New Holland 499 Operator's Manual page 78

KNIFE SECTIONS, REPLACEMENT
Riveted Knife Assemblies
To replace a section on a riveted knife assembly, 1,
remove the rivets from the knife back. Support the
knife back when driving the rivets out of the knife
back. Special rivet removal and installation tools are
available to replace a section with the knife installed
in the machine. If the tool is not available, remove the
knife assembly to replace the section.
NOTE: To replace a section in the overlap or knife
head areas, remove the knife assembly from the
cutter bar.
Several different lengths round head knife section
rivets are required. The knife head and knife back
extension require longer rivets than those used for
the knife back. Special flat head rivets are also
required at the knife overlap area. Be sure to use the
correct type and length rivets when replacing a knife
section bolt.
The LH riveted single section overlap knife uses
thirty-one 21/32" long rivets, twelve 1" long rivets,
and six 9/16" long flat head rivets.
The RH riveted single section overlap knife uses
thirty 21/32" long rivets, six 15/16" long rivets, twelve
1" long rivets and three 1/2" long flat head rivets.
To remove a worn or damaged section, place the
knife assembly in a large vise with the section
between the jaws. Rest the knife back, 1, on a jaw. Do
not tighten the vise against the section. Use a large
hammer to strike the rear edge of the section to shear
the rivets. Remove the knife assembly from the vise.
SECTION 4 - MAINTENANCE
4-18
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1
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