MacDon R85 Rotary Disc 13 Foot Self-Propelled Windrower Header - Manual (Page 79)

OPERATING THE HEADER
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 6.2.1 Checking Roll Gap,
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 for instructions
on checking the timing.
11. Close the driveshield See Section 5.4 Driveshields,
page 28 .
Figure 6.5: Roll Gap Adjustment Bolt
A - Upper Jam Nut B - Lower Nut
C - 0.78 in. (19 mm)
169455
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Rev. E