MacDon 4000 Mower Conditioner - Manual (Page 30)

30
OPERATION
OPERATING VARIABLES (continued)
6. HEADER FLOTATION
Header flotation springs are normally set so 70 lbs.
force (311 N) is required to lift each end of the
header just off the ground.
In rough or stony conditions, it may be desirable to
change setting to 35-50 lbs. (156-222 N) to protect
cutting components.
NOTE: When float setting is light, it may be
necessary to use a slower ground speed to avoid
excessive bouncing and leaving a ragged cut.
To increase header flotation, which decreases the
force required to lift header:
a. Back jam nut (A) away from spring.
b. Turn adjuster bolt (B) further into spring to
increase flotation.
c. Tighten jam nut (A) against spring insert (C) to
secure the setting.
IMPORTANT: Float setting (or lifting force) must
be equal on both springs. Weight difference
between left and right ends requires different
spring lengths to achieve equal float at both ends.
Note that other operating variable adjustments
may affect float setting. Check the float and
readjust if necessary after adjusting reel position,
cutting height, or cutterbar angle. Also, if using a
tractor with drawbar height different than 16 inches
(406 mm), flotation will be affected. Adjust as
required.
HEADER FLOTATION ADJUSTMENT
B
A C