New Holland 499 Operator's Manual page 77

NOTE: The Model 499 uses two counterstroking
knife assemblies that overlap at the center of the
cutter bar. The overlap areas must be smooth. The
overlap areas of the knives require special knife
sections, installation hardware and a special center
guard.
IMPORTANT: Left and right are determined by
standing behind the machine and facing in the
direction of travel. Left and right are reversed if you
are standing in front of the machine and looking
toward the cutter bar.
The model 499 is equipped with one of three (3)
styles of knife assemblies shown. Determine the
knife style on your machine before servicing the
knife assembly. The three styles are:
- - Riveted knife assemblies with a single
overlap section.
- - bolted knife assemblies with a single overlap
section.
- - bolted knife assemblies with two overlap
sections.
NOTE: Machines above serial number 590275 are
equipped with the bolted knifes(c) with two overlap
sections. These knife assemblies can be used to
replace bolted(b) knifes with a single overlap section
by also replacing the special center guard. They can
be used to replace riveted(a) knifes by replacing the
special center guard and the hold down clips.
When replacing knife sections, refer to the drawing
for the knife on your machine.
SECTION 4 - MAINTENANCE
Riveted(A) or Bolted (B) Knives With a Single
Overlap Section
The riveted and bolted knives use the same knife
sections.
The right knife assemblies require two bottom
countersunk sections, 1. A knife back extension, 2,
is also installed on the right knife. The extension
holds the last knife section and also rides on the end
of the left knife.
The left knife assemblies require two top counter-
sunk sections, 3, and one bottom countersunk
section, 4. The bottom countersunk section on the
left knife is the same section as used on the right
knife, however it is installed with the bevel down.
The countersunk sections require flat head rivets or
bolts. Install the nuts on bolts in the overlap area with
the beveled side of the nut against the knife back.
Bolted Knives(C) With Two Overlap Sections
The right knife assembly requires three bottom
countersunk sections, 5. A knife back extension, 6,
is also installed on the right knife. The extension
holds the last three knife sections.
The left knife assembly requires one top counter-
sunk section, 7, and one special "Tomahawk"
section, 8, that is installed with the bevel down.
4-17