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. Open the driveshield. Refer to
30.
3. Loosen nuts (A) and slide conditioner shield (B) up to
remove it.
4. Measure the clearance (B) between the flats of the
conditioner roll bars at both end of the conditioner
rolls. Dimension (B) should be set to 9–13 mm
(0.35–0.51 in.). If adjustment is required, refer to
Adjusting Roll Timing, page
NOTE:
There should be less than 2 mm (0.08 in.)
difference between the two ends of the
conditioner roll.
NOTE:
Roll spacing not to scale in illustration.
5. Close the driveshield. Refer to
30.
214014
OPERATING THE HEADER
3.4 Driveshields, page
4.4.2
91.
3.4 Driveshields, page
90
Figure 4.9: Conditioner Shield (LH Side)
Figure 4.10: Roll Timing
A - Crop Flow
B - Roll Timing Distance 9–13 mm (0.35–0.51 in.)
Revision B