MacDon R85, Operator'S Manual

Page: 91 / 188

OPERATING THE HEADER
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
3.4 Driveshields, page
28
.
4. Loosen nuts (B) and slide conditioner shield (A) up
to remove.
Figure 4.7: Conditioner Shield
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
4.4.2 Adjusting Roll
Timing, page 80
.
NOTE:
Roll spacing not to scale in illustration.
7. Close the driveshield. Refer to
3.4 Driveshields, page
28
.
Figure 4.8: Conditioner Roll Timing
A - Center Roll Bars B - Roll Timing Distance
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Revision B