Macdon 4000 Mower Conditioner User Manual download pdf (Page 31)

OPERATION

OPERATING VARIABLES (continued)

7. ROLL GAP

WARNING: To avoid bodily injury or

death from unexpected start-up or

fall of raised machine; stop engine,

remove key and engage lift cylinder

stop before going under machine to

examine roll gap or for any other

reason.

Rubber rolls "condition" the crop by cracking the

stems, while steel rolls crimp the stem in several

places. Both methods allow moisture release for

quicker drying. The degree to which the crop is

conditioned as it passes through the rolls is

controlled by roll gap (A), measured from lug to

groove (or bar to roll tube). The gap is factory set

for normal operation at 1/16 inch (1.5 mm) for

rubber rolls and 3/8 inch (10 mm) for steel rolls.

Correct conditioning of alfalfa, clover and other

legumes is usually indicated when 90% of the

stems show cracking, but no more than 5% of the

leaves are damaged. Use only enough roll gap to

achieve this result.

A slightly larger gap may be desirable in thick

stemmed cane-type crops; however, too large a

gap will cause feeding problems.

Grass type crops may require less gap for proper

feeding.

To adjust roll gap:

a. Loosen nut (B) at both roll support arms.

NOTE: Use roll gap decal (D) to gauge your

adjustment. The decal marks roll gap in 1/8 inch (3

mm) increments. The bottom edge of inner

channel (E) is the gauge indicator.

b. To increase roll gap, turn nut (C) clockwise.

c. To decrease roll gap, turn nut (C) counter-

clockwise.

d. Tighten nut (B) to 160 ft.lbs. (210 N.m) at both

arms.

IMPORTANT: Gap settings must be equal at both

ends of roll. To avoid excessive crushing, do not

operate rubber rolls at less than 1/32 inch (1 mm)

gap.

NOTE: Roll tension (the force holding the rolls

together) is factory set and non-adjustable.

ROLL GAP ADJUSTMENT

ROLL GAP (RUBBER ROLLS SHOWN)

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Macdon 4000 Mower Conditioner User Manual Page 31

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