10.4 Adjusting Tension: RH
Knife Drive Belt – A40-D
A
B
C
E
J
H
C
F
H
G
D