New Holland 499 Operator's Manual page 90

SICKLE DRIVE ADJUSTMENT
WARNING
Disengage the PTO, turn off the tractor engine
and remove the key. Wait for all movement to
stop before leaving the operator's position.
Never adjust, lubricate, clean or unplug machine
with the engine running. Failure to comply could
result in death or serious injury.
1. Upper rocker arm bolt
2. Rocker arm (2)
3. Hardened washer,
0.135" thick x 33/64" ID x 1" OD (4)
4. Hardened washer,
0.105" thick x 13/22" ID x 1" OD (2)
To adjust knife head-to-guard clearance:
1. Turn the conditioner rolls so the knife is at the
center of its stroke.
2. Loosen bolt, 1, at the top of the rocker arms, 2.
3. Move the rocker arms up or down until
knife-to-guard clearance is correct.
4. Tighten bolt, 1.
The knife back bar should be centered in the opening
in the guard. If the back bar rubs the guard, the knife
head bushing will be overloaded and may fail.
If the front or back edge of the knife back bar rubs the
guards:
1. Loosen the two guard bolts. Hold the guard
against the front of the cutter bar while tightening
the guard bolts.
2. Remove the knife assembly. Straighten the knife
head and back bar.
3. If the knife head bushing is not centered (front to
back) in the knife head, use a large vise and
15/16" socket to move the bushing.
NOTE: Do not press against the inner sleeve of the
bushing.
If the knife back bar still rubs the guards, rearrange
the shim washers on the sickle drive crank pin, so the
knife back is centered in the guards by:
SECTION 4 - MAINTENANCE
Knife sections should be 0.08 mm-0.8 mm
(0.003"-0.030") above the ledger surface of the
guards.
10004728
4-30
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