MacDon D65 Operator's Manual page 172

7. Position pry bar (A) under the idler bracket (C), and
push the bracket up until a force of 6 lb (27 N) deflects
the belt 1/2 in. (13 mm) at mid-point of the upper span.
NOTE:
Placing a piece of wood (B) under pry bar (A) will
protect the paint of the machine.
8. Tighten nuts (C) to 54–59 ft·lbf (73–80 N·m) when
proper belt tension is achieved.
9. Check that the timing belts are properly seated in the
grooves on both driver and driven pulleys.
10. Check for correct knife timing by rotating the drive
slowly by hand and observe knives where they overlap
at the centre of the header.
IMPORTANT:
The knives must move in opposite directions and
begin moving at exactly the same time.
11. If the knives do not begin moving at the same time,
loosen the right side drive belt (B) just enough to allow
the belt to be repositioned to the next cog(s) and
proceed as follows:
a. If right knife 'leads' left knife, rotate RIGHT SIDE
driven pulley (A) clockwise.
b. If right knife 'lags' left knife, rotate RIGHT SIDE
driven pulley (A) counterclockwise.
12. Retension the right side drive belt as per above,
ensuring that the drive pulleys do not rotate.
IMPORTANT:
Do NOT use the adjuster bolt at the drive pulley to
adjust timing belt tension.
13. Recheck the timing.
14. Close both endshields. Refer to
page 36.
147725
MAINTENANCE AND SERVICING
Closing Endshields,
158
Figure 5.81: Left Side Shown-Right
Side Opposite
Figure 5.82
Revision A