SECTION 4 - MAINTENANCE
4-10
KNIFE REPLACEMENT
IMPORTANT: Inspect the cutter bar for leaks or other
needed repairs whenever performing service work
on the bar. If a leak is found, repair it immediately to
prevent future failures.
IMPORTANT: Always replace both knives on a disc
to maintain balance. Do not intermix old and new
knives on a disc.
1. Remove the dirt from the square of the knife bolt,
1.
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2. Block the discs in place with a prybar, 1.
3. Remove the bolt with a 1/2″ drive ratchet as
shown. Hold the nut in place from the bottom with
your hand. This will keep the nut from turning.
NOTE: If you are using an impact wrench, use a bar
to hold the nut in place, not your hand.
4. The knife and the nut can be removed from under
the disc after the bolt is removed.
5. Knives can be turned over to use the opposite
cutting edge after they become dull or nicked. All
knives are angled. Knives are referred to as
clockwise or counterclockwise depending on
which disc they are attached to.
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6. The leading edge of the knives must be lower
than the rear edge. Refer to the figure as to which
way the discs turn on each model. Note that on
a 615 and 617, the #1 and #2 discs both rotate in
the same direction (co-rotate); the remaining
discs counterrotate like the 616.
617
616
615
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