MacDon D65 Operator's Manual page 183

6. Rotate the idler pulley bracket (A) down and slide the
idler pulley up by hand to remove most of the belt slack.
Tighten nut (B).
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:
Place a piece of wood (B) under pry bar (A) to
protect paint.
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.
169899
MAINTENANCE AND SERVICING
Figure 6.92: Knife Drive: Right Side
Figure 6.93: Left Side Shown-Right Side
Opposite
Figure 6.94: Knife Drive: Right Side
171
Revision A