MacDon R85 Operator's Manual page 85

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. Refer to
73.
IMPORTANT:
Roll timing is critical when the roll gap is
decreased because the bars may contact each
other if the timing is wrong.
10. Refer to
6.4 Roll Timing, page 77
checking the timing.
11. Close the driveshield. Refer to
26.
169455
OPERATING THE HEADER
6.2.1 Checking Roll Gap, page
for instructions on
5.4 Driveshields, page
Figure 6.5: Roll Gap Adjustment Bolt
A - Upper Jam Nut
C - 0.78 in. (19 mm)
75
B - Lower Nut
Revision F