Roll Timing; Checking Roll Timing - MacDon R85 Operator's Manual

4.4 Roll Timing

For proper conditioning, the rolls must be properly timed. Each steel bar on one of the rolls should be centered
between two bars of the other roll. The factory setting should be suitable for most crop conditions.
IMPORTANT:
Roll timing is especially critical when roll gap is decreased because the bars can contact each other if the
timing is wrong.

4.4.1 Checking Roll Timing

DANGER
To avoid bodily injury or death from unexpected startup of the machine, always stop the engine and remove
the key from the ignition before leaving the operator's seat for any reason.
1. Lower the header fully.
2. Stop the engine and remove the key.
3. Open the driveshield. Refer to
28.
4. Loosen nuts (B) and slide conditioner shield (A) up
to remove.
5. Measure the roll timing distance (B) at each end
of the rolls. Each steel bar on one roll should be
centered between two bars of the other roll so that the
distance (B) is approximately equal on both sides of
the bar.
6. If adjustment is required, refer to
Timing, page 80.
NOTE:
Roll spacing not to scale in illustration.
7. Close the driveshield. Refer to
28.
147757
OPERATING THE HEADER
3.4 Driveshields, page
4.4.2 Adjusting Roll
3.4 Driveshields, page
79
Figure 4.7: Conditioner Shield
Figure 4.8: Conditioner Roll Timing
A - Center Roll Bars B - Roll Timing Distance
Revision B