Roll Gap; Checking Roll Gap - MacDon R113 Operator's Manual

3.14 Roll Gap

The roll gap controls the degree to which crop is conditioned as it passes through the rolls. Roll gap is factory-set at
6 mm (1/4 in.) for steel rolls, and approximately 3 mm (1/8 in.) for polyurethane rolls.
Polyurethane rolls are better suited for crushing stems while providing reduced crimping and are recommended for
alfalfa, clover, legumes and similar crops. Correct conditioning of crops is achieved when 90% of the stems show
cracking, but no more than 5% of the leaves are damaged. Set roll gap to produce these results.
Steel rolls with a larger gap (up to 25 mm [1 in.]) may be desirable for thick stemmed cane-type crops; however, too
large a gap may cause feeding problems. Steel rolls are recommended for these types of situations.
Grass type crops may require less gap for proper feeding and conditioning.
IMPORTANT:
If using settings below the factory setting, visually inspect the roll gap.

3.14.1 Checking Roll Gap

DANGER
To avoid bodily injury or death from unexpected startup of machine, always stop engine and remove key
from ignition before leaving operator's seat for any reason.
1. Lower self-propelled disc header fully.
2. Stop engine and remove key from ignition.
3. Polyurethane Rolls: Insert a feeler gauge through the
inspection hole in the conditioner endsheet to check roll
gap on polyurethane roll conditioners. Factory setting is
3 mm (1/8 in.). If adjustments are required, refer to
3.14.2 Adjusting Roll Gap: Polyurethane Rolls, page
214077
OPERATION
85.
Figure 3.131: Polyurethane Roll Conditioner
84
Revision A