MacDon A40-D, Operator'S Manual

Page: 154 / 240

214804
140
Revision A
4.8 Header Drive Systems
4.8.1 Header Knife Drive
The A40D and A40DX double-knife headers have a windrower-powered hydraulic motor that drives each knife on
the header with two belt-driven knife drive boxes.
Checking/Adjusting V-Belt Tension on Left Side
CAUTION
To avoid bodily injury or death from unexpected startup of machine, always stop engine and remove key
from ignition before leaving operator
’
s seat for any reason.
Figure 4.65: Left Side V-Belt
1. Turn off engine and remove key.
2. Open left endshield.
3. Apply a force of 35
–
50 N (8
–
12 lbf) on each belt at
midspan (D). Belt should deflect 4 mm (3/16 in.). If
necessary, adjust as follows:
a. Loosen three nuts (A), and jam nut on adjuster
bolt (B).
b. Turn adjuster bolt (B) to move pulley (C) to achieve
required deflection at (D).
c. Tighten jam nut at (B), and three nuts (A).
4. Close endshield.
NOTE:
Readjust tension of new belts after about 5 hours of
operation.
Removing Double V-Belts from Left Side
CAUTION
To avoid bodily injury or death from unexpected startup of machine, always stop engine and remove key
from ignition before leaving operator
’
s seat for any reason.
1. Turn off engine, and remove key.
2. Open left endshield.
MAINTENANCE AND SERVICING