MacDon D65 Operator's Manual page 180

Tensioning Timed Knife Drive Belts
This describes the tensioning procedure for the timed left and right knife drive belts. The illustrations for the
right side are opposite to what is shown.
IMPORTANT:
To prolong belt and drive life, do NOT over-tighten belt.
IMPORTANT:
Do NOT use the adjuster bolt at the drive pulley to adjust timing belt tension.
1. Open left endshield. Refer to
page 37.
2. Loosen two nuts (A) on knife drive belt idler bracket.
3. 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:
A piece of wood (B) is placed under pry bar (A) to
protect paint.
169899
MAINTENANCE AND SERVICING
Opening Endshields,
168
Figure 6.85: Knife Drive
Figure 6.86: Knife Drive
Revision A