MacDon R85 Operator's Manual page 79

4. Loosen upper jam nut (A) on both sides of conditioner.
5. To increase roll gap (increase conditioning action), turn
lower nut (B) clockwise.
6. To decrease roll gap (reduce conditioning action), turn
lower nut (B) counterclockwise.
7. Measurement at (C) should be 0.75 in. (19 mm).
8. Once adjustment is complete, hold nut (A) and torque
jam nut (B) to 75 ft-lbf (102 N·m).
NOTE: When adjusting roll gap, be sure that the
thread protruding at the adjustment is
the same on both ends of the conditioner
rolls. This will achieve consistent
intermesh across the rolls.
9. Check roll gap, see Section
page 69.
IMPORTANT
Roll timing is critical when the roll gap is
decreased because the bars may contact each
other if the timing is wrong.
10. See Section 6.4 Roll Timing, page 73
on checking the timing.
11. Close the driveshield See Section
page 28.
169455
OPERATING THE HEADER
6.2.1 Checking Roll Gap,
for instructions
5.4 Driveshields,
71
Figure 6.5: Roll Gap Adjustment Bolt
A - Upper Jam Nut
C - 0.78 in. (19 mm)
B - Lower Nut
Rev. E