New Holland 499 Operator's Manual page 72

SECTION 4 - MAINTENANCE
CUTTER BAR MAINTENANCE
DANGER
The header may fall rapidly if the hydraulic lift
system should fail. Always engage the lift
cylinder transport stops when working around
the raised header. Failure to use transport stops
may result in serious injury or death.
WARNING
Always wear protective safety glasses when
working on the cutter bar to protect your eyes
from metal chips, chaff, or dirt.
IMPORTANT: Many mower-conditioner problems
are caused by improper adjustment or poor
maintenance of the cutter bar.
CUTTER BAR
The cutter bar is like a pair of shears. The cutting
edges of the guards, 1, and knife sections, 2, must be
sharp and close together for smooth, clean cutting.
Shown is a cutter bar with standard guards. Optional
stub guards are available for use in difficult cutting
conditions. The stub guards do not protect the front
of the knife sections. The stub guards require sharp
1
2
knifes, frequent alignment and adjustment of the hold
down clips. Refer to the "Stub Guard" portion of
4837-16
Section 6, Optional Equipment, of this manual for
additional information.
IMPORTANT: Black, overserrated, fully-bolted knife
sections are original factory equipment on Model 499
mower-conditioners, serial number 539686 and
above. Below serial number 539686, black,
underserrated, riveted sections were original equip-
4
ment. Purchase parts from your New Holland dealer
3
to convert older machines to fully-bolted knife
assemblies.
Overserrated sections stay sharp longer than
smooth or underserrated sections and cause less
wear to cutting edges of guards. Resharpening will
remove the overserrations.
5 6
Underserrated sections can be resharpened, but do
not stay sharp as long and may cause faster guard
13
wear.
4-12